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| Re: measure runtime of a java program using Eclipse [message #334494 is a reply to message #334484] |
Thu, 12 February 2009 16:52  |
 Walter Harley
Messages: 847
Registered: July 2009 |
Senior Member |
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"Tarek Garoui" <tgaroui@yahoo.de> wrote in message
news:56a515540829377763e1858b2c449d98$1@www.eclipse.org...
> Hello,
> in the second alternative, I will have the time difference which includes
> the runtime of other parallel programs. What I need is the runtime of a
> single Eclipse process.
"runtime" is not a well-defined term. If you want people to answer specific
questions, you need to ask specific questions. We are not telepathic.
But, cumulative CPU time for a process is also not well defined,
unfortunately. That's not really how operating systems work. For instance,
if two processes are writing files in the same area, the file subsystem may
process them together - in that case, how much CPU time was spent on which
process? You can measure cumulative *user* time for a single process, that
is time spent in that process's code, but measuring cumulative system time
is harder. And of course if you have more than one CPU, then cumulative
user CPU time will not be the same as real run time.
That said, perhaps you are running on an operating system that can give you
the estimated cumulative CPU time for a process upon completion. In that
case, and if that is really all the information you need, then all you need
is to be able to wrap your program with a shell of some sort and capture the
console output upon completion, no?
Personally I would suggest that if your needs are this detailed, you should
be using a profiler (YourKit, Eclipse TPTP, JProfiler, ...).
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