[PATCH] Set FILE_ATTRIBUTE_TEMPORARY on files opened by mkstemp() on WinNT
Fri Jul 22 10:28:00 GMT 2005
On Thu, 21 Jul 2005, Christopher Faylor wrote:
> On Fri, Jul 22, 2005 at 03:17:33AM +0200, Vaclav Haisman wrote:
> >On Thu, 21 Jul 2005, Christopher Faylor wrote:
> >>On Fri, Jul 22, 2005 at 01:32:50AM +0200, Vaclav Haisman wrote:
> >>>the attached patch sets FILE_ATTRIBUTE_TEMPORARY on files opened by
> >>>mkstemp() on WinNT class systems. Theoretically the OS should then be
> >>>less eager to write such files onto the physical storage and use cache
> >>Thank you for the patch but unless you can demonstrate some obvious
> >>performance improvements I don't think we'll be applying it. You've
> >>slowed down (slightly) the common case of calling open for the uncommon
> >>case of calling mk?temp.
> >I am not sure what kind of slow down do you mean. Is it the one extra
> It was more than one extra call, but yes.
> >In that case the attached modified patch should fix it. The call to
> >open_with_attributes() in open() gets inlined, I have checked the
> >resulting .s file.
> Can you demonstrate some obvious performance improvements? Does it
> speed up configure, make bash start up faster, make the rxvt window
> faster to show up?
I don't think that any of the extra ifs and assignments could cause any
measurable slowdown. I also do not think that there are any _obvious_ speed
ups. It is merely a hint to the cache subsystem, not a silver bullet.
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