Re: Troubles with performances

Lamar Owen wrote:
>
> /*
> * _SHM_ID_BITS + _SHM_IDX_BITS must be <= 24 on the i386 and
> * SHMMAX <= (PAGE_SIZE << _SHM_IDX_BITS).
> */
>
> #define SHMMAX 0x2000000 /* max shared seg size (bytes)
> */
> /* Try not to change the default shipped SHMMAX - people rely on it */
>
> -------
>
> Hmmmm....
>
> Looks pretty difficult to change.

echo 134217728 >/proc/sys/kernel/shmmax

set's the maximum allowed segment! size to 128M. Shared
memory under Linux can be swapped, so if you have 256M
physical and run 3 postmasters, you can start all of them
with 64M (or more) and while they're idle they most likey
consume some swap space. But when it poors, they'll grab the
memory they need.

Jan

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