Hi Alex,
I'm not sure about PBS, so I'd like to let someone more expert answer that part of the question. As for what concerns you second question you can get more information about statistics and sampling in the following lecture of the fluka course HERE<
https://indico.cern.ch/event/442634/contributions/1096541/attachments/1185162/1717804/09_Statistics_and_sampling_2015.pdf>
In short both options are fine, and there is an obvious interest in running your 24 jobs in parallel so you should do that.
The equation on slide 33 will show you that there is a slight difference between the error estimates (which is linked directly to the variance) between the two cases. In one case, you have more cycles/batches so the first factor goes down, and in the other, you have more primaries per cycle so most likely the (mean of squares - square of mean) will be lower. The error will be slightly smaller in the former case, but I encourage you to check to get convinced.
Best regards
Philippe
From: owner-fluka-discuss_at_mi.infn.it [mailto:owner-fluka-discuss_at_mi.infn.it] On Behalf Of Ševcik Aleksandras
Sent: 21 March 2017 10:42
To: Alfredo Ferrari <fluka-discuss_at_fluka.org>
Subject: [fluka-discuss]: Fluka on OpenPBS - only one core is used
Dear experts,
I'got an access on the cluster grid that uses OpenPBS. The only help I can get is the google, and combined with no any experience it leads to this forum as the last chance.
In a nut, I have a script which successfully launches the job, see the attached file. But only one core is used out of 8 (each node has 8 cores).
1) how should I modify the script to launch 8 jobs at once ? I imagine that process is similar like Flair uses. I'm aware that .inp file should contain RANDOMIZ card with default value.
2) If I want to utilize 3 nodes with 8 cores each, can I launch 24 jobs then? As I understand , 12 runs x 1E8 events are not equivalent to 24 runs x 5E7 events , are they?
Regards
Alex
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Received on Tue Mar 21 2017 - 15:48:40 CET