x64 speed

M.-A. Lemburg mal at egenix.com
Wed Feb 4 22:26:37 CET 2009


On 2009-02-04 11:14, Robin Becker wrote:
> Martin v. Löwis wrote:
>>>> I follow David's guess that Linux does better IO than Windows (not
>>>> knowing anything about the benchmark, of course)
>>>>
>>> I originally thought it must be the vmware host stuff offloading IO to
>>> the second core, but watching with sysinternals didn't show a lot of
>>> extra stuff going on with the vm compared to just running on the host.
>>
>> I'm not talking about vmware. I'm suggesting that Linux ext3, and the
>> Linux buffer handling, is just more efficient than NTFS, and the Windows
>> buffer handling.
>>
>> If you split the total runtime into system time and user time, how do
>> the 30s split up?
> .......
> so here is one for the vm clock is bad theorists :)
> 
> 
>> [rptlab at localhost tests]$ time python25 runAll.py
>> .............................................................
> 
> .........................
>> ----------------------------------------------------------------------
>> Ran 193 tests in 27.841s
>>
>> OK
>>
>> real    0m28.150s
>> user    0m26.606s
>> sys     0m0.917s
>> [rptlab at localhost tests]$
> 
> magical how the total python time is less than the real time.

time(1) also measures the Python startup and shutdown time, so
I don't quite see the magic :-(

FWIW: VMware VMs need the VMware tools installed to make their
clocks work more or less. With Linux, you need some extra tweaks
as well, otherwise the clocks are just completely unreliable.

See these notes:

http://kb.vmware.com/selfservice/viewContent.do?language=en_US&externalId=1420
http://communities.vmware.com/message/782173

-- 
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