On Sat, 17 Apr 2004, Lachlan Andrew wrote:
> Date: Sat, 17 Apr 2004 10:04:10 +1000
> From: Lachlan Andrew <[EMAIL PROTECTED]>
> To: Joe R. Jah <[EMAIL PROTECTED]>
> Cc: [EMAIL PROTECTED]
> Subject: Re: Profile
>
> Greetings Joe / all,
>
> Another question: Were you using compression? Phillippe Andersson
compression_level: 6
> reported a reduction from 30 hours to 22 hours by removing
> compression. Since compression should reduce the disk access, it
I have done different compression levels in the past, but I haven't
observed any appreciable difference in indexing time. I believe high
compressing in memory is less expensive than the extra writing to disk.
> seems that it should be taking about 30% of the CPU time. However,
> the profile didn't report any time in compression (or the DB code at
> all, as far as I could see).
Machines are different; I believe:
Slow_CPU/Fast_Disk: Lower compression -> Faster index
Fast_CPU/Slow_Disk: Higher compression -> Faster index
Regards,
Joe
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