Re: Memory Problem

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?