[PERFORM] Server stalls, all CPU 100% system time

2013-02-24 Thread Andre
Hi, Since our upgrade of hardware, OS and Postgres we experience server stalls under certain conditions, during that time (up to 2 minutes) all CPUs show 100% system time. All Postgres processes show BIND in top. Usually the server only has a load of < 0.5 (12 cores) with up to 30 connections,

Re: [PERFORM] Server stalls, all CPU 100% system time

2013-02-24 Thread Andre
On 25/02/2013 12:13 AM, Bèrto ëd Sèra wrote: and your /etc/sysctl.conf is? /etc/sysctl.conf only had unrelated options set, here is the output of sysctl -a: abi.vsyscall32 = 1 debug.exception-trace = 1 dev.hpet.max-user-freq = 64 kernel.acct = 4230 kernel.acpi_video_flags = 0 kernel.

Re: [PERFORM] Server stalls, all CPU 100% system time

2013-02-26 Thread Andre
On 25/02/2013 12:45 AM, Tom Lane wrote: Odd. I wonder if you are seeing some variant of the old context swap storm problem. The "99.8% system time" reading is suggestive but hardly conclusive. Does top's report of context swap rate go to the moon? It would be interesting to strace a few of the ser

Re: [PERFORM] Server stalls, all CPU 100% system time

2013-02-27 Thread Andre
On 27/02/2013 9:29 AM, Josh Berkus wrote: Andre, Please see the related thread on this list, "High CPU usage / load average after upgrading to Ubuntu 12.04". You may be experiencing some of the same issues. General perspective seems to be that kernels 3.0 through 3.4 have serious p

[PERFORM] [pgsql-benchmarks] Error when try installing pgbench ?

2005-05-17 Thread Andre Nas
Hello … Im using source  postgresql 8.0.3 under FreeBSD and already install, the database is running well.   I want to install a pgbench, but I can’t install it, coz an error occur. I try to “make all” in directory ~/src/interfaces/lipq/ The messages are : . . . . . . . . . . "../../../src/Makef

[PERFORM] How to measure IO performance?

2008-09-09 Thread Andre Brandt
an handle our load or a bigger system is required. ) Do you have some suggestions, how to measure that? Do you have experience with postgres on something like HP MSA2000(10-20 disks) or RamSan systems? Best regards, Andre -- Sent via pgsql-performance mailing list (p

[PERFORM] problem with pg_statistics

2003-06-26 Thread Andre Schubert
Hi, i think i need a little help with a problem with pg_statistic. Lets say i have a table to collect traffic-data. The table has a column time_stamp of type timesamptz. The table has a single-column index on time_stamp. The table has around 5 million records. If i delete all statistical data fro

Re: [PERFORM] problem with pg_statistics

2003-06-26 Thread Andre Schubert
dex scan cost being more than 25 * seq scan cost, I guess that > > - all other things held equal - even random_page_cost = 1 wouldn't > > help. > > Oh, you're right, I was comparing the wrong estimated costs. Yeah, > changing random_page_cost won't fix it. >

Re: [PERFORM] problem with pg_statistics

2003-06-26 Thread Andre Schubert
dex scan cost being more than 25 * seq scan cost, I guess that > > - all other things held equal - even random_page_cost = 1 wouldn't > > help. > > Oh, you're right, I was comparing the wrong estimated costs. Yeah, > changing random_page_cost won't fix it. >

Re: [PERFORM] problem with pg_statistics

2003-06-27 Thread Andre Schubert
On Fri, 27 Jun 2003 10:43:01 +0200 Manfred Koizar <[EMAIL PROTECTED]> wrote: > On Fri, 27 Jun 2003 08:07:35 +0200, Andre Schubert > <[EMAIL PROTECTED]> wrote: > >Traffic data are inserted every 5 minutes with the actual datetime > >of the transaction, thatswhy the ta

Re: [PERFORM] firebird X postgresql 8.1.2 windows, performance comparison

2006-03-07 Thread Andre Felipe Machado
suitable to the available system ram. Thanks Andre Felipe ---(end of broadcast)--- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq

[PERFORM] firebird X postgresql 8.1.2 windows, performance comparison

2006-03-10 Thread Andre Felipe Machado
t tell postgresql to actually use windows disk cache. What parameter must be configured? Do you have some suggestions? Regards. Andre Felipe Machado www.techforce.com.br ---(end of broadcast)--- TIP 9: In versions below 8.0, the planner will i