3 processes for a task
Message boards : Unix/Linux : 3 processes for a task
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suguruhirahara
Forum moderator Volunteer tester 
Joined: Sep 13 06 Posts: 282 ID: 15 Credit: 56,614 RAC: 0 |
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Hello,
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David Ball
Forum moderator Volunteer tester 
Joined: Sep 18 06 Posts: 274 ID: 115 Credit: 1,634,401 RAC: 0 |
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suguruhirahara Wrote: I realised that there are 3 processes of charmm running for 1 task, one of which is always active but the others are often 'sleeping'. (while the capture indeed shows all are active, it was taken just after the task got started.) Hi Suguru, That seems to be normal. Other BOINC projects do that as well. I believe that they are actually threads within the standard project clients. On Linux, they show up as separate processes due to the way threading is implemented. On WinXP task manager, they show up as a single process running 4 or 5 threads. The exception I've seen is ClimatePrediction, which seems to be running 2 WinXP processes, one with 3 threads and one with 1 thread, but that WU is running an older version of the CPDN client because I've been crunching on it for about 6 months. I'd have to research it to find out exactly what the threads do, but I do know there are some heartbeat messages that are used to find out if a client is still running. I suspect they have something to do with that and probably some similar tasks. I have noticed that the extra threads never accumulate much CPU time. IIRC, Linux threads have separate process ID's, but they have something called a "Thread Group ID", which would be the same for all the threads within the program. The thread group ID is the Process ID of the initial process created when the program started. On a single threaded program, the thread group ID and the Process ID would be the same. Regards, -- David |
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Message boards : Unix/Linux : 3 processes for a task
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