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How to measure peak memory usage

Posted 04-26-2015 at 07:46 AM by BenCollver

In the past, my method to measure peak memory usage was to boot a system, wait for it to become idle, run "free", run the program in question, then run "free" again. The difference is the memory usage. This method accounts for multi-process programs such as the LAMP stack, but it doesn't work as well for ephemeral command line utilities.

Today I ran across an easier way: Run the command line utility with /usr/bin/time -v. Example:

Code:
bash-4.2$ /usr/bin/time -v snzip -c <src.tar >src.snz
        Command being timed: "snzip -c"
        User time (seconds): 0.18
        System time (seconds): 0.03
        Percent of CPU this job got: 99%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 0:00.22
        Average shared text size (kbytes): 0
        Average unshared data size (kbytes): 0
        Average stack size (kbytes): 0
        Average total size (kbytes): 0
        Maximum resident set size (kbytes): 5536
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 425
        Voluntary context switches: 1
        Involuntary context switches: 24
        Swaps: 0
        File system inputs: 0
        File system outputs: 30272
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0
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