[Bug 1336130] New: derived metrics between singleton and indom'd metrics result in bad result indom

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https://bugzilla.redhat.com/show_bug.cgi?id=1336130

            Bug ID: 1336130
           Summary: derived metrics between singleton and indom'd metrics
                    result in bad result indom
           Product: Fedora
           Version: rawhide
         Component: pcp
          Assignee: nathans@xxxxxxxxxx
          Reporter: fche@xxxxxxxxxx
        QA Contact: extras-qa@xxxxxxxxxxxxxxxxx
                CC: brolley@xxxxxxxxxx, fche@xxxxxxxxxx, lberk@xxxxxxxxxx,
                    mgoodwin@xxxxxxxxxx, myllynen@xxxxxxxxxx,
                    nathans@xxxxxxxxxx, pcp@xxxxxxxxxxx, scox@xxxxxxxxxx



Created attachment 1157490
  --> https://bugzilla.redhat.com/attachment.cgi?id=1157490&action=edit
possible patch

Let x.conf be a file

   x = kernel.all.uptime - proc.psinfo.start_time

Let the command to run be

   env PCP_DERIVED_CONFIG=/path/to/x.conf pminfo -f x

Observe output

  x
    value 1008990.98
    value 1008990.98
    value 1008990.97
    value 1008990.97
    value 1008990.97
    value 1008990.97
    [...]

Observe absence of instances.  Let the next command to run be

   env PCP_DERIVED_CONFIG=/path/to/x.conf pminfo -d x

Observe output:
  x
    Data Type: double  InDom: PM_INDOM_NULL 0xffffffff
    Semantics: instant  Units: sec

Observe mismatch: InDom should have been the indom of the right operand
(proc.psinfo.start_time).

Examine libpcp/src/derive.c, find bugs.

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