| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> |
| Cc: | pgsql-performance(at)postgresql(dot)org, Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Subject: | Re: Re: [HACKERS] [COMMITTERS] pgsql: Fix TransactionIdIsCurrentTransactionId() to use binary search |
| Date: | 2008-04-26 17:26:44 |
| Message-ID: | 13180.1209230804@sss.pgh.pa.us |
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| Lists: | pgsql-committers pgsql-hackers pgsql-performance |
Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> writes:
> On Friday 25 April 2008 17:32, Tom Lane wrote:
>> Robert Treat <xzilla(at)users(dot)sourceforge(dot)net> writes:
>>> Oddly some dtrace profiling gave me this, which is pretty different, but
>>> certainly doesn't have concerns about TransactionIdIsCurrentTransactionId
>>
>> .... which seems to pretty much destroy your thesis, no?
> How so? Before the patch we bog down for hours, spending 99% of our time in
> TransactionIdIsCurrentTransactionId, after the patch everything performs well
> (really better than before) and we spend so little time in
> TransactionIdIsCurrentTransactionId it barely shows up on the radar.
Oh, you failed to state that the dtrace output was post-patch. You need
to show *pre* patch dtrace output if you want us to think it relevant.
regards, tom lane
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