Re: [Monetdb-developers] [Monetdb-checkins] MonetDB/src/gdk gdk.mx, Feb2010, 1.301.2.9, 1.301.2.10 gdk_bat.mx, Feb2010, 1.236.2.4, 1.236.2.5 gdk_batop.mx, Feb2010, 1.180.2.15, 1.180.2.16 gdk_bbp.mx, Feb2010, 1.269.2.5, 1.269.2.6 gdk_posix.mx, Feb2010, 1.176.2.11, 1.176.2.12 gdk_relop.mx, Feb2010, 1.179.2.13, 1.179.2.14 gdk_storage.mx, Feb2010, 1.149.2.21, 1.149.2.22 gdk_utils.mx, Feb2010, 1.262.2.10, 1.262.2.11

On Fri, Feb 12, 2010 at 07:15:52PM +0100, Stefan Manegold wrote:

Peter,

...

+/* a thread informs it is goin to (preload==1) or stops (preload==-1) using a range of memory */ void -MT_mmap_pin(void *base, size_t len) +MT_mmap_inform(void *base, size_t len, int preload, int advise, int writable) { int i;

(void) pthread_mutex_lock(&MT_mmap_lock); i = MT_mmap_idx(base, len); if (i >= 0) {

• MT_mmap_tab[i].pincnt++;
  

• if (writable) MT_mmap_tab[i].writable = (writable > 0);
  

• MT_mmap_tab[i].random += (advise == BUF_WILLNEED); /* done as a counter to keep track of multiple threads */
  

                                     ^^^^^^^^^^^^^^^^^^^^^^^^

shouldn't this rather be something like MT_mmap_tab[i].random += preload * (advise == BUF_WILLNEED);

I just checked this in --- hope it's indeed correct ...

Stefan

? Otherwise (i.e., in the current case), both BATpreload_() & _BATpreload() only increment MT_mmap_tab[i].random, but never decrement it, right?

Stefan

...

• MT_mmap_tab[i].usecnt += preload; /* active thread count */
  

• if (preload > 0) (void) posix_madvise(base, len, advise);
  

  } (void) pthread_mutex_unlock(&MT_mmap_lock);

}