Library /sys$common/syshlp/SDA.HLB  —  SPL Extension, Collecting SPL Statistics
    The following example shows a command procedure that can be used
    for gathering spinlock statistics:

    $ analyze/system
      spl load
      spl start trace/buffer=1000
      wait 00:00:15
      spl stop trace
      read/executive/nolog
      set output spl_trace.lis
      spl analyze
      spl show trace/summary
      spl start collect/spin=sched
      wait 00:00:05
      spl show collect
      spl start collect/spin=iolock8
      wait 00:00:05
      spl show collect
      spl start collect/spin=lckmgr
      wait 00:00:05
      spl show collect
      spl start collect/spin=mmg
      wait 00:00:05
      spl show collect
      spl start collect/spin=timer
      wait 00:00:05
      spl show collect
      spl start collect/spin=mailbox
      wait 00:00:05
      spl show collect
      spl start collect/spin=perfmon
      wait 00:00:05
      spl show collect
      spl stop collect
      spl unload
      exit
    $ exit

    A more comprehensive procedure is provided as
    SYS$EXAMPLES:SPL.COM.
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