Slow/sluggish response ("system" task at 50%)

[Edward Lam]

On Wed, June 24, 2009 21:53, Edward Lam wrote:
> PS. So I went ahead and repeated the tr test on an older (Intel Core 2
> Quad 2.66 GHz) machine with cygwin 1.5 on Windows *32-bit*:

Sorry, I got the system specs wrong. It's actually just an Intel Core 2
6600 2.40 GHz machine.

>
> $ time -p for ((i=1; i<100; i++)); do var=$(echo $i | tr [a-z] [A-Z]);
> done
> real 2.64
> user 6.56
> sys 1.85
>
> We're talking about a difference between an Intel processor ONE GENERATION
> OLDER, on an older version of cygwin, yet being a few times FASTER.
>
> On Wed, June 24, 2009 21:49, Edward Lam wrote:
>> On Wed, June 24, 2009 17:29, Larry Hall (Cygwin) wrote:
>>> Sure, we all know that Cygwin provides Linux emulation and suffers some
>>> overhead for it.  But timings from an individual machine can be
>>> misleading.
>>> Running this through multiple times for both Mingw and Cygwin 1.7 on my
>>> similarly equipped machine, I see Cygwin is somewhere between 1.7 and
>>> 2.25
>>> times slower.  Whether yours or my result is more typical, I can't say.
>>> But as you noted, neither data set provides much justification for the
>>> results reported.
>>
>> Larry,
>>
>> Are you on 32-bit Windows or 64-bit Windows? I've noted on this mailing
>> list earlier that there are large speed differences between the two. I
>> wonder which platform Gene is on. The tr test results are consistent on
>> Windows 64-bit for me.
>>
>> I don't quite understand what MINGW32 is doing that makes it ~2 times
>> faster than cygwin.
>>
>> -Edward
>>
>>
>>
>>
>
>
>
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