Dear Manhui, <br><br>Thank you for your answer. <br>However my question was a little bit different, briefly:<br>If 1-core task require e.g. 8Gb of memory and my cores have access to less than 8Gb, can I reduce memory demand per core by redistribution it over N cores with lesser memory demand? If I can, what is the recipe?<br>
<br>Thank you very much.<br>Best,<br>Jani.<br><br><div class="gmail_quote">On Fri, Jun 21, 2013 at 2:12 AM, Manhui Wang <span dir="ltr"><<a href="mailto:wangm9@cardiff.ac.uk" target="_blank">wangm9@cardiff.ac.uk</a>></span> wrote:<br>
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Dear Jani,<br>
<br>
The setting <br>
memory, 1000, m<br>
is for one core. If you use N cores, the total memory will be
N*1000*1000*1000 Words (ie, N*1000*1000*1000*8 bytes).<br>
<br>
For details, please refer to previous list<br>
<br>
<a href="http://www.molpro.net/pipermail/molpro-user/2010-April/003723.html" target="_blank">http://www.molpro.net/pipermail/molpro-user/2010-April/003723.html</a><br>
<br>
Best wishes,<br>
Manhui<div><div class="h5"><br>
<br>
<br>
<div>On 20/06/13 11:49, Jani Salo wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">Dear Molpro Users,<br>
<br>
I have specific question about how memory (or shared memory) is
used in the parallel mode. <br>
I want to run an CCSD(T)/aug-cc-pVDZ calculation of uracil dimer
on my small-cluster with 16 cores (with 64 GB of memory)<br>
It seems that such system needs more than 8GB of memory for 1-core
calculation, but it very slow, so when I'm trying to do a parallel
calculation on 2 or 2^N cores<br>
the memory demand is not reduced by that factor. I've changed
"memory, 1000, m" option back and forth, but it was not helpful
either.<br>
(I've used compiled mpp-binary Molpro 2012.1 from the website)<br>
<u>So Is Molpro distribute used memory over processes or copied
the same information? </u><br>
How I can control this behavior? <br>
I've tried to use -G option (even that in manual written that "is
no longer activated") but it was not helpful. I have not found the
answer on this question in manual and other sources.<br>
Can one explain this issue?<br>
<br>
Thank you!<br>
<br>
Best,<br>
Jani.<br>
<br>
<br>
<br>
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<pre cols="72">--
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Manhui Wang
School of Chemistry, Cardiff University,
Main Building, Park Place,
Cardiff CF10 3AT, UK
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