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Re: Wierd context-switching issue on Xeon patch for 7.4.1

From: Dave Cramer <pg(at)fastcrypt(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Wierd context-switching issue on Xeon patch for 7.4.1
Date: 2004-04-27 00:16:00
Message-ID: 1083024960.14759.166.camel@localhost.localdomain (view raw or flat)
Thread:
Lists: pgsql-performance
Are you testing this with Tom's code, you need to do a baseline
measurement with 10 and then increase it, you will still get lots of cs,
but it will be less.

Dave
On Mon, 2004-04-26 at 20:03, Josh Berkus wrote:
> Dave,
> 
> > Yeah, I did some more testing myself, and actually get better numbers
> > with increasing spins per delay to 1000, but my suspicion is that it is
> > highly dependent on finding the right delay for the processor you are
> > on.
> 
> Well, it certainly didn't help here:
> 
> procs                      memory      swap          io     system         cpu
>  r  b   swpd   free   buff  cache   si   so    bi    bo   in    cs us sy id wa
>  2  0      0 14870744 123872 1129912    0    0     0     0 1027 187341 48 27 
> 26  0
>  2  0      0 14869912 123872 1129912    0    0     0    48 1030 126490 65 18 
> 16  0
>  2  0      0 14867032 123872 1129912    0    0     0     0 1021 106046 72 16 
> 12  0
>  2  0      0 14869912 123872 1129912    0    0     0     0 1025 90256 76 14 10  
> 0
>  2  0      0 14870424 123872 1129912    0    0     0     0 1022 135249 63 22 
> 16  0
>  2  0      0 14872664 123872 1129912    0    0     0     0 1023 131111 63 20 
> 17  0
>  1  0      0 14871128 123872 1129912    0    0     0    48 1024 155728 57 22 
> 20  0
>  2  0      0 14871128 123872 1129912    0    0     0     0 1028 189655 49 29 
> 22  0
>  2  0      0 14871064 123872 1129912    0    0     0     0 1018 190744 48 29 
> 23  0
>  2  0      0 14871064 123872 1129912    0    0     0     0 1027 186812 51 26 
> 23  0
-- 
Dave Cramer
519 939 0336
ICQ # 14675561


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Subject: Re: [PERFORM] is a good practice to create an index on the oid?
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Subject: Re: Wierd context-switching issue on Xeon patch for 7.4.1

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