Hi
I suspect that this is more to do with the amount of memory required,
size of arrays etc; refinement will (in general) be more demanding in
terms of these than an integration program like Mosflm. The last time
I compared the Mosflm performance (which was a few years ago),
running the same batch job on OSX 10.4 (Tiger), and on Windows XP and
Linux Feisty Fawn (so you can tell how long ago this was) - both the
latter running under virtual machines on the same 32-bit Intel Mac
that the OSX job ran on) there was essentially no difference in
performance (though I have a vague memory of Ubuntu being a little
faster, maybe ~3%).
Some caveats -
* I used a gfortran build for OSX and Linux, g77 build for Windows
* I didn't spend too much time on this
* I wasn't running a GUI - all three as foregrounded jobs, "nothing"
else running on the machine (I tried to make sure only the OS and
essential services were running). So this wasn't a "batch" job in the
traditional sense...
* gfortran builds these days are considerably faster (and compare
well to ifort builds)
On 7 Apr 2012, at 17:50, Roger Rowlett wrote:
I don't know the state of current software, because I haven't tried
recently, but when I set up my student crystallography workstations
a few years back I noticed many packages (e.g. EPMR, Phaser) that
had potentially long run times (where it is really noticeable)
would run on the identical hardware about 2-3 times faster in Linux
than in Windows XP. Memory swapping wasn't the issue. I was
astounded there could be that much overhead in Windows. A Linux VM
on a windows machine being faster than native Win7 is pretty weird,
though.
Cheers,
On 4/7/2012 11:42 AM, Bernhard Rupp (Hofkristallrat a.D.) wrote:
Something the developers might be interested in:
The Refmac_5.6.0117 32-bit windows binaries run native on a
win64 3-4x
slower than
those from the linux distribution run
**in a RHEL6.2-64 VMware virtual machine hosted the same windows7/64
system.....**
VM/RHEL:
Refmac_5.6.0117: End of Refmac_5.6.0117
Times: User: 1015.3s System: 135.0s Elapsed: 19:17
Win native
Refmac_5.6.0117: End of Refmac_5.6.0117
Times: User: 0.0s System: 0.0s Elapsed: 67:49
Most peculiar....although I think but I do not know whether the linux
binaries are 64 bit
I don't think that address space is the issue here if they are.
Maybe the paranoia-checkers in windows slow everything down
although I did not see any resources overwhelmed...
Best regards, BR
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Bernhard Rupp
001 (925) 209-7429
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b...@ruppweb.org
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http://www.ruppweb.org/
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Dr Harry Powell, MRC Laboratory of Molecular Biology, MRC Centre,
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