RE: Virtual Memory

David,

How did you measure this free real memory and virtual memory? Which columns from which tools output?

A decent OS shouldn't start paging much before it starts running out of physical memory, but there are few things which could affect this. Solaris zones could be one thing I guess.

As solaris /tmp filesystem is usually a in-memory filesystem which can be paged out to pagefile, then maybe this is your issue - check if you got a lot of files in /tmp filesystem.

Tanel.

> -----Original Message-----
> From: oracle-l-bounce_at_freelists.org
> [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of David Turner
> Sent: Friday, August 25, 2006 23:14
> To: oracle-l_at_freelists.org
> Subject: Virtual Memory
>
>
> We have a system with swap less than half the size I would
> like, 5 GB swap with 8 GB real. Last week we started to run
> out of virtual memory while real memory usage was still low.
> There was only 400 MB virtual memory remaining but 2 GB real
> memory available. What I'm curious about is if we run out of
> virtual memory will the system be affected or will it just
> start using more of the real memory. When I asked one person
> he said we could still run out of kernel resources and I
> asked him to elaborate but haven't heard back. If anyone can
> shed light on how the system would handle the situation I
> would appreciate it. Also we plan on rebuilding swap with 1.5
> times real memory as a standard. Does anyone else have a
> standard they follow for allocating swap?
>
> We are running on Solaris 2.9.
>
> Thx, Dave
>

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