Wall Clock Time in Parallel Computing Cluster

If you’re trying to measure the wall clock time on a cluster, either use the library’s getwalltime function (as in OpenMP) or gettimeofday().
Never use clock() as it counts the number of clock cycles of the processors, and if you’re utilizing more than one processor, the number would accumulate and thus producing incorrect (overshoot) results.


Posted on January 10, 2011, in Computer Configurations. Bookmark the permalink. Leave a comment.

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