[Beowulf] Time measurement

Vincent Diepeveen diep at xs4all.nl
Wed Aug 3 09:10:07 PDT 2005

Always measure wall clock time of execution. That's IMHO the only thing
that really counts and it includes all overhead.

Take into account that at most clusters the wall clock time of node A is
not the same like wall clock of node B.

If you start a job at the head node and spawn it from there further to
the rest of the cluster, what counts obviously is the time from when you
started it, until it finished execution.

Because in reality what matters is how quickly you did get the job done.


At 08:13 AM 8/1/2005 -0700, ThanhVu  H. Nguyen - Gmail wrote:
>Hi, just wondering what the standard way of measure the execution time
>2 methods I thought about are: 
>1) /usr/bin/time  prog   : this includes all the communcation, i/o ,
>loading overhead etc
>2) include start_time , end_time code in the program : this won't
>include the communication , i/o , loading etc overhead.
>what method is usually used ?  thanks  
>ThanhVu H. Nguyen
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