MySQL Performance 6.0rc1
David Xu
davidxu at freebsd.org
Thu Oct 27 01:29:25 PDT 2005
Poul-Henning Kamp wrote:
> In message <43607DD5.3020708 at freebsd.org>, David Xu writes:
>
>
>>Check gettimeofday syscall, it follows every I/O syscall, I think
>>our gettimeofday is tooooooo expensive, if we can directly get time from
>>memory, the performance will be improved further.
>
>
> Why would anybody take a timestamp at all I/O syscalls ?
>
> "I wonder why my car can only go 30 km/h with the trunk full of concrete" ?
>
> In a data base application I could possibly understand a timestamp
> after every write.
>
> But after _all_ I/O syscalls ? That's just plain stupid...
>
Don't panic, I agree that is stupid code, but I can not change it, it
is not written by me, sorry!
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