[Monetdb-developers] Re : mclient running out of memory, crashing mserver5

Stefan Manegold Stefan.Manegold at cwi.nl
Wed Jan 21 11:28:41 CET 2009


On Wed, Jan 21, 2009 at 02:07:04AM -0800, sylver_b wrote:
> Hi 
> 
> Interesting..
> 
> Even worst, this morning i found out that all the inserts of last night failed !! :(
> 
> 
> #BBPTRIM_ENTER: memsize=1144385432,vmsize=1599613808
> #BBPTRIM: memtarget=819717481 vmtarget=0
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1599605544
> #BBPTRIM_ENTER: memsize=1173710640,vmsize=1628939016
> #BBPTRIM: memtarget=849042689 vmtarget=0
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1628939016
> #BBPTRIM_ENTER: memsize=1143635024,vmsize=1629665320
> #BBPTRIM: memtarget=0 vmtarget=19052584
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1598862320
> #BBPTRIM_ENTER: memsize=1143633968,vmsize=1645786120
> #BBPTRIM: memtarget=0 vmtarget=35173384
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1645786120
> #BBPTRIM_ENTER: memsize=1143633992,vmsize=1676588064
> #BBPTRIM: memtarget=0 vmtarget=65975328
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1598862320
> #BBPTRIM_ENTER: memsize=1143633944,vmsize=1613149168
> #BBPTRIM: memtarget=0 vmtarget=2536432
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1582347224
> #BBPTRIM_ENTER: memsize=1143633920,vmsize=1620095960
> #BBPTRIM: memtarget=0 vmtarget=9483224
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1620095960
> #GDKmmap(148111360) fail => BBPtrim(enter) usage[mem=1143633920,vm=1496757208]
> #BBPTRIM_ENTER: memsize=1143633920,vmsize=1496757208
> #BBPTRIM: memtarget=0 vmtarget=1073741824
> #BBPTRIM_EXIT: memsize=366265384,vmsize=1496757208
> #GDKmmap(148111360) fail => BBPtrim(ready) usage[mem=1143633920,vm=1496757208]
> !ERROR: GDKload: cannot mmap(): name=32/3267, ext=theap
> !OS: Cannot allocate memory
> !ERROR: GDKload: failed name=32/3267, ext=theap
> 
> top - 10:00:34 up 249 days, 20:31,  4 users,  load average: 0.28, 0.12, 0.04
> Tasks:  86 total,   1 running,  85 sleeping,   0 stopped,   0 zombie
> Cpu(s):  0.0%us,  0.0%sy,  0.0%ni,100.0%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
> Mem:   4025600k total,  3633228k used,   392372k free,   107544k buffers
> Swap:  9502408k total,       92k used,  9502316k free,  1520104k cached

Is that after mserver5 had crashed?

How big is/was your mserver5 when running or just before crashing?

Your machine and OS seem to be 64-bit, right?

What about your MonetDB installation?
Could you please provide us with the output of
	`mserver5 --version`
?

How much free space is on your disk partition where your dbfarm is located?

> Is there anything to do to prevent this ? should the DB swap at all ?

MonetDB does in-memory processing, i.e., all columns that are active at a time
need to be in the processes address space, either being loaded or being
memory mapped; so yes, with huge amount of data MonetDB will also use
virtual memory, either as swap or as memory-mapped files.

Stefan

> 
> 
> 
> 
> 
> ________________________________
> De : Stefan de Konink <stefan at konink.de>
> À : sylver_b <sylver_b at yahoo.com>
> Cc : monetdb-developers at lists.sourceforge.net
> Envoyé le : Mercredi, 21 Janvier 2009, 1h09mn 13s
> Objet : Re: [Monetdb-developers] mclient running out of memory, crashing mserver5
> 
> sylver_b wrote:
> > I don't think i'm running out of memory. I had to stop and restart mserver5, flush the table, then re-run the command - all the records were inserted. Also I noticed this type of messages on the mserver5 console when piping records through the mclient (over 1million records) . It seems that the mclient is quiet instable (cf my post about "COPY, terminating connection" few months ago).
> >  So, is there a way to increase the memory limit  or make sure mserver5 won't crash when running bash inserts via a cron job ?
> 
> The only thing I was able to do against that; more swap for the job. And of course the standard stuff as loading CSV files, preferably no indices on the table you are loading huge amounts of data to.
> 
> 
> Stefan
> 
> 
> 
>       
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| Dr. Stefan Manegold | mailto:Stefan.Manegold at cwi.nl |
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