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Re: OSDL DBT-2 w/ PostgreSQL 7.3.4 and 7.4beta5

From: Manfred Spraul <manfred(at)colorfullife(dot)com>
To: markw(at)osdl(dot)org
Cc: pgsql-hackers(at)postgresql(dot)org,osdldbt-general(at)lists(dot)sourceforge(dot)net
Subject: Re: OSDL DBT-2 w/ PostgreSQL 7.3.4 and 7.4beta5
Date: 2003-11-01 10:44:35
Message-ID: 3FA38E93.3040502@colorfullife.com (view raw or flat)
Thread:
Lists: pgsql-hackers
markw(at)osdl(dot)org wrote:

>Results from 7.4beta5
>	http://developer.osdl.org/markw/dbt2-pgsql/188/
>	- metric 1446.01
>  
>

CPU: P4 / Xeon with 2 hyper-threads, speed 1497.51 MHz (estimated)
Counted GLOBAL_POWER_EVENTS events (time during which processor is not stopped) with a unit mask of 0x01 (count cycles when processor is active) count 100000
samples  %        app name                 symbol name
15369575  9.6780  postgres                 SearchCatCache
13714258  8.6357  vmlinux                  .text.lock.signal
10611912  6.6822  vmlinux                  do_sigaction
4400461   2.7709  vmlinux                  rm_from_queue

18% cpu time in the kernel signal handlers.

What are signals used for by postgres? I've seen the sigalarm to 
implement timeouts, what else?

--
    Manfred


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