| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
| Cc: | Luke Lonergan <llonergan(at)greenplum(dot)com>, Greg Smith <gsmith(at)gregsmith(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: 8.3 / 8.2.6 restore comparison |
| Date: | 2008-02-22 17:39:57 |
| Message-ID: | 5641.1203701997@sss.pgh.pa.us |
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| Thread: | |
| Lists: | pgsql-hackers |
"Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
> Yeah, that... is beyond my abilities. Well reading it is anyway. I can
> provide any information people want though. Tom? Greg? Andrew? Somebody?
> What information do you want from me to help you track this down?
The vmstat output you showed before said user CPU time was only around
12%, which seems to destroy Luke's thesis that data conversion time
is the problem. IIRC we were speculating that data was being written
in a pattern that required a lot of seeking thus ruining throughput,
but we didn't have any hard evidence of that. Did you do the strace'ing
I suggested?
regards, tom lane
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