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Postings from July 2002
At 6:59 PM +0100 6/30/02, Tom Hughes wrote:
>There is a performance issue in the stack code, which the attached
>patch attempts to address.
[Snip]
>Some figures from my test programs, running on a K6-200 linux box. The
>test programs push and pop 65536 times with the first column being when
>that loop doesn't cross a chunk boundary and the second being when it
>does cross a chunk boundary:
>
> No overflow Overflow
> Integer stack, before patch 0.065505s 16.589480s
> Integer stack, after patch 0.062732s 0.068460s
> Generic stack, before patch 0.161202s 5.475367s
> Generic stack, after patch 0.166938s 0.168390s
Yowtch! Go for it, though please make some comments in the code to
the effect that the pointer to the next (unused) chunk should be
invalidated if things get marked COW.
--
Dan
--------------------------------------"it's like this"-------------------
Dan Sugalski even samurai
dan@sidhe.org have teddy bears and even
teddy bears get drunk
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