Re: Memory Problem

[Nicolas Michel <nicolas.michel@xxxxxxxxx>]

Thank you very much. I didn't know that. I set my shmmax to 4000000000 but you're right, we will see to use a 64 bits system ;)

Le vendredi 03 avril 2009 à 12:37 +0200, Thomas Markus a écrit :
> hi,
>
> i assume you have a 32bit system so you cant set shmmax to 4gb. as a 
> side effect your value 4294967296 in a binary 32bit representation is 
> exactly 0. look for previous threads about shmmax. and use a 64bit system :)
>
> regards
> thomas
>
> Nicolas Michel schrieb:
> > Hi here,
> >
> > Our server had 2GB of RAM. We added some memory to have 16GB. We are 
> > on a debian etch. I installed the "bigmem" kernel to use the all memory :
> >
> >     ~# cat /proc/meminfo
> >     MemTotal:     16573232 kB
> >     MemFree:      15448836 kB
> >     Buffers:        133772 kB
> >     Cached:         445388 kB
> >     SwapCached:          0 kB
> >     Active:         782764 kB
> >     Inactive:       302760 kB
> >     HighTotal:    15794120 kB
> >     HighFree:     14838384 kB
> >     LowTotal:       779112 kB
> >     LowFree:        610452 kB
> >     SwapTotal:     2658716 kB
> >     SwapFree:      2658716 kB
> >     Dirty:             452 kB
> >     Writeback:           4 kB
> >     AnonPages:      506336 kB
> >     Mapped:         126524 kB
> >     Slab:            27620 kB
> >     PageTables:       3036 kB
> >     NFS_Unstable:        0 kB
> >     Bounce:              0 kB
> >     CommitLimit:  10945332 kB
> >     Committed_AS:  2187952 kB
> >     VmallocTotal:   118776 kB
> >     VmallocUsed:      3716 kB
> >     VmallocChunk:   114640 kB
> >
> >
> > I wanted to give to postgres 4GB. So I tryied to set shmmax to 4Go :
> >
> >     sysctl kernel.shmmax=4294967296
> >
> >
> > But it doesn't work : if I launch after this modification this command :
> >
> >     sysctl kernel.shmmax
> >
> > it gives me this response :
> >
> >     kernel.shmmax = 0
> >
> > Why? Is there a limit to shmmax?