| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | Luke Lonergan <llonergan(at)greenplum(dot)com> |
| Cc: | Andrew Dunstan <andrew(at)dunslane(dot)net>, Ben Gould <ben(dot)gould(at)free(dot)fr>, PostgreSQL-patches <pgsql-patches(at)postgresql(dot)org> |
| Subject: | Re: [BUGS] BUG #2114: (patch) COPY FROM ... end of |
| Date: | 2005-12-28 03:27:57 |
| Message-ID: | 200512280327.jBS3RvC27705@candle.pha.pa.us |
| Views: | Whole Thread | Raw Message | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-bugs pgsql-patches |
Luke Lonergan wrote:
> Bruce,
>
> On 12/27/05 10:20 AM, "Bruce Momjian" <pgman(at)candle(dot)pha(dot)pa(dot)us> wrote:
>
> > OK, original patch applied to HEAD and smaller version to 8.1.X, and
> > regression test added, now attached.
>
> Great, good catch.
>
> Have you tested performance, before and after?
>
> The only good way to test performance is using a fast enough I/O subsystem
> that you are CPU-bound, which means >60MB/s of write speed.
>
> I'd be happy to get you an account on one.
I don't need to test performance because it is the same code, just with
macros and the two functions merged. I do have an optimization for that
loop but I saw no improvement so I didn't apply it. It was basically to
advance the pointer in a tight look just checking for \r, \n, and \\,
but it seems the larger loop isn't much slower than a tight one.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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