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Forum: Multithreading
Re: Question Simulation hang up (bilal)
Re: Question Re: Simulation hang up (Andrea Dotti)
Date: 26 Mar, 2015
From: bilal <bilal>

Hello, first of all, which version of G4 are you using?

I am using 4.10.01 (sorry not to mention it before)

please note that the number of events is a integer variable. As such you need to be sure that its value is smaller than the maximum allowed value that is about 2*10^9. If you need more events you need to split the job in multiple runs.

I encountered this issue before and saw the answer in a previous thread so i keep my total number of particles upto a maximum of 1x10^9. However i would love to see if someone change the data member from int to something else and post how to do it.

In case this is not the problem, you should verify if the CPU is actually doing something (e.g. the remaining threads are using CPU cycles) or if the threads are waiting (deadlock) doing nothing. You can check that with "top". Also check that the memory used by your job is not abnormally increasing (that could be due to a memory leak).

Okay i check with the top command and all the cpus are busy 100 %. But i print the events on screen (from event action) and it shows only a couple of threads updating the number of events processed rest are silent. I tried to run the example with the memory leak command however i cant understand the output (its a big file and i dont know how to find where is the memory leak and how to fix it). Thank you for the help i would appreciate any further comments or suggestions.

Bilal

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1 Warning: Re: Simulation hang up   (Andrea Dotti - 26 Mar, 2015)
(_ Feedback: Re: Simulation hang up   (bilal - 26 Mar, 2015)
(_ Idea: Re: Simulation hang up   (Andrea Dotti - 26 Mar, 2015)
(_ Note: Re: Simulation hang up   (bilal - 26 Mar, 2015)
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