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Postings from February 2012
On Fri, Feb 10, 2012 at 03:27:24PM +0000, Dave Mitchell wrote:
> On Thu, Jan 26, 2012 at 12:26:44PM +0000, Tim Bunce wrote:
>
> I attach two patches; the first replaces dPERINTERP with dMY_THX,
> while the second extends this to the DBIS stuff too.
>
> The headline figure (YMMV etc) is that on a recent threaded perl, these
> two patches collectively make my mysql empty test loop twice as fast!!! :
>
> while ($sth->fetch) { $c++ }
>
> On a perl < 5.10.0 (before dMY_THX was made much more efficient), the
> speedup is less spectacular, but is still about 25%.
That's great news!
> I'm assuming that these won't be applied until after the windows() fork
> issue is fixed, so think of this email more as a preview.
*nods*
> [...]
>
> If anyone knows of a more elegant way to make a function from DBI.xs
> available to DBD:: code, please let me know!
I hope to take a proper look in the next day or so.
> 1 2 3
> ----- ------ ------
> 40.10 - 29.96 5.8.9 threaded, optimised
> 37.62 33.98 18.96 5.15.7 threaded, optimised
>
> 12.85 - 12.55 5.8.9 unthreaded, optimised
> 13.41 13.46 12.97 5.15.6 unthreaded, optimised
Most excellent!
> The big saving between (2) and (3) is due to DBD::mysql still using DBIS;
> in particular, for every fetch call.
That should be a good reminder to driver authors to avoid using DBIS!
Thanks again Dave.
Tim.
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