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On Tue, 19 Feb 2008 18:54:38 -0800
Luke Lonergan <llonergan@greenplum.com> wrote:
> Bah.
>
> It's the stuff in the format translation path and conversion to/from
> datums that is the bottleneck.
So how do we fix that? This performance is pretty anemic.
>
> We sped up COPY TO recently by a factor of 10 using similar
> approaches to what we did for COPY FROM in the past. There's a
> format conversion that is the culprit.
Any chance that code (in whatever shape) could be released for review
of applicability to core?
>
> We routinely get about 12 MB/s of heap insertion rate per CPU core
> and it's CPU bound.
That's embarrassing on today's hardware don't you think? Or am I missing
something entirely?
>
> You can peek in on what's happening using gstack on Linux, or the gdb
> "attach and print stacktrace" approach for a crude profile.
>
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?
Sincerely,
Joshua D. Drake
- --
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PostgreSQL SPI Liaison | SPI Director | PostgreSQL political pundit
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