Re: Upgrade to dual processor machine?

hi Ivan

to get the shared buffer memory I followed all the instructions
I gathered here on the list within the last two days. the kernel
settings SHMMAX etc. were important here in my opinion... you could
search the archives for all the other mails within this thread and
try yourself.

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?

the kernel is much more performant!

--

Mit freundlichem Gruß

Henrik Steffen
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top concepts Internetmarketing GmbH
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----- Original Message -----
From: "pginfo" <pginfo(at)t1(dot)unisoftbg(dot)com>
To: "Henrik Steffen" <steffen(at)city-map(dot)de>
Sent: Thursday, November 14, 2002 3:15 PM
Subject: Re: [GENERAL] Upgrade to dual processor machine?

> Hi,
> Sorry for this question.
> I see you have 8520K shrd .
> How are you setup you linux box to use tis shared buffers? (any answer will be great).
>
>
>
> I have tryed it many times without success.
>
> Also it is courios that the sum of cpu loading is not 100% !
>
> We are using two pg servers:
> one single processor Intel 1 GHz, 1 GB RAM,
> and one dual Intel 1GHz, 1.5 GB RAM.
> It exist big diference in pg performance and I noticed many times when the system use
> all two processors.
>
> If I can help you with more info you are free to ask.
>
> regards,
> Ivan.
>
>
> Henrik Steffen wrote:
>
> > dear shridhar,
> >
> > > Yes. 2*max connection is minimum. Anything additional is always welcome as long
> > > as it does not starve the system.
> >
> > ok, I tried to set shared_buffers to 65535 now. but then restarting postgres
> > fails - it says:
> >
> > IpcMemoryCreate: shmget(key=5432001, size=545333248, 03600) failed: Invalid argument
> >
> > and a message telling me to either lower the shared_buffers or raise the
> > SHMMAX.
> >
> > > If you have a gig of memory and shared buffers are 536MB as you have indicated,
> > > who is taking rest of the RAM?
> >
> > well, I guess it's postgres... see the output of top below:
> >
> > 11:06am up 1 day, 16:46, 1 user, load average: 1,32, 1,12, 1,22
> > 53 processes: 52 sleeping, 1 running, 0 zombie, 0 stopped
> > CPU states: 24,5% user, 11,2% system, 0,0% nice, 5,6% idle
> > Mem: 1020808K av, 1006156K used, 14652K free, 8520K shrd, 37204K buff
> > Swap: 1028112K av, 60K used, 1028052K free 849776K cached
> >
> > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> > 10678 root 19 0 2184 2184 1584 S 2,9 0,2 0:00 sendmail
> > 1 root 8 0 520 520 452 S 0,0 0,0 0:03 init
> > 2 root 9 0 0 0 0 SW 0,0 0,0 0:00 keventd
> > 3 root 9 0 0 0 0 SW 0,0 0,0 0:00 kapm-idled
> > 4 root 19 19 0 0 0 SWN 0,0 0,0 0:00 ksoftirqd_CPU0
> > 5 root 9 0 0 0 0 SW 0,0 0,0 0:28 kswapd
> > 6 root 9 0 0 0 0 SW 0,0 0,0 0:00 kreclaimd
> > 7 root 9 0 0 0 0 SW 0,0 0,0 0:09 bdflush
> > 8 root 9 0 0 0 0 SW 0,0 0,0 0:00 kupdated
> > 9 root -1 -20 0 0 0 SW< 0,0 0,0 0:00 mdrecoveryd
> > 13 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 136 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 137 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 138 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 139 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 140 root 9 0 0 0 0 SW 0,0 0,0 2:16 kjournald
> > 378 root 9 0 0 0 0 SW 0,0 0,0 0:00 eth0
> > 454 root 9 0 572 572 476 S 0,0 0,0 0:00 syslogd
> > 459 root 9 0 1044 1044 392 S 0,0 0,1 0:00 klogd
> > 572 root 8 0 1128 1092 968 S 0,0 0,1 0:07 sshd
> > 584 root 9 0 1056 1056 848 S 0,0 0,1 0:02 nlservd
> > 611 root 8 0 1836 1820 1288 S 0,0 0,1 0:00 sendmail
> > 693 root 9 0 640 640 556 S 0,0 0,0 0:00 crond
> > 729 daemon 9 0 472 464 404 S 0,0 0,0 0:00 atd
> > 736 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 737 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 738 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 739 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 740 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 741 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 9800 root 9 0 1888 1864 1552 S 0,0 0,1 0:02 sshd
> > 9801 root 16 0 1368 1368 1016 S 0,0 0,1 0:00 bash
> > 10574 postgres 0 0 1448 1448 1380 S 0,0 0,1 0:00 postmaster
> > 10576 postgres 9 0 1436 1436 1388 S 0,0 0,1 0:00 postmaster
> > 10577 postgres 9 0 1480 1480 1388 S 0,0 0,1 0:00 postmaster
> > 10579 postgres 14 0 11500 11M 10324 S 0,0 1,1 0:08 postmaster
> > 10580 postgres 9 0 11672 11M 10328 S 0,0 1,1 0:03 postmaster
> > 10581 postgres 14 0 11620 11M 10352 S 0,0 1,1 0:08 postmaster
> > 10585 postgres 11 0 11560 11M 10304 S 0,0 1,1 0:08 postmaster
> > 10588 postgres 9 0 11520 11M 10316 S 0,0 1,1 0:14 postmaster
> > 10589 postgres 9 0 11632 11M 10324 S 0,0 1,1 0:06 postmaster
> > 10590 postgres 10 0 11620 11M 10320 S 0,0 1,1 0:06 postmaster
> > 10591 postgres 9 0 11536 11M 10320 S 0,0 1,1 0:08 postmaster
> > 10592 postgres 11 0 11508 11M 10316 S 0,0 1,1 0:04 postmaster
> > 10595 postgres 9 0 11644 11M 10324 S 0,0 1,1 0:03 postmaster
> > 10596 postgres 11 0 11664 11M 10328 S 0,0 1,1 0:08 postmaster
> > 10597 postgres 9 0 11736 11M 10340 S 0,0 1,1 0:24 postmaster
> > 10598 postgres 9 0 11500 11M 10312 S 0,0 1,1 0:10 postmaster
> > 10599 postgres 11 0 11676 11M 10324 S 0,0 1,1 0:13 postmaster
> > 10602 postgres 9 0 11476 11M 10308 S 0,0 1,1 0:09 postmaster
> > 10652 postgres 9 0 7840 7840 7020 S 0,0 0,7 0:00 postmaster
> > 10669 postgres 9 0 9076 9076 8224 S 0,0 0,8 0:00 postmaster
> > 10677 root 13 0 1032 1028 828 R 0,0 0,1 0:00 top
> >
> > I have now changed the SHMMAX settings to 545333248 and changed the
> > shared_buffers to 65535 again. now postgres starts up correctly.
> >
> > the top result changes to:
> >
> > 11:40am up 1 day, 17:20, 1 user, load average: 2,24, 2,51, 2,14
> > 57 processes: 55 sleeping, 2 running, 0 zombie, 0 stopped
> > CPU states: 24,7% user, 11,3% system, 0,0% nice, 6,2% idle
> > Mem: 1020808K av, 1015844K used, 4964K free, 531420K shrd, 24796K buff
> > Swap: 1028112K av, 60K used, 1028052K free 338376K cached
> >
> > PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> > 11010 root 17 0 1036 1032 828 R 14,2 0,1 0:00 top
> > 11007 postgres 14 0 14268 13M 12668 R 9,7 1,3 0:00 postmaster
> > 11011 root 9 0 2184 2184 1584 S 3,0 0,2 0:00 sendmail
> > 1 root 8 0 520 520 452 S 0,0 0,0 0:03 init
> > 2 root 9 0 0 0 0 SW 0,0 0,0 0:00 keventd
> > 3 root 9 0 0 0 0 SW 0,0 0,0 0:00 kapm-idled
> > 4 root 19 19 0 0 0 SWN 0,0 0,0 0:00 ksoftirqd_CPU0
> > 5 root 9 0 0 0 0 SW 0,0 0,0 0:29 kswapd
> > 6 root 9 0 0 0 0 SW 0,0 0,0 0:00 kreclaimd
> > 7 root 9 0 0 0 0 SW 0,0 0,0 0:09 bdflush
> > 8 root 9 0 0 0 0 SW 0,0 0,0 0:00 kupdated
> > 9 root -1 -20 0 0 0 SW< 0,0 0,0 0:00 mdrecoveryd
> > 13 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 136 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 137 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 138 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 139 root 9 0 0 0 0 SW 0,0 0,0 0:00 kjournald
> > 140 root 9 0 0 0 0 SW 0,0 0,0 2:18 kjournald
> > 378 root 9 0 0 0 0 SW 0,0 0,0 0:00 eth0
> > 454 root 9 0 572 572 476 S 0,0 0,0 0:00 syslogd
> > 459 root 9 0 1044 1044 392 S 0,0 0,1 0:00 klogd
> > 572 root 8 0 1128 1092 968 S 0,0 0,1 0:07 sshd
> > 584 root 9 0 1056 1056 848 S 0,0 0,1 0:02 nlservd
> > 611 root 9 0 1836 1820 1288 S 0,0 0,1 0:00 sendmail
> > 693 root 9 0 640 640 556 S 0,0 0,0 0:00 crond
> > 729 daemon 9 0 472 464 404 S 0,0 0,0 0:00 atd
> > 736 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 737 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 738 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 739 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 740 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 741 root 9 0 448 448 384 S 0,0 0,0 0:00 mingetty
> > 9800 root 9 0 1888 1864 1552 S 0,0 0,1 0:03 sshd
> > 9801 root 10 0 1368 1368 1016 S 0,0 0,1 0:00 bash
> > 10838 postgres 7 0 6992 6992 6924 S 0,0 0,6 0:00 postmaster
> > 10840 postgres 9 0 6984 6984 6932 S 0,0 0,6 0:00 postmaster
> > 10841 postgres 9 0 7024 7024 6932 S 0,0 0,6 0:00 postmaster
> > 10852 postgres 9 0 489M 489M 487M S 0,0 49,0 0:32 postmaster
> > 10869 postgres 9 0 357M 357M 356M S 0,0 35,8 0:21 postmaster
> > 10908 postgres 9 0 263M 263M 262M S 0,0 26,4 0:20 postmaster
> > 10909 postgres 9 0 283M 283M 281M S 0,0 28,4 0:19 postmaster
> > 10932 postgres 9 0 288M 288M 286M S 0,0 28,9 0:13 postmaster
> > 10946 postgres 9 0 213M 213M 211M S 0,0 21,4 0:06 postmaster
> > 10947 postgres 9 0 239M 239M 238M S 0,0 24,0 0:07 postmaster
> > 10948 postgres 9 0 292M 292M 290M S 0,0 29,2 0:09 postmaster
> > 10957 postgres 9 0 214M 214M 212M S 0,0 21,5 0:10 postmaster
> > 10964 postgres 9 0 58156 56M 56400 S 0,0 5,6 0:05 postmaster
> > 10974 postgres 9 0 50860 49M 49120 S 0,0 4,9 0:04 postmaster
> > 10975 postgres 9 0 209M 209M 207M S 0,0 21,0 0:04 postmaster
> > 10976 postgres 9 0 174M 174M 172M S 0,0 17,5 0:08 postmaster
> > 10977 postgres 9 0 52484 51M 50932 S 0,0 5,1 0:05 postmaster
> > 10990 postgres 9 0 199M 199M 197M S 0,0 19,9 0:06 postmaster
> > 10993 postgres 9 0 141M 141M 139M S 0,0 14,1 0:01 postmaster
> > 10998 postgres 9 0 181M 181M 180M S 0,0 18,2 0:04 postmaster
> > 10999 postgres 9 0 139M 139M 138M S 0,0 14,0 0:01 postmaster
> > 11001 postgres 9 0 45484 44M 43948 S 0,0 4,4 0:01 postmaster
> > 11006 postgres 9 0 15276 14M 13952 S 0,0 1,4 0:00 postmaster
> >
> > now, does this look better in your eyes?
> >
> > > What are your current settings? Could you please repost. I lost earlier
> > > thread(Sorry for that.. Had a HDD meltdown here couple of days back. Lost few
> > > mails..)
> >
> > do you need more information here?
> >
> > ---------------------------(end of broadcast)---------------------------
> > TIP 6: Have you searched our list archives?
> >
> > http://archives.postgresql.org
>
>
>