| From: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz> |
|---|---|
| To: | Dennis Gearon <gearond(at)cvc(dot)net> |
| Cc: | pgsql-general(at)postgresql(dot)org |
| Subject: | Re: qsort (was Re: Solaris) |
| Date: | 2003-05-02 08:07:58 |
| Message-ID: | 3EB2275E.505@paradise.net.nz |
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| Thread: | |
| Lists: | pgsql-general |
Dennis Gearon wrote:
>The trend has been approx:
>
> On Linux
> BSD qsort is 30-55% faster on average.
> On Non Liux
> BSD qsort it 50-90% on average.
>
>This kind of says that Linux is doing something right in the kernal,
>outdoing mainframe software in this sort of thing.
>
The difference may be due to GNU and HP using different qsort algorithm
tweeks. Consider :
+ HPUX vs BSD - very different for random*mod, close for i / (ITEMS /
mod).
+ Linux vs BSD - reasonably different for all 4 cases.
(Only way to tell would be to eyeball HP's qsort code...I am not sure if
thats possible)
regards
Mark
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