/usr/bin/time -v

Mindig a bash beépített time parancsát használtam eddig sebesség mérésre, de most felfedeztem a /usr/bin/time parancsot. Előnye hogy egy rakás statisztikát kiír a folyamatról a parancs futása végén. Ilyen pl. a felhasznált idők, felhasznált legnagyobb rezidens memória méret, egyéb I/O statisztika.

Példa chromium-ra pár oldal meglátogatása után: 


/usr/bin/time -v chromium-browser 
        Command being timed: "chromium-browser"
        User time (seconds): 8.08
        System time (seconds): 2.53
        Percent of CPU this job got: 11%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 1:34.75
        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): 266960
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 0
        Minor (reclaiming a frame) page faults: 63674
        Voluntary context switches: 38128
        Involuntary context switches: 9406
        Swaps: 0
        File system inputs: 2104
        File system outputs: 24808
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0

( dash | 2012. 10. 10., sze – 23:39 )

Command being timed: "firefox"
        User time (seconds): 9096.57
        System time (seconds): 1767.33
        Percent of CPU this job got: 21%
        Elapsed (wall clock) time (h:mm:ss or m:ss): 14:02:10
        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): 1477912
        Average resident set size (kbytes): 0
        Major (requiring I/O) page faults: 91
        Minor (reclaiming a frame) page faults: 9902976
        Voluntary context switches: 46974026
        Involuntary context switches: 2092509
        Swaps: 0
        File system inputs: 37096
        File system outputs: 7125720
        Socket messages sent: 0
        Socket messages received: 0
        Signals delivered: 0
        Page size (bytes): 4096
        Exit status: 0