I am confused about what the OS is reporting for memory usage on CentOS 5.3
Linux. Looking at the resident memory size of the processes. Looking at the
resident size of all postgres processes, the system should be using around 30Gb
of physical ram. I know that it states that it is using a lot of
But the kernel can take back any of the cache memory if it wants to. Therefore
it is free memory.
This still does not explain why the top command is reporting ~9GB of resident
memory, yet the top command does not suggest that any physical memory is being
used.
On 8/14/09 2:43 PM, "Reid Thomps
[mailto:sc...@richrelevance.com]
Sent: Friday, August 14, 2009 3:38 PM
To: Jeremy Carroll; pgsql-performance@postgresql.org
Subject: Re: [PERFORM] Memory reporting on CentOS Linux
On 8/14/09 11:00 AM, "Jeremy Carroll"
wrote:
> I am confused about what the OS is reporting for memory usag
olumn "-/+ buffers/cache:". That shows 46Gb Free RAM.
I cannot be the only person that has asked this question.
-Original Message-
From: Tom Lane [mailto:t...@sss.pgh.pa.us]
Sent: Saturday, August 15, 2009 10:25 AM
To: Jeremy Carroll
Cc: Scott Carey; pgsql-performance@postgresql.
I believe this is exactly what is happening. I see that the TOP output lists a
large amount ov VIRT & RES size being used, but the kernel does not report this
memory as being reserved and instead lists it as free memory or cached.
If this is indeed the case, how does one determine if a PostgreSQ
