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<br><br>> Date: Thu, 30 Apr 2009 11:33:24 +1000<br>> From: Mark.Abraham@anu.edu.au<br>> To: gmx-users@gromacs.org<br>> Subject: Re: [gmx-users] what is meaning of vol 0.95 imb F 1%?<br>> <br>> wuxiao wrote:<br>> > Dear gmx users,<br>> > If -v was passed on to mdrun, such rows one by one would be printed <br>> > continuously as follows:<br>> > vol 0.95 imb F 1% step 1000, will finish Thu Apr 30 15:39:33<br>> > Obviously, the words "step 1000, will finish Thu Apr 30 15:39:33" mean <br>> > that the current running step is 1000, the whole run will finish at <br>> > 15:39:33, on Thuseday, April 30th. But what it is meant by "vol 0.95 imb <br>> > F 1%"? Thank you very much for any reply.<br>> <br>> This is the verbose output produced under dynamic load balancing and<br>> domain decomposition. A quick look at the code didn't make it clear what<br>> "vol" means (it's some kind of DD workload measure, though), and "imb F"<br>> is the load imbalance between different processors in calculating the<br>> forces. I guess that if the two values are reasonably close to 1 and 0%<br>> respectively, then things are fine.<br>> <br>> Mark<br><br>I just realized I never documented this output.<br>vol gives the smallest volume of a DD cell relative to the average volume.<br>This is a measure of the load density differences in your system.<br>It does not have to close to 1. If it is very small, it just means that<br>your system would be very load imbalanced when you would run it without<br>load balancing.<br>The can also be an exclamation mark after the volume. This means that<br>the load balancing was limited by the minimum cell size in one or more dimensions<br>and some cells can not be made smaller, in the log file you can then find more details.<br><br>Berk<br><br><br><br><br /><hr />Express yourself instantly with MSN Messenger! <a href='http://clk.atdmt.com/AVE/go/onm00200471ave/direct/01/' target='_new'>MSN Messenger</a></body>
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