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CMS Application :
Occasional lack of work units?
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Send message Joined: 15 Nov 14 Posts: 602 Credit: 24,371,321 RAC: 0  
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I am wondering what causes the occasional lack of work units. I know they fill the WU's with "jobs" when available, and sometimes they are not available. It is usually only for a short period, ten minutes or so, and then they are back. It is not a problem for me, since it is an insignificant amount of time without work. But I am wondering about the larger cause. Is it that the scientists don't create enough work, or that the servers sometimes can't dish it out on time? The overall availability rate has actually been pretty good. |
 Send message Joined: 28 Sep 04 Posts: 728 Credit: 48,998,707 RAC: 25,960 
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Maybe the 'Ready to send' queue is full of sixtrack tasks. If your setup does not accept those, you may not get what you want. There are also two separate download servers (as you can see from different server status page looks) and the other server may not have what you request. 
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Send message Joined: 15 Nov 14 Posts: 602 Credit: 24,371,321 RAC: 0
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Thanks. I do not do the sixtracks, at least not on that machine. The memory requirements are so different I usually use different machines. |
 Send message Joined: 29 Aug 05 Posts: 1060 Credit: 7,737,455 RAC: 1,465 |
I am wondering what causes the occasional lack of work units. I know they fill the WU's with "jobs" when available, and sometimes they are not available. It is usually only for a short period, ten minutes or so, and then they are back. It is not a problem for me, since it is an insignificant amount of time without work. I'm the only one currently generating CMS@Home jobs. I submit "workflows" of 10,000 jobs each. Currently these last about two days, but the uptake by volunteers is quite variable, e.g. when no SixTrack jobs are available our usage can expand by as much as 50%. I have to check several times per day to estimate when I need to inject a new batch. Sometimes I get it wrong, sometimes I forget to check (for some reasons this seems mainly to happen on Saturday nights...). I apologise if this causes problems for you volunteers, but remember that I'm a volunteer too!  |
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