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Questions and Answers : Macintosh : Why do jobs pause every 30-40 seconds?
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Send message Joined: 20 Feb 06 Posts: 22 Credit: 3,416,696 RAC: 451 |
Four different hadcm3n_um_6.07_i686-apple-darwin jobs are running simultaneously. Every 30-40 seconds they each pause for 5-10 seconds, but not necessarily at the same moment. Activity Monitor shows no disk or network activity associated with these pauses. I've tried all the BOINC preferences on resource allocation and runtimes with no effect. What's going on? |
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Send message Joined: 5 Sep 04 Posts: 7629 Credit: 24,240,330 RAC: 0 |
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Send message Joined: 20 Feb 06 Posts: 22 Credit: 3,416,696 RAC: 451 |
Thanks! |
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Send message Joined: 22 Sep 11 Posts: 24 Credit: 243,945 RAC: 0 |
Hi Richard, I noticed the same behavior in Activity Monitor on my iMac when I began running this project, too. It appears to me to be what happens everytime the CPDN/BOINC software performs a "checkpoint" of each of the Work Units. If you go into the Advanced menu in BOINC Manger and select "Event Log..." you'll be able to view what is going on in real time. :) |
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Send message Joined: 5 Sep 04 Posts: 7629 Credit: 24,240,330 RAC: 0 |
As I said before, it's when the program pauses the calculations of what's happening in each "cell", to exchange data between each adjacent cell, ready for the next iteration of calculations. Otherwise the model would just be a large number of totally isolated little worlds a few miles across. One of these exchanges also occurs just as the program does a checkpoint. Backups: Here |
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