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- From: fox@rudolf.nscl.msu.edu (Ron Fox)
- Newsgroups: vmsnet.alpha
- Subject: Re: (re-posted) cpu time measurement on VMS.
- Message-ID: <1k0rskINNg0h@msuinfo.cl.msu.edu>
- Date: 25 Jan 93 14:01:56 GMT
- References: <10266@cimshop.UUCP>
- Reply-To: fox@rudolf.nscl.msu.edu (Ron Fox)
- Organization: National Superconducting Cyclotron Lab.
- Lines: 83
- NNTP-Posting-Host: rudolf.nscl.msu.edu
-
-
- --
- In article <10266@cimshop.UUCP>, vchow@helios.UUCP (Victor Chow) writes:
- >Path: msuinfo!srvr1.engin.umich.edu!uunet!cimshop!helios!vchow
- >
- >In article <C164Hn.223@dscomsa.desy.de> you write:
- >|> In article <1993Jan20.164619.8700@eecs.nwu.edu>, shil@eecs.nwu.edu
- >|> (Lei Shi) writes:
- >|>
- >|> |>
- >|> |>Hi:
- >|> |> ... My question is how I can measure the total CPU used by the
- >|> |> execution of the program ... in VMS ...
- >|> |> Your Sincerely,
- >|> |>
- >|> |> Lei Shi
- >|>
- >|> The are various alternatives. The simplest way is to run your program as
- >|> a batch job. ... Otherwise, you can use
- >|> the $ SHOW PROC /ACC for an interactive session but that cannot (as far as
- >|> I am aware) be zeroed before execution of a program. Finally, if this is not
- >|> sufficient you should investigate the run time library timer routine
- >|> LIB$SHOW_TIMER, LIB$STAT_TIMER ... (try $ HELP RTL LIB$ *TIMER*.
- >|>
- >
- >Lei Shi,
- >
- >Using LIB$ or SYS$ calls allow you to get accurate accounting information about
- >a process the way you want. The disadvantage is that you have to modify your
- >source code to do so (and provided that you still have the source code).
- >
- >Submitting an image to a batch job and get the accounting information from the
- >log file should get what you need. However your LOGIN.COM and the system
- >SYLOGIN.COM should be relatively short and do not run resource hogging command
- >s or images (relative to your actual image). Otherwise the accouting info of
- >the batch job does not accurately reflect the resources used by your image
- >only. Remember that a VMS batch job includes not only the images/commands you
- >want run, but also other commands or images (such as LOGIN.COM and SYLOGIN.COM,
- >etc) that are executed as part of the batch job.
- >
- >Another simple alternative that requires no modification to your code and LOGIN/SYLOGIN.COM is to do the following steps:
- >
- >1. create a file, say, your_image.COM like this:
- > $ run your_image.EXE or (@ your_dcl.COM)
- > $ logout/full
- >
- >2. then at the DCL prompt, enter
- > SPAWN @your_image.COM
- >
- >The SPAWN starts a child process which starts with "zeroed" accounting info to
- >run your image and the "logout/full" command. The "Accounting information"
- >that logout/full prints should be very close to what "your_image" needs (plus
- >the overhead needed by the SPAWN(?), @your_image.COM, and "logout/full",etc).
- >(I assume your program takes a lot more resources to run than a simple SPAWN
- >command.)
- >
- >As long as you are not trying to precisely measure a tiny image that uses very
- >little resource and that you don't need to get the process' accounting info at
- >different parts of your image, this simple method should be adequate.
- >
- >Good luck! 8-)
- >
- >Victor
- >
- >
- >
- >
- >
- >
- >
- Non invasive timings can be gotten via:
-
- SHOW PROCESS/ACCOUTING
- RUN YOUR_IMAGE
- SHOW PROCESS/ACCOUTING
-
- and doing some simple subtractions.
- RF.
- Ron Fox | FOX@MSUNSCL.BITNET | Where the name
- NSCL | FOX@RUDOLF.NSCL.MSU.EDU | goes on before
- Michigan State University | MSUHEP::RUDOLF::FOX | the quality
- East Lansing, MI 48824-1321 | | goes in.
- USA
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