Date: Fri, 28 Oct 2005 14:03:38 +1300 From: Mark Kirkwood <markir@paradise.net.nz> To: Chuck Swiger <cswiger@mac.com> Cc: current@freebsd.org Subject: Re: Timers and timing, was: MySQL Performance 6.0rc1 Message-ID: <436178EA.5020603@paradise.net.nz> In-Reply-To: <43616A73.7030709@mac.com> References: <21137.1130401220@critter.freebsd.dk> <00a801c5dacf$db3b7700$6504010a@Jura> <43613541.7030009@mac.com> <43615BBB.2080702@paradise.net.nz> <43616A73.7030709@mac.com>
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Chuck Swiger wrote:
> Mark Kirkwood wrote:
>
>> Chuck Swiger wrote:
>>
>>> FreeBSD 5.4-STABLE i386
>>> null function: 0.01278
>>> getpid(): 0.51329
>>> time(): 2.54771
>>> gettimeofday(): 2.54982
>>>
>>
>> Chuck - very interesting results. I happen to have a PIII 1Ghz running
>> 5.4-RELEASE so thought it would be interesting to reproduce your
>> numbers. My null and getpid pretty much do, but the time functions
>> seem much quicker on my machine - some sort of regression in
>> 5.4-STABLE maybe?
>>
>> null function: 0.01578
>> getpid(): 0.49136
>> time(): 0.83031
>> gettimeofday(): 0.78838
>>
>> However, we are still slower than Linux :-(.
>
>
> Interesting. The 5.4 box was a Dell PowerEdge 2550 with a 933 Mhz P3, I
> think IIRC :-), running a kernel & world that's about two months old.
>
>> [Running a pretty much stock kernel, except for:
>>
>> #cpu I486_CPU
>> #cpu I586_CPU
>>
>> and timer.c is compiled w/o any optimization.]
>
>
> That's about what my kernel looks like, and I compiled using nothing but
> "cc -o timer timer.c" as well.
>
To add to the confusion :-), here are results from a dual PIII 1G (Tyan
S2510) running 6.0-RC1 (minus all debugging and malloc checking):
null function: 0.01143
getpid(): 0.51563
time(): 5.27039
gettimeofday(): 5.24489
Interesting - kinda like the 5.4-STABLE results (but 2x slower for
time....). Again a pretty stock kernel ('options SMP' added obviously).
regards
Mark
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