Description of problem: From PCPIntro(1): -S starttime By default the time window commences immediately in real-time mode, or coincides with time at the start of the PCP archive log in archive mode. The -S option may be used to specify a later time for the start of the time window. interval To specify an offset from the current time (in real-time mode) or the beginning of a PCP archive (in archive mode) simply specify the interval of time as the argument. For example -S 30min will set the start of the time window to be exactly 30 minutes from now in real-time mode, or exactly 30 minutes from the start of a PCP archive. But: $ pmval -S 1m kernel.all.sysfork pmval: time window options are supported for archives only Usage: pmval [options] metricname ... So the man page and the libpcp code are not in sync.
This is a bit of a shortcoming (incorrect assumption) in the pmGetOptions(3) routine - should not be very hard to fix if someone wants to take a crack at it.
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