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Old   April 16, 2003, 20:27
Default CPU time
  #1
R.
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Hi guys,

Is there any simple way to find out the CPU time used for a code in FORTRAN. I just forgot the command. Your help is appreciated.
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Old   April 17, 2003, 05:52
Default Re: CPU time
  #2
Manosh
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At the Unix prompt, enter:

time yourprog

Manosh
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Old   April 17, 2003, 08:45
Default Re: CPU time
  #3
Jean-François Simon
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In Fortran directly,

REAL time_begin, time_end

... CALL CPU_TIME(time_begin)

... CALL CPU_TIME(time_end)
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Old   April 17, 2003, 15:08
Default Re: CPU time
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R.
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Thanks but none did work! Do I have to use the library?

I am writing my code on Unix computer.
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Old   April 17, 2003, 18:27
Default Re: CPU time
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xueying
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Are you using Fortran 90/95? Both of the methods work for my Fortran 90/95 code without linking to any library, however, if you direct your running results to some file, then the first method doesn't work.
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Old   April 17, 2003, 19:19
Default Re: CPU time
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R.
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Thanks a lot.

What about function ETIME

In the manual it says it should give the CPU time, what I get is very very small values!
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Old   April 18, 2003, 03:13
Default Re: CPU time
  #7
carlslack
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This is a code snippet from my Windows Fortran90 program, if it's of any help...

use portlib

real elapsed_time

elapsed_time=timef() !start processor timer

... program stuff...

elapsed_time=timef() !stop processor timer

write(*,*) 'execution time: (sec)', elapsed_time

end program
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Old   April 18, 2003, 16:28
Default Re: CPU time
  #8
R.
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Thank you very much!
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