| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
| Cc: | Michael Paesold <mpaesold(at)gmx(dot)at>, hubert depesz lubaczewski <depesz(at)gmail(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: problem with large maintenance_work_mem settings and |
| Date: | 2006-03-05 20:15:03 |
| Message-ID: | 16339.1141589703@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> writes:
> samples % symbol name
> 24915704 96.2170 ltsReleaseBlock
> 387265 1.4955 LogicalTapeRead
> 168725 0.6516 inlineApplySortFunction
Hmm ... the comment in ltsReleaseBlock sez
/*
* Insert blocknum into array, preserving decreasing order (so that
* ltsGetFreeBlock returns the lowest available block number). This could
* get fairly slow if there were many free blocks, but we don't expect
* there to be very many at one time.
*/
We probably need to tweak things so this doesn't get called during the
"final merge" pass. Looking at it now.
regards, tom lane
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