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Re: [PERFORM] Upgrade to dual processor machine?

From: "Henrik Steffen" <steffen(at)city-map(dot)de>
To: "Shridhar Daithankar" <shridhar_daithankar(at)persistent(dot)co(dot)in>
Cc: <pgsql-general(at)postgresql(dot)org>,<pgsql-performance(at)postgresql(dot)org>
Subject: Re: [PERFORM] Upgrade to dual processor machine?
Date: 2002-11-14 15:31:29
Message-ID: 007501c28bf2$e70f95e0$7100a8c0@STEINKAMP (view raw or flat)
Thread:
Lists: pgsql-generalpgsql-performance
hi,

this is what it look like right now... looks like 69 MB of shared memory...

------ Shared Memory Segments --------
key        shmid      owner      perms      Bytes      nattch     Status
0x0052e2c1 131072     postgres  600        69074944   19

------ Semaphore Arrays --------
key        semid      owner      perms      nsems      Status
0x0052e2c1 655360     postgres  600        17
0x0052e2c2 688129     postgres  600        17
0x0052e2c3 720898     postgres  600        17

------ Message Queues --------
key        msqid      owner      perms      used-bytes   messages

--

Mit freundlichem Gruß

Henrik Steffen
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----- Original Message -----
From: "Shridhar Daithankar" <shridhar_daithankar(at)persistent(dot)co(dot)in>
To: "Henrik Steffen" <steffen(at)city-map(dot)de>
Sent: Thursday, November 14, 2002 4:25 PM
Subject: Re: [PERFORM] [GENERAL] Upgrade to dual processor machine?


> On Thursday 14 November 2002 08:50 pm, you wrote:
> > by the way: today we update to kernel 2.4.19 and we measured BIG
> > performance gains! however, since the upgrade 'top' doesn't show any
> > shared memory in the summary any longer... yet for every process
> > it lists a certain amount of shared mem... is this a kernel/top issue
> > or did I miss something here?
>
> No. The shared memory accounting is turned off because it is seemingly much
> complex. Process do share memory.  Check output of ipcs as root..
>
>  Shridhar


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