[Monetdb-developers] [Monetdb-checkins] MonetDB/src/gdk gdk.mx, , 1.279, 1.280 gdk_atoms.mx, , 1.161, 1.162 gdk_bat.mx, , 1.214, 1.215 gdk_batop.mx, , 1.170, 1.171 gdk_bbp.mx, , 1.252, 1.253 gdk_heap.mx, , 1.117, 1.118 gdk_qsort.mx, , 1.34, 1.35 gdk_ssort.mx, , 1.15, 1...

Peter Boncz P.Boncz at cwi.nl
Tue Apr 14 14:04:36 CEST 2009


Hi Sjoerd,

Thanks for the question. I wrote earlier last night an email to this list, which
I thought covers this.

The answer regarding backward compatibility is:
(1) NO, on repositories created by MonetDB configures with --enable-bits=64
--enable-oid32
(2) YES, in all other cases.

It is my understanding that few people use (1). If the MonetDB team agrees, I
would propose not to take additional migration measures. If otherwise, ie if we
go to a migration anyway, we might also consider changing the new type stridx_t
in the (2) cases from var_t to unsigned short. It reduces the fixed overhead of
string heaps of small bats (2KB instead of 4KB on 32-bits, 8KB on 64 bits). I
refrained from doing so to keep (2) backward compatible.

Peter

> -----Original Message-----
> From: Sjoerd Mullender [mailto:sjoerd at acm.org]
> Sent: Tuesday, April 14, 2009 1:41 PM
> To: monetdb-developers at lists.sourceforge.net
> Cc: monetdb-checkins at lists.sourceforge.net
> Subject: Re: [Monetdb-checkins] MonetDB/src/gdk gdk.mx, , 1.279, 1.280
> gdk_atoms.mx, , 1.161, 1.162 gdk_bat.mx, , 1.214, 1.215 gdk_batop.mx, ,
> 1.170, 1.171 gdk_bbp.mx, , 1.252, 1.253 gdk_heap.mx, , 1.117, 1.118
> gdk_qsort.mx, , 1.34, 1.35 gdk_ssort.mx, , 1.15, 1...
> 
> Is this a backward compatible change?  In other words, can databases
> created before this change be read by the new version?
> 
> I really want backward compatibility, so if it isn't, some kind of
> conversion would be needed.
> 
> Peter Boncz wrote:
> > Update of /cvsroot/monetdb/MonetDB/src/gdk
> > In directory 23jxhf1.ch3.sourceforge.com:/tmp/cvs-serv5363/src/gdk
> >
> > Modified Files:
> > 	gdk.mx gdk_atoms.mx gdk_bat.mx gdk_batop.mx gdk_bbp.mx
> > 	gdk_heap.mx gdk_qsort.mx gdk_ssort.mx gdk_utils.mx
> > Log Message:
> > support for 32GB string heaps in 64bits/oid32 mode
> > (implies bat format change but ONLY for 64bits/oid32)
> >
> > src/gdk/gdk.mx
> > - introduce GDK_VARSHIFT, var_t (str indices) are to be shifted that
> >   amount of bits to get to the real offset (padding is 8, in case
> >   of 64-bits and oid32 -- otherwise it is 0 => no change)
> > - clean up usage of var_t in HEAP_* interface
> >
> > src/gdk/gdk_atoms.mx
> > - str heaps with difficult double lim distrubution do not maintain
> >   a linked list (direct open hashing only)
> > - allow internal string heap hash table pointers to be unsigned shorts
> >   instead of var_t (only switched on for 64bits/oid32)
> > - double-elim string heaps scaled back to 64KB (from 256-512KB)
> > - support for GDK_VARSHIFT
> >
> > src/gdk/gdk_bat.mx
> > - bugfix in 64bits/oid32 offset calculation (precision loss averted)
> >
> > src/gdk/gdk_batop.mx
> > src/gdk/gdk_bbp.mx
> > src/gdk/gdk_qsort.mx
> > src/gdk/gdk_ssort.mx
> > - support for GDK_VARSHIFT
> >
> > src/gdk/gdk_heap.mx
> > - HEAPmargin allocates large VM area after a block alloc in 64-bits
> >   (this to stimulate in-place HEAPextend without memcpy)
> > - clean up use of var_t/size_t in HEAP_* functions, and support for
> GDK_VARSHIFT
> >
> > src/gdk/gdk_utils.mx
> > - increase VM size for 64-bits systems to 4TB
> >
> >
> >
> > U gdk.mx
> > Index: gdk.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk.mx,v
> > retrieving revision 1.279
> > retrieving revision 1.280
> > diff -u -d -r1.279 -r1.280
> > --- gdk.mx	3 Apr 2009 09:14:51 -0000	1.279
> > +++ gdk.mx	13 Apr 2009 23:36:24 -0000	1.280
> > @@ -1068,9 +1068,9 @@
> >  @item void
> >  HEAP_destroy     (Heap* h)
> >  @item var_t
> > -HEAP_malloc      (Heap* heap, var_t nbytes)
> > +HEAP_malloc      (Heap* heap, size_t nbytes)
> >  @item void
> > -HEAP_free        (Heap *heap, size_t block)
> > +HEAP_free        (Heap *heap, var_t block)
> >  @item int
> >  HEAP_private     (Heap* h)
> >  @item void
> > @@ -1111,7 +1111,7 @@
> >  					int (*sizefcn) (ptr) /*
BATatoms[].atomLen
> function */
> >      );
> >
> > -gdk_export var_t HEAP_malloc(Heap *heap, var_t nbytes);
> > +gdk_export var_t HEAP_malloc(Heap *heap, size_t nbytes);
> >  gdk_export void HEAP_free(Heap *heap, var_t block);
> >  gdk_export var_t HEAP_private(Heap *h);
> >  gdk_export void HEAP_checkformat(Heap *h);
> > @@ -1350,12 +1350,37 @@
> >  #define Hloc(b,p)	((b)->H->heap.base+((p)<<(b)->H->shift))
> >  #define Tloc(b,p)	((b)->T->heap.base+((p)<<(b)->T->shift))
> >
> > +#if SIZEOF_VAR_T < SIZEOF_VOID_P
> > +/* NEW 11/4/2009: when compiled with 32-bits oids/var_t on 64-bits
> systems, align heap strings
> > + * on 8 byte boundaries always (wasting 4 padding bytes on avg). Note
> that in heaps where
> > + * duplicate elimination is succesful, such padding occurs anyway (as an
> aside, a better
> > + * implementation with two-bytes pointers in the string heap hash table,
> could reduce that
> > + * padding to avg 1 byte wasted -- see TODO below).
> > + *
> > + * This 8 byte alignment allows the offset in the fixed part of the BAT
> string column to be
> > + * interpreted as an index, which should be multiplied by 8 to get the
> position (VARSHIFT). The
> > + * overall effect is that 32GB heaps can be addressed even when oids are
> limited to 4Gtuples.
> > + *
> > + * In the future, we might extend this such that the string alignment is
> set in the BAT header
> > + * (columns with long strings take more storage space, but could
> tolerate more padding).
> > + * It would mostly work, only the sort routine and strPut/strLocate
> (which do not see the BAT
> > + * header) extra parameters would be needed in their APIs.
> > + */
> > +typedef unsigned short stridx_t;
> > +#define GDK_VARSHIFT 3
> > +#define GDK_VARALIGN (1<<GDK_VARSHIFT)
> > +#else
> > +typedef var_t stridx_t; /* TODO: should also be unsigned short, but kept
> at var_t not to break BAT images */
> > +#define GDK_VARSHIFT 0
> > +#define GDK_VARALIGN sizeof(stridx_t)
> > +#endif
> > +
> >  #define BUNhloc(bi,p)	Hloc((bi).b,p)
> >  #define BUNtloc(bi,p)	Tloc((bi).b,p)
> >  #define BUNhpos(bi,p)	(Hpos(&(bi),p))
> >  #define BUNtpos(bi,p)	(Tpos(&(bi),p))
> > -#define BUNhvar(bi,p)	((bi).b-
> >htype?(Hbase((bi).b)+*((var_t*)BUNhloc(bi,p))):BUNhpos(bi,p))
> > -#define BUNtvar(bi,p)	((bi).b-
> >ttype?(Tbase((bi).b)+*((var_t*)BUNtloc(bi,p))):BUNtpos(bi,p))
> > +#define BUNhvar(bi,p)	((bi).b-
> >htype?(Hbase((bi).b)+((*(var_t*)BUNhloc(bi,p))<<GDK_VARSHIFT)):BUNhpos(bi,
> p))
> > +#define BUNtvar(bi,p)	((bi).b-
> >ttype?(Tbase((bi).b)+((*(var_t*)BUNtloc(bi,p))<<GDK_VARSHIFT)):BUNtpos(bi,
> p))
> >  #define BUNhead(bi,p)	((bi).b-
> >hvarsized?BUNhvar(bi,p):BUNhloc(bi,p))
> >  #define BUNtail(bi,p)	((bi).b-
> >tvarsized?BUNtvar(bi,p):BUNtloc(bi,p))
> >
> >
> > U gdk_atoms.mx
> > Index: gdk_atoms.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_atoms.mx,v
> > retrieving revision 1.161
> > retrieving revision 1.162
> > diff -u -d -r1.161 -r1.162
> > --- gdk_atoms.mx	7 Apr 2009 11:53:22 -0000	1.161
> > +++ gdk_atoms.mx	13 Apr 2009 23:36:24 -0000	1.162
> > @@ -175,7 +175,6 @@
> >  gdk_export int strLen(const char *s);
> >  gdk_export int strCmp(str l, str r);
> >  gdk_export int strNil(str s);
> > -gdk_export void strHeapConvert(Heap *h, int directon);
> >  gdk_export int strElimDoubles(Heap *h);
> >  gdk_export var_t strLocate(Heap *h, str v);
> >  gdk_export int strCmpNoNil(unsigned char *l, unsigned char *r);
> > @@ -457,7 +456,7 @@
> >  	 0, 0,
> >  	 (var_t (*)(Heap *, var_t *, ptr)) strPut, 0,
> >  	 (int (*)(ptr)) strLen, strHeap,
> > -	 (void (*)(Heap *, int)) strHeapConvert, 0},
> > +	 (void (*)(Heap *, int)) 0, 0},
> >  };
> >  int GDKatomcnt = TYPE_str + 1;
> >
> > @@ -931,24 +930,25 @@
> >  	}								\
> >  } while (0)
> >
> > -#define GDK_STRHASHTABLE	(1<<10)
> > +/* string heaps:
> > + * - strings are 8 byte aligned
> > + * - start with a 1024 bucket hash table
> > + * - heaps < 64KB are fully duplicate eliminated with this hash tables
> > + * - heaps >= 64KB are opportunistically (imperfect) duplicate
> eliminated
> > + *   as only the last 128KB chunk is considered and there is no linked
> list
> > + * - buckets and next pointers are unsigned short "indices"
> > + * - indices should be multiplied by 8 and takes from ELIMBASE to get an
> offset
> > + *
> > + * Note that a 64KB chunk of the heap contains at most 8K 8-byte aligned
> > + * strings. The 1K bucket list means that in worst load, the list length
> is 8 (OK).
> > + */
> > +#define GDK_STRHASHTABLE	(1<<10) /* 1024 */
> >  #define GDK_STRHASHMASK		(GDK_STRHASHTABLE-1)
> > -#define GDK_STRHASHSIZE		(GDK_STRHASHTABLE * sizeof(var_t))
> > -#define GDK_STRHASHCREDIT(h)	(((var_t*) (h)-
> >base)[GDK_STRHASHTABLE])
> > +#define GDK_STRHASHSIZE		(GDK_STRHASHTABLE * sizeof(stridx_t))
> > +#define GDK_ELIMPOWER		16 /* 64KB is the threshold */
> >  #define GDK_ELIMDOUBLES(h)	((h)->free < GDK_ELIMLIMIT)
> > -#define GDK_ELIMLIMIT		(1<<GDK_ELIMPOWER)
> > +#define GDK_ELIMLIMIT		(1<<GDK_ELIMPOWER) /* equivalently:
> ELIMBASE == 0 */
> >  #define GDK_ELIMBASE(x)		(((x) >> GDK_ELIMPOWER) <<
> GDK_ELIMPOWER)
> > -#if SIZEOF_SIZE_T == SIZEOF_INT
> > -#define GDK_ELIMPOWER		16	/* makes for a max 64KB hash
> table
> > -					 * ie 256 string bytes per hash bucket
> > -					 * ~ 4 strings of UP4(8<=len<=11)=12 + 4
> bytes
> > -					 */
> > -#else
> > -#define GDK_ELIMPOWER		17	/* makes for a max 128KB hash
> table
> > -					 * ie 512 string bytes per hash bucket
> > -					 * ~ 5 strings of UP8(8<=len<=15)=16 + 8
> bytes
> > -					 */
> > -#endif
> >
> >  @- Atomic ADT functions
> >  @c
> > @@ -1767,46 +1767,34 @@
> >  Because in many typical situations lots of double string values occur
> >  in tables, the string insertion provides automatic double elimination.
> >  To do this, a GDK_STRHASHTABLE(=1024) bucket hashtable is hidden in the
> first
> > -4096 (8192 on 64-bit architectures) bytes of the string heap, consisting
> of integer offsets of the first
> > -string hashing to that bucket in the heap. Furthermore, the first 4(8)
> bytes
> > -before each string in the heap is an integer offset to the next string
> hashing
> > -to the same number.
> > +4096 bytes of the string heap, consisting an offset to the first string
> > +hashing to that bucket in the heap.
> > +These offsets are made small (stridx_t is an unsigned short) by
> exploiting
> > +the fact that the double elimination chunks are (now) 64KB, hence a
> short
> > +suffices.
> >
> > -However, in many other situations the cardinality of string columns is
> large,
> > +In many other situations the cardinality of string columns is large,
> >  or the string values might even be unique. In those cases, our fixed-
> size hash
> >  table will start to overflow quickly. Therefore, after the hash table is
> full
> >  (this is measured very simplistically by looking whether the string heap
> exceeds a
> > -heap size = GDK_ELIMLIMIT -- done this way to keep compatibility with
> old bat images)
> > -we flush the hash table. If one views the string heaps as consecutive
> chunks
> > -of size GDK_ELIMLIMIT bytes, then all strings within one chunk are
> double-eliminated.
> > -There is a macro GDK_ELIMBASE(offset) that computes the base of the
> chunk in which
> > -a certain byte-offset falls.
> > - at -
> > -This is a departure from our previous policy of not looking at the hash
> tables at
> > -all after overflow occurred. The advantage of the new approach is that
> if we have
> > -a value distribution that is skewed (ie some values are very frequent),
> these
> > -values will always be double eliminated, saving a considerable amount of
> space.
> > -Disadvantage of the approach is that we always have to reserve space for
> the next
> > -pointer (4(8) byte integer offset) that is stored right in front of the
> string (and
> > -consequently have to keep all string chunks and offsets aligned to
> 4(8)). All this
> > -translates into some wasted space. However, if there are that many
> different strings
> > -that the hash table overflows, the strings must be relatively long and
> the relative
> > -storage overhead should be low.
> > +heap size = GDK_ELIMLIMIT = 64KB) we flush the hash table. Even more,
> from that moment
> > +on, we do not use a linked list, but a lossy hash table that just
> contains
> > +the last position for each bucket. Basically, after exceeding
> GDK_ELIMLIMIT,
> > +we get a probabilistic/opportunistic duplicate elimination mechanism,
> > +that only looks at the last GDK_ELIMLIMIT chunk in the heap, in a lossy
> way.
> > +
> > +When comparing with the previous string implementation, the biggest
> difference
> > +is that on 64-nbits bt with 32-bits oids, strings are always 8-byte
> aligned
> > +and var_t numbers are multiplied by 8 to get the true offset. The goal
> to do
> > +this is to allow 32-bits var_t on 64-bits systems to address 32GB (using
> string
> > +alignment=8).  For large database, the cost of padding (4 bytes avg) is
> offset
> > +by the savings in var_t (allowing to go from 64- to 32-bits). Nothing
> lost there,
> > +and 32-bits var_t also pay in smaller OIDs and smaller hash tables,
> reducing memory
> > +pressure. For small duplicate eliminated heaps, the short indices
> > +used in the hash table have now allowed more buckets (2K instead of 1K)
> > +and average 2 bytes overhead for the next pointers instead of 6-12.
> Therefore
> > +small heaps are now more compact than before.
> >  @-
> > -Notice that this mechanism enables to keep a certain linear storage
> property
> > -in the string heaps. This is important if we want to take a BATslice on
> a BAT
> > -by simply loading or @strong{mmap()}ping slices of the BAT files on disk
> into memory.
> > -This is relevant in order to process a very large BAT iteratively by
> taking slices
> > -in order to reduce memory consumption. Notice that if there are few
> different string
> > -values, the hash table has not overflowed, and the string heap size will
> be small
> > -(i.e. < GDK_ELIMLIMIT), so in those cases it is not a problem to load
> the entire string heap.
> > -If the hash table @strong{has} overflowed, we want to be able to only
> map a slice of the
> > -string heap as well. Now, given that the first string in the BAT-slice
> is called F1
> > -and its heap offset is O1 and the last string in the slice is F2 and its
> > -offset is O2, then the slice we should take from the string heap is:
> > - at example
> > -GDK_ELIMBASE(F1) .. MAX(GDK_ELIMBASE(F2)+GDK_ELIMLIMIT), O2+strlen(F2))
> > - at end example
> >  The routine strElimDoubles() can be used to check whether all
> >  strings are still being double-eliminated in the original hash-table.
> >  Only then we know that unequal offset-integers in the BUN array means
> > @@ -1877,16 +1865,12 @@
> >  strHeap(Heap *d, size_t cap)
> >  {
> >  	size_t size;
> > -	var_t *h, *e;
> >
> >  	cap = MAX(cap, BATTINY);
> > -	size = (GDK_STRHASHTABLE + 1) * sizeof(var_t) + MIN(GDK_ELIMLIMIT,
> cap * 12);
> > +	size = GDK_STRHASHTABLE * sizeof(stridx_t) + MIN(GDK_ELIMLIMIT, cap *
> GDK_VARALIGN);
> >  	if (HEAPalloc(d, size, 1) >= 0) {
> > -		d->free = GDK_STRHASHTABLE * sizeof(var_t);
> > -		h = (var_t *) d->base;
> > -		for (e = h; e < h + GDK_STRHASHTABLE; e++) {
> > -			*e = 0;
> > -		}
> > +		d->free = GDK_STRHASHTABLE * sizeof(stridx_t);
> > +		memset(d->base, 0, d->free);
> >  	}
> >  }
> >
> > @@ -1923,42 +1907,10 @@
> >  void
> >  strCleanHash(Heap *h, int rebuild)
> >  {
> > +	(void) rebuild;
> >  	if (!GDK_ELIMDOUBLES(h)) {
> >  		/* flush hash table for security */
> >  		memset(h->base, 0, GDK_STRHASHSIZE);
> > -	} else if (rebuild) {
> > -		var_t xx, cur = 0, end = 0;
> > -		str hash = (str) h->base;
> > -
> > -/* int cnt[GDK_STRHASHTABLE]; */
> > -		/* collect all values in one big linked list */
> > -		for (xx = 0; xx < GDK_STRHASHTABLE; xx++) {
> > -			var_t yy = ((var_t *) hash)[xx];
> > -
> > -/* cnt[xx]=0; */
> > -			((var_t *) hash)[xx] = 0;	/* clear hash table slot
*/
> > -
> > -			if (end) {
> > -				*(var_t *) (hash + end) = yy;
> > -			} else {
> > -				cur = yy;
> > -			}
> > -			for (; yy; yy = *(var_t *) (hash + yy))
> > -				end = yy;
> > -		}
> > -
> > -		/* process the linked list, inserting the values again */
> > -		for (; cur; cur = end) {
> > -			str val = hash + cur;
> > -			GDK_STRHASH(val + sizeof(var_t), xx);
> > -			xx &= GDK_STRHASHMASK;
> > -			end = *(var_t *) val;
> > -			*(var_t *) val = ((var_t *) hash)[xx];
> > -			((var_t *) hash)[xx] = cur;
> > -/* cnt[xx]++; */
> > -		}
> > -/* for(xx=0; xx<GDK_STRHASHTABLE; xx++)
> > -   if(cnt[xx]) stream_printf(GDKout, "%5d %6d", xx, cnt[xx]); */
> >  	}
> >  }
> >
> > @@ -1970,90 +1922,63 @@
> >  var_t
> >  strLocate(Heap *h, str v)
> >  {
> > -	var_t *htab = (var_t *) h->base;
> > -	var_t *l, *e;
> > -	BUN idx;
> > -
> > -	GDK_STRHASH(v, idx);
> > -	e = htab + (idx & GDK_STRHASHMASK);
> > -	if (*e) {
> > -		for (l = e; *l && *l < h->free; l = (var_t *) ((char *) h->base
> + *l)) {
> > -			str x = (str) ((char *) h->base + *l + sizeof(var_t));
> > -
> > -			if (GDK_STRCMP(v, x) == 0) {
> > -				return *l + (var_t) sizeof(var_t);
> > -			}
> > -		}
> > -	}
> > -	return 0;
> > -}
> > +	stridx_t *ref, *next;
> >
> > -#if SIZEOF_SIZE_T == SIZEOF_INT
> > -#define normal_vart_SWAP(x)	((var_t) normal_int_SWAP((int)x))
> > -#else
> > -#define normal_vart_SWAP(x)	((var_t) long_long_SWAP((lng)x))
> > -#endif
> > +	/* search hash-table, if double-elimination is still in place */
> > +	BUN off; GDK_STRHASH(v, off);
> > +	off &= GDK_STRHASHMASK;
> >
> > -/* convert the integers in the implicit hash table structure */
> > -void
> > -strHeapConvert(Heap *h, int dir)
> > -{
> > -	var_t *htab = (var_t *) h->base;
> > -	var_t *l, i, j;
> > +	/* should only use strLocate iff fully double eliminated */
> > +	assert(GDK_ELIMBASE(h->free) == 0);
> >
> > -	if (dir == CONV_HTON) {
> > -		for (i = 0; i < GDK_STRHASHTABLE; i++) {
> > -			for (l = htab + i; (j = *l) != 0 && j < h->free; l =
> (var_t *) (h->base + j)) {
> > -				*l = normal_vart_SWAP(j);
> > -			}
> > -		}
> > -	} else {
> > -		for (i = 0; i < GDK_STRHASHTABLE; i++) {
> > -			for (l = htab + i; (j = *l) != 0 && j < h->free; l =
> (var_t *) (h->base + *l)) {
> > -				*l = normal_vart_SWAP(j);
> > -			}
> > -		}
> > +	/* search the linked list */
> > +	for (ref = ((stridx_t *) h->base) + off; *ref; ref = next) {
> > +		next = (stridx_t*) (h->base + *ref);
> > +		if (GDK_STRCMP(v, (str) (next+1)) == 0)
> > +			return (sizeof(stridx_t) + *ref) >> GDK_VARSHIFT; /*
> found */
> >  	}
> > +	return 0;
> >  }
> >
> >  var_t
> >  strPut(Heap *h, var_t *dst, str v)
> >  {
> > -	var_t *l;
> > -	size_t i = GDK_STRLEN(v);
> > -	BUN off;
> > -
> > -	/* round up to var_t-byte alignment + var_t (next pointer) */
> > -	size_t len = ((i + sizeof(var_t) - 1) & ~(sizeof(var_t) - 1)) +
> sizeof(var_t);
> > -	size_t elimlimit = GDK_ELIMBASE(h->free) + GDK_ELIMLIMIT;
> > +	size_t elimbase = GDK_ELIMBASE(h->free);
> > +	size_t pad = GDK_VARALIGN - (h->free & (GDK_VARALIGN-1));
> > +	size_t pos, len = GDK_STRLEN(v);
> > +	stridx_t *bucket, *ref, *next;
> >
> >  	/* search hash-table, if double-elimination is still in place */
> > -	GDK_STRHASH(v, off);
> > +	BUN off; GDK_STRHASH(v, off);
> >  	off &= GDK_STRHASHMASK;
> > -	for (l = ((var_t *) h->base) + off; *l && *l < h->free; l = (var_t *)
> (h->base + *l)) {
> > -		str x = (str) (h->base + *l + sizeof(var_t));
> > +	bucket = ((stridx_t *) h->base) + off;
> >
> > -		if (GDK_STRCMP(v, x) == 0) {
> > -			*dst = *l + (var_t) sizeof(var_t);	/* already in
heap;
> do not insert! */
> > -			if (GDK_ELIMDOUBLES(h) == 0 && GDK_STRHASHCREDIT(h))
> > -				GDK_STRHASHCREDIT(h) += 4;
> > -			return *dst;
> > +	if (elimbase == 0) { /* small string heap (<64KB) -- fully double
> eliminated */
> > +		for (ref = bucket; *ref; ref = next) { /* search the linked
> list */
> > +			next = (stridx_t*) (h->base + *ref);
> > +			if (GDK_STRCMP(v, (str) (next+1)) == 0) { /* found */
> > +				pos = sizeof(stridx_t) + *ref;
> > +				return *dst = (pos >> GDK_VARSHIFT);
> > +			}
> >  		}
> > -	}
> > -
> > -	/* flush the hash table if it becomes too big (implies
> !GDK_ELIMDOUBLES) */
> > -	if (h->free + len >= elimlimit) {
> > -		/* if we are not hash-inserting anymore, h->free may no longer
> be var_t aligned */
> > -		size_t mask = h->free & (sizeof(var_t) - 1);
> > -
> > -		if (mask)
> > -			h->free += sizeof(var_t) - mask;	/* realign */
> > -		memset(h->base, 0, GDK_STRHASHSIZE);	/* start over hash
> inserting in a pristine hash table */
> > -		GDK_STRHASHCREDIT(h) = 32;	/* only tolerate limited misses
> in the future */
> > +		/* is there room for the next pointer in the padding space? */
> > +		if (pad < sizeof(stridx_t))
> > +			pad += GDK_VARALIGN; /* if not, pad more */
> > +	} else {
> > +	        /* large string heap (>=64KB) -- opportunistic/probabilistic
> double elimination */
> > +		pos = elimbase + *bucket;
> > +		if (GDK_STRCMP(v, (str) (h->base + pos)) == 0) {
> > +			return *dst = (pos >> GDK_VARSHIFT); /* already in heap;
> do not insert! */
> > +		}
> > +#if SIZEOF_VAR_T < SIZEOF_VOID_P
> > +		pad &= (GDK_VARALIGN-1); /* a full VARALIGN pad can be omitted
> */
> > +#else
> > +		pad = 0; /* only 32-bits var_t in 64-bits needs padding */
> > +#endif
> >  	}
> >
> >  	/* check heap for space (limited to a certain maximum after which
> nils are inserted) */
> > -	if (h->free + len >= h->size) {
> > +	if (h->free + pad + len >= h->size) {
> >  		/* Something really strange happens here, In a special case
> >  		   (Pentium II Klamath, gcc version 2.96 20000731,
> >  		   GNU assembler version 2.10.90 using BFD version 2.10.0.18)
> > @@ -2064,11 +1989,15 @@
> >  		 */
> >  		float batmargin = (float) BATMARGIN;
> >  		float hnewsize = h->size * batmargin;
> > -		size_t newsize = len + (size_t) hnewsize;
> > +		size_t newsize = pad + len + (size_t) hnewsize;
> >
> >  		assert(newsize);
> >
> > -		if (h->free + len < h->maxsize) {
> > +		if (h->free + pad + len >= (((size_t) VAR_MAX) <<
> GDK_VARSHIFT)) {
> > +			GDKerror("strPut: string heaps gets larger than
%dGB.\n",
> (((size_t) VAR_MAX) << GDK_VARSHIFT) >> 30);
> > +			return 0;
> > +		}
> > +		if (h->free + pad + len < h->maxsize) {
> >  			/* if there is reserved space, first use the reserved
> space */
> >  			newsize = MIN(newsize, h->maxsize);
> >  		}
> > @@ -2077,32 +2006,27 @@
> >  		}
> >  		/* fill should solve initialisation problems within valgrind */
> >  		memset(h->base + h->free, 0, h->size - h->free);
> > -	}
> >
> > -	if (!GDK_ELIMDOUBLES(h)) {
> > -		if (GDK_STRHASHCREDIT(h) == 0) {
> > -			/* if credits are gone, we do not hash insert at all */
> > -			if (h->free > VAR_MAX) {
> > -				GDKerror("strPut: string heaps gets larger than
2GB
> -- too large for 32-bits oids.\n");
> > -				return 0;
> > -			}
> > -			*dst = (var_t) h->free;
> > -			memcpy(h->base + h->free, v, i);
> > -			h->free += i;	/* in this case, we do not round to
> var_t either */
> > -			return *dst;
> > -		}
> > -		GDK_STRHASHCREDIT(h)--;
> > +		/* make bucket point into the enw heap */
> > +		bucket = ((stridx_t *) h->base) + off;
> >  	}
> >
> > -	/* insert string in hash table and copy into the heap */
> > -	l = (var_t *) (h->base + h->free);
> > -	*(l++) = ((var_t *) h->base)[off];
> > -	assert(h->free + sizeof(var_t) <= VAR_MAX);
> > -	((var_t *) h->base)[off] = (var_t) h->free;
> > -	*dst = (var_t) (h->free + sizeof(var_t));
> > -	h->free += len;
> > -	memcpy((char *) l, v, i);
> > +	/* insert string */
> > +	pos = h->free + pad;
> > +	*dst = pos >> GDK_VARSHIFT;
> > +	memcpy(h->base + pos, v, len);
> > +	h->free += pad + len;
> > +
> > +	/* maintain hash table */
> > +	if (elimbase == 0) { /* small string heap: link the next pointer */
> > +		pos -= sizeof(stridx_t); /* the stridx_t next pointer directly
> precedes the string */
> > +		*(stridx_t*) (h->base + pos) = *bucket;
> > +	}
> > +	*bucket = (stridx_t) (pos - elimbase); /* set bucket to the new
> string */
> >
> > +	if (h->free >= elimbase + GDK_ELIMLIMIT) {
> > +		memset(h->base, 0, GDK_STRHASHSIZE); /* flush hash table */
> > +	}
> >  	return *dst;
> >  }
> >
> >
> > U gdk_bbp.mx
> > Index: gdk_bbp.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_bbp.mx,v
> > retrieving revision 1.252
> > retrieving revision 1.253
> > diff -u -d -r1.252 -r1.253
> > --- gdk_bbp.mx	9 Apr 2009 15:29:18 -0000	1.252
> > +++ gdk_bbp.mx	13 Apr 2009 23:36:24 -0000	1.253
> > @@ -2965,9 +2965,9 @@
> >  		BATsetcount(&bs->B, 0);
> >
> >  		if (bs->H.vheap)
> > -			memset(bs->H.vheap->base, 0, bs->H.vheap->free =
> GDK_STRHASHTABLE * sizeof(var_t));
> > +			memset(bs->H.vheap->base, 0, bs->H.vheap->free =
> GDK_STRHASHTABLE * sizeof(stridx_t));
> >  		if (bs->T.vheap)
> > -			memset(bs->T.vheap->base, 0, bs->T.vheap->free =
> GDK_STRHASHTABLE * sizeof(var_t));
> > +			memset(bs->T.vheap->base, 0, bs->T.vheap->free =
> GDK_STRHASHTABLE * sizeof(stridx_t));
> >  		return bs;
> >  	}
> >  	BATDEBUG THRprintf(GDKout, "#BBPrecycle %d %d "SZFMT" (%d, %d %d %d)
> N2\n", ht, tt, cap, BATCACHE_NOTYPE(ht), BATCACHE_NOTYPE(tt),
> batcache_maxbuckets, bin);
> >
> > U gdk_batop.mx
> > Index: gdk_batop.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_batop.mx,v
> > retrieving revision 1.170
> > retrieving revision 1.171
> > diff -u -d -r1.170 -r1.171
> > --- gdk_batop.mx	7 Jan 2009 14:13:48 -0000	1.170
> > +++ gdk_batop.mx	13 Apr 2009 23:36:24 -0000	1.171
> > @@ -1656,7 +1656,7 @@
> >  				if (b->hkey == 0) {
> >  					/* sorted and key? */
> >  					while (cur < end) {
> > -						char *val = base + *(((var_t
*)b->H-
> >heap.base)+ cur);
> > +						char *val = base + (*(((var_t
*)b->H-
> >heap.base)+ cur) << GDK_VARSHIFT);
> >
> >  						if (cmp(prv, val) @5= 0) {
> >  							key = FALSE;
> > @@ -1668,7 +1668,7 @@
> >  				}
> >  				/* sorted? */
> >  				while (cur < end) {
> > -					char *val = base + *(((var_t *)b->H-
> >heap.base)+ cur);
> > +					char *val = base + (*(((var_t *)b->H-
> >heap.base)+ cur) << GDK_VARSHIFT);
> >
> >  					if (cmp(prv, val) @5 0) {
> >  						/* record negative position info
*/
> >
> > U gdk_utils.mx
> > Index: gdk_utils.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_utils.mx,v
> > retrieving revision 1.246
> > retrieving revision 1.247
> > diff -u -d -r1.246 -r1.247
> > --- gdk_utils.mx	9 Apr 2009 18:48:25 -0000	1.246
> > +++ gdk_utils.mx	13 Apr 2009 23:36:24 -0000	1.247
> > @@ -382,7 +382,7 @@
> >  #define GDK_MEM_NULLALLOWED
> >
> >  #if SIZEOF_VOID_P==8
> > -#define GDK_VM_MAXSIZE	LL_CONSTANT(137438953472)	/* :-) a 64-bit
> OS: 128 GB */
> > +#define GDK_VM_MAXSIZE	LL_CONSTANT(4398046511104) /* :-) a 64-bit
> OS: 4TB */
> >  #else
> >  #define GDK_VM_MAXSIZE	LL_CONSTANT(1610612736)	/* :-| a 32-bit OS:
> 1.5GB */
> >  #endif
> >
> > U gdk_heap.mx
> > Index: gdk_heap.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_heap.mx,v
> > retrieving revision 1.117
> > retrieving revision 1.118
> > diff -u -d -r1.117 -r1.118
> > --- gdk_heap.mx	20 Mar 2009 11:59:57 -0000	1.117
> > +++ gdk_heap.mx	13 Apr 2009 23:36:24 -0000	1.118
> > @@ -75,8 +75,20 @@
> >  nice).
> >  @{
> >  @c
> > -int
> > -HEAPalloc(Heap *h, size_t nitems, size_t itemsize)
> > +size_t HEAPmargin(size_t maxsize) {
> > +	size_t ret;
> > +#if SIZEOF_VOID_P == 8
> > +	/* in 64-bits systems, try to enforce in-place realloc, but provoke
> the memcpy on 256MB, then 4GB */
> > +	size_t use = GDKvm_cursize();
> > +	ret = MIN(GDK_mem_maxsize, MAX(((size_t) 1) << 26, 16*maxsize));
> > +	if ((ret+ret) > (GDK_vm_maxsize-MIN(GDK_vm_maxsize,use))) /* only if
> room */
> > +#endif
> > +	ret = ((double) BATMARGIN)*maxsize - 1; /* do not waste VM on 32-bits
> */
> > +	return (1 + (MAX(maxsize,ret) >> 16)) << 16; /* round up to 64K */
> > +}
> > +
> > +/* in 64-bits space, use very large margins to accomodate reallocations
> */
> > +int HEAPalloc(Heap *h, size_t nitems, size_t itemsize)
> >  {
> >  	char nme[PATHLENGTH], *ext = NULL;
> >
> > @@ -98,8 +110,7 @@
> >  	/* when using anonymous vm we malloc we need 64K chunks, also we
> >  	 * 20% extra malloc */
> >  	if (h->size > GDK_mem_bigsize) {
> > -		h->maxsize = (size_t) ((double) h->maxsize * BATMARGIN) - 1;
> > -		h->maxsize = (1 + (h->maxsize >> 16)) << 16;
> > +		h->maxsize = HEAPmargin(h->maxsize);
> >  	}
> >  	if (h->filename == NULL || (h->size < GDK_mmap_minsize)) {
> >  		h->storage = STORE_MEM;
> > @@ -169,17 +180,14 @@
> >  		/* extend a malloced heap, possibly switching over to file-
> mapped storage */
> >  		Heap bak = *h;
> >  		int can_mmap = h->filename && (size >= GDK_mem_bigsize || h-
> >newstorage != STORE_MEM);
> > -		int must_mmap = can_mmap && (size >= GDK_mmap_minsize || h-
> >newstorage != STORE_MEM);
> > +		int small_cpy = (h->size*4 < size) && (size >=
> GDK_mmap_minsize);
> > +		int must_mmap = can_mmap && (small_cpy || h->newstorage !=
> STORE_MEM);
> >
> >  		h->size = size;
> >
> >  		if (can_mmap) {
> >  			/* in anonymous vm, if have to realloc anyway, we
reserve
> some extra space */
> > -			if (size > h->maxsize) {
> > -				h->maxsize = (size_t) ((double) size *
BATMARGIN);
> > -			}
> > -			/* when using anonymous vm we malloc we need 64K chunks
> */
> > -			h->maxsize = (1 + ((h->maxsize - 1) >> 16)) << 16;
> > +			h->maxsize = HEAPmargin(MAX(size,h->maxsize));
> >  		} else {
> >  			h->maxsize = size;	/* for normal GDKmalloc, maxsize
> = size */
> >  		}
> > @@ -514,9 +522,9 @@
> >  #define HEAPVERSION	20030408
> >
> >  typedef struct heapheader {
> > -	var_t head;		/* index to first free block            */
> > +	size_t head;		/* index to first free block            */
> >  	int alignment;		/* alignment of objects on heap         */
> > -	var_t firstblock;	/* first block in heap                  */
> > +	size_t firstblock;	/* first block in heap                  */
> >  	int version;
> >  	int (*sizefcn) (ptr);	/* ADT function to ask length           */
> >  } HEADER32;
> > @@ -524,8 +532,8 @@
> >  typedef struct {
> >  	int version;
> >  	int alignment;
> > -	var_t head;
> > -	var_t firstblock;
> > +	size_t head;
> > +	size_t firstblock;
> >  	int (*sizefcn) (ptr);
> >  } HEADER64;
> >
> > @@ -537,8 +545,8 @@
> >  typedef HEADER64 HEADER_OTHER;
> >  #endif
> >  typedef struct hfblock {
> > -	var_t size;		/* Size of this block in freelist        */
> > -	var_t next;		/* index of next block                   */
> > +	size_t size;		/* Size of this block in freelist        */
> > +	size_t next;		/* index of next block                   */
> >  } CHUNK;
> >
> >  @c
> > @@ -546,13 +554,13 @@
> >  #define roundup_4(x)	(((x)+3)&~3)
> >  #define blocksize(h,p)	((p)->size)
> >
> > -static INLINE var_t
> > -roundup_num(var_t number, int alignment)
> > +static INLINE size_t
> > +roundup_num(size_t number, int alignment)
> >  {
> > -	var_t rval;
> > +	size_t rval;
> >
> > -	rval = number + (var_t) alignment - 1;
> > -	rval -= (rval % (var_t) alignment);
> > +	rval = number + (size_t) alignment - 1;
> > +	rval -= (rval % (size_t) alignment);
> >  	return rval;
> >  }
> >
> > @@ -560,7 +568,7 @@
> >  HEAP_private(Heap *h)
> >  {
> >  	(void) h;
> > -	return (var_t) roundup_8(sizeof(HEADER));
> > +	return (var_t) (roundup_8(sizeof(HEADER)) >> GDK_VARSHIFT);
> >  }
> >
> >  #ifdef TRACE
> > @@ -568,7 +576,7 @@
> >  HEAP_printstatus(Heap *heap)
> >  {
> >  	HEADER *hheader = HEAP_index(heap, 0, HEADER);
> > -	var_t block, cur_free = hheader->head;
> > +	size_t block, cur_free = hheader->head;
> >  	CHUNK *blockp;
> >
> >  	THRprintf(GDKout, "#HEAP has head " SZFMT " and alignment %d and size
> " SZFMT "\n",
> > @@ -591,7 +599,7 @@
> >  			cur_free = blockp->next;
> >  			block += blockp->size;
> >  		} else {
> > -			var_t size = blocksize(hheader, blockp);
> > +			size_t size = blocksize(hheader, blockp);
> >
> >  			THRprintf(GDKout, "#   block at " SZFMT " with size "
> SZFMT "\n", block, size);
> >  			block += size;
> > @@ -611,7 +619,7 @@
> >  	/*
> >  	   // Calculate position of first and only free block.
> >  	 */
> > -	var_t head = roundup_num((var_t) (roundup_8(sizeof(HEADER)) +
> roundup_8(nprivate)), alignment);
> > +	size_t head = roundup_num((size_t) (roundup_8(sizeof(HEADER)) +
> roundup_8(nprivate)), alignment);
> >  	CHUNK *headp = HEAP_index(heap, head, CHUNK);
> >
> >  	assert(roundup_8(sizeof(HEADER)) + roundup_8(nprivate) <= VAR_MAX);
> > @@ -629,7 +637,7 @@
> >  	   // Fill first free block.
> >  	 */
> >  	assert(heap->size - head <= VAR_MAX);
> > -	headp->size = (var_t) (heap->size - head);
> > +	headp->size = (size_t) (heap->size - head);
> >  	headp->next = 0;
> >  #ifdef TRACE
> >  	THRprintf(GDKout, "#We created the following heap\n");
> > @@ -669,9 +677,9 @@
> >
> >
> >  var_t
> > -HEAP_malloc(Heap *heap, var_t nbytes)
> > +HEAP_malloc(Heap *heap, size_t nbytes)
> >  {
> > -	var_t block, trail, ttrail;
> > +	size_t block, trail, ttrail;
> >  	CHUNK *blockp;
> >  	CHUNK *trailp;
> >  	HEADER *hheader = HEAP_index(heap, 0, HEADER);
> > @@ -682,15 +690,9 @@
> >
> >  	/* add space for size field */
> >  	nbytes += hheader->alignment;
> > -	if (hheader->alignment == 8) {
> > -		nbytes = roundup_8(nbytes);
> > -	} else if (hheader->alignment == 4) {
> > -		nbytes = roundup_4(nbytes);
> > -	} else {
> > -		GDKfatal("HEAP_malloc: Heap structure corrupt\n");
> > -	}
> > +	nbytes = roundup_8(nbytes);
> >  	if (nbytes < sizeof(CHUNK))
> > -		nbytes = (var_t) sizeof(CHUNK);
> > +		nbytes = (size_t) sizeof(CHUNK);
> >
> >  	/*
> >  	   // block  -- points to block with acceptable size (if available).
> > @@ -718,12 +720,12 @@
> >  	   // If no block of acceptable size is found we try to enlarge the
> heap.
> >  	 */
> >  	if (block == 0) {
> > -		var_t newsize;
> > +		size_t newsize;
> >
> >  		assert(heap->free + MAX(heap->free, nbytes) <= VAR_MAX);
> > -		newsize = (var_t) roundup_8(heap->free + MAX(heap->free,
> nbytes));
> > +		newsize = (size_t) roundup_8(heap->free + MAX(heap->free,
> nbytes));
> >  		assert(heap->free <= VAR_MAX);
> > -		block = (var_t) heap->free;	/* current end-of-heap */
> > +		block = (size_t) heap->free;	/* current end-of-heap */
> >
> >  #ifdef TRACE
> >  		THRprintf(GDKout, "#No block found\n");
> > @@ -747,7 +749,7 @@
> >
> >  		blockp->next = 0;
> >  		assert(heap->free - block <= VAR_MAX);
> > -		blockp->size = (var_t) (heap->free - block);	/* determine
> size of allocated block */
> > +		blockp->size = (size_t) (heap->free - block);	/* determine
> size of allocated block */
> >
> >  		/*
> >  		   // Try to join the last block in the freelist and the newly
> allocated
> > @@ -778,7 +780,7 @@
> >  	   // TUNE: use different amount than 2*sizeof(CHUNK)
> >  	 */
> >  	if (blockp->size >= nbytes + 2 * sizeof(CHUNK)) {
> > -		var_t newblock = block + nbytes;
> > +		size_t newblock = block + nbytes;
> >  		CHUNK *newblockp = HEAP_index(heap, newblock, CHUNK);
> >
> >  		newblockp->size = blockp->size - nbytes;
> > @@ -800,17 +802,17 @@
> >  	}
> >
> >  	block += hheader->alignment;
> > -	return block;
> > +	return block >> GDK_VARSHIFT;
> >  }
> >
> >  void
> > -HEAP_free(Heap *heap, var_t block)
> > +HEAP_free(Heap *heap, var_t mem)
> >  {
> >  	HEADER *hheader = HEAP_index(heap, 0, HEADER);
> >  	CHUNK *beforep;
> >  	CHUNK *blockp;
> >  	CHUNK *afterp;
> > -	var_t after, before;
> > +	size_t after, before, block = mem << GDK_VARSHIFT;
> >
> >  	if (hheader->alignment != 8 && hheader->alignment != 4) {
> >  		GDKfatal("HEAP_free: Heap structure corrupt\n");
> > @@ -884,10 +886,10 @@
> >  HEAP_check(Heap *heap, HeapRepair *hr)
> >  {
> >  	HEADER *hheader = HEAP_index(heap, 0, HEADER);
> > -	var_t head = hheader->head, alignshift = 2;
> > -	var_t block, nwords = (var_t) ((heap->free - 1) >> 7);
> > +	size_t head = hheader->head, alignshift = 2;
> > +	size_t block, nwords = (size_t) ((heap->free - 1) >> 7);
> >  	int *freemask;
> > -	var_t prevblock = 0;
> > +	size_t prevblock = 0;
> >  	CHUNK *blockp;
> >
> >  	hr->alignment = hheader->alignment;
> > @@ -922,8 +924,8 @@
> >  	   // Walk the freelist; register them in freemask
> >  	 */
> >  	for (block = hheader->head; block != 0; block = HEAP_index(heap,
> block, CHUNK)->next) {
> > -		var_t idx = block >> alignshift;
> > -		var_t pos = idx >> 5;
> > +		size_t idx = block >> alignshift;
> > +		size_t pos = idx >> 5;
> >  		int mask = 1 << (idx & 31);
> >
> >  		if ((block <= prevblock) && (block != 0)) {
> > @@ -942,8 +944,8 @@
> >  	 */
> >  	block = hheader->firstblock;
> >  	while (block < heap->free) {
> > -		var_t idx = block >> alignshift;
> > -		var_t pos = idx >> 5;
> > +		size_t idx = block >> alignshift;
> > +		size_t pos = idx >> 5;
> >  		int mask = 1 << (idx & 31);
> >
> >  		hr->validmask[pos] |= mask;
> > @@ -965,8 +967,8 @@
> >  	   // Check if there are left over free blocks
> >  	 */
> >  	for (block = hheader->head; block != 0; block = HEAP_index(heap,
> block, CHUNK)->next) {
> > -		var_t idx = block >> alignshift;
> > -		var_t pos = idx >> 5;
> > +		size_t idx = block >> alignshift;
> > +		size_t pos = idx >> 5;
> >  		int mask = 1 << (idx & 31);
> >
> >  		if (freemask[pos] & mask) {
> > @@ -1046,14 +1048,14 @@
> >  	if (hheader->head > heap->free) {
> >  		hheader->head = 0;	/* cut off free block */
> >  	} else if (hheader->head) {
> > -		var_t idx = hheader->head;
> > +		size_t idx = hheader->head;
> >
> >  		while (idx) {
> >  			CHUNK *blk = HEAP_index(heap, idx, CHUNK);
> >
> >  			if (idx + blk->size > heap->free) {
> >  				assert(heap->free - idx <= VAR_MAX);
> > -				blk->size = (var_t) (heap->free - idx);	/* cut
> off illegal tail of block */
> > +				blk->size = (size_t) (heap->free - idx);
/* cut
> off illegal tail of block */
> >  			}
> >  			if (blk->next > heap->free || blk->next < (idx + blk-
> >size) || (blk->next & (hheader->alignment - 1))) {
> >  				blk->next = 0;	/* cut off next block */
> >
> > U gdk_qsort.mx
> > Index: gdk_qsort.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_qsort.mx,v
> > retrieving revision 1.34
> > retrieving revision 1.35
> > diff -u -d -r1.34 -r1.35
> > --- gdk_qsort.mx	7 Jan 2009 14:13:48 -0000	1.34
> > +++ gdk_qsort.mx	13 Apr 2009 23:36:24 -0000	1.35
> > @@ -86,6 +86,7 @@
> >  	char *offst;		/* NULL or start of varsized heap */
> >  	int hshift;		/* log2 of hs */
> >  	int tshift;		/* log2 of hs */
> > +	int vshift;		/* shift to be applied on var_ offsets */
> >  	unsigned hs;		/* width of head record */
> >  	unsigned ts;		/* width of tail record */
> >  	void *h;		/* start of head buns */
> > @@ -189,7 +190,7 @@
> >  #endif
> >  #endif
> >
> > -#define offset(p)		(buf->offst + *(var_t*) (p))
> > +#define offset(p)		(buf->offst + ((*(var_t*) (p)) << buf-
> >vshift))
> >  #define direct(p)		(p)
> >
> >  #define any_LE(a,b)		((buf->cmp)(a,b) <= 0)
> > @@ -432,6 +433,7 @@
> >  	buf.ts = (unsigned) ts;
> >  	buf.hshift = ATOMelmshift(hs);
> >  	buf.tshift = ATOMelmshift(ts);
> > +	buf.vshift = ATOMvarsized(tpe)?GDK_VARSHIFT:0;
> >  	buf.h = h;
> >  	if (!t)
> >  		t = &x;
> >
> > U gdk_bat.mx
> > Index: gdk_bat.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_bat.mx,v
> > retrieving revision 1.214
> > retrieving revision 1.215
> > diff -u -d -r1.214 -r1.215
> > --- gdk_bat.mx	3 Apr 2009 09:14:52 -0000	1.214
> > +++ gdk_bat.mx	13 Apr 2009 23:36:24 -0000	1.215
> > @@ -434,7 +434,7 @@
> >  BAT *
> >  BATextend(BAT *b, BUN newcap)
> >  {
> > -	size_t hheap_size, theap_size;
> > +	size_t hheap_size = newcap, theap_size = newcap;
> >
> >  	assert(newcap <= BUN_MAX);
> >  	BATcheck(b, "BATextend");
> > @@ -453,10 +453,10 @@
> >
> >  	b->batCapacity = newcap;
> >
> > -	hheap_size = Hsize(b) * newcap;
> > +	hheap_size *= Hsize(b);
> >  	if (b->H->heap.base && HEAPextend(&b->H->heap, hheap_size) < 0)
> >  		return NULL;
> > -	theap_size = Tsize(b) * newcap;
> > +	theap_size *= Tsize(b);
> >  	if (b->T->heap.base && HEAPextend(&b->T->heap, theap_size) < 0)
> >  		return NULL;
> >  	HASHdestroy(b);
> >
> > U gdk_ssort.mx
> > Index: gdk_ssort.mx
> > ===================================================================
> > RCS file: /cvsroot/monetdb/MonetDB/src/gdk/gdk_ssort.mx,v
> > retrieving revision 1.15
> > retrieving revision 1.16
> > diff -u -d -r1.15 -r1.16
> > --- gdk_ssort.mx	7 Jan 2009 14:13:48 -0000	1.15
> > +++ gdk_ssort.mx	13 Apr 2009 23:36:24 -0000	1.16
> > @@ -203,8 +203,8 @@
> >  		}						\
> >  	} while (0)
> >
> > -#define ISLT_any(X, Y, ms)  (((ms)->heap ? (*(ms)->compare)((ms)->heap +
> * (var_t *) (X), (ms)->heap + * (var_t *) (Y)) : (*(ms)->compare)((X),
> (Y))) < 0)
> > -#define ISLT_any_rev(X, Y, ms)  (((ms)->heap ? (*(ms)->compare)((ms)-
> >heap + * (var_t *) (X), (ms)->heap + * (var_t *) (Y)) : (*(ms)-
> >compare)((X), (Y))) > 0)
> > +#define ISLT_any(X, Y, ms)  (((ms)->heap ? (*(ms)->compare)((ms)->heap +
> ((*(var_t*) (X)) << GDK_VARSHIFT), (ms)->heap + ((*(var_t*) (Y)) <<
> GDK_VARSHIFT)) : (*(ms)->compare)((X), (Y))) < 0)
> > +#define ISLT_any_rev(X, Y, ms)  (((ms)->heap ? (*(ms)->compare)((ms)-
> >heap + ((*(var_t*) (X)) << GDK_VARSHIFT), (ms)->heap + ((*(var_t*) (Y)) <<
> GDK_VARSHIFT)) : (*(ms)->compare)((X), (Y))) > 0)
> >  @= islt
> >  #define ISLT_ at 1@2(X, Y, ms)	(* (@1 *) (X) @3 * (@1 *) (Y))
> >
> >
> >
> > -------------------------------------------------------------------------
> -----
> > This SF.net email is sponsored by:
> > High Quality Requirements in a Collaborative Environment.
> > Download a free trial of Rational Requirements Composer Now!
> > http://p.sf.net/sfu/www-ibm-com
> > _______________________________________________
> > Monetdb-checkins mailing list
> > Monetdb-checkins at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/monetdb-checkins
> 
> 
> --
> Sjoerd Mullender
> 
> 
> No virus found in this incoming message.
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> 06:17:00





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