#4761: [with patch, needs work] global cputime (inclusive some subprocesses like
Singular)
-----------------------------------------+----------------------------------
Reporter: malb | Owner: malb
Type: enhancement | Status: new
Priority: major | Milestone: sage-3.4.1
Component: misc | Resolution:
Keywords: global cputime subprocesses |
-----------------------------------------+----------------------------------
Changes (by SimonKing):
* keywords: => global cputime subprocesses
* summary: [with patch, needs review] global cputime (inclusive some
subprocesses like Singular) => [with patch,
needs work] global cputime (inclusive some
subprocesses like Singular)
Comment:
First of all, the patch applies cleanly.
I tested the example from the documentation, and I tested an example
involving singular and gap.
What I find really amazing: Assume that you did
{{{
sage: t=cputime(subprocesses=True)
sage: s=cputime(subprocesses=False)
}}}
and later you do
{{{
sage: cputime(t)
sage: cputime(s)
}}}
I expected that `cputime(t)` would assume `subprocesses=False`, since its
previous usage (in the definition of s) had this option. But `cputime(t)`
indeed recognizes that t was defined with `subprocesses=True`. This is a
very nice feature.
However, something seems to be wrong.
I did the following:
{{{
sage: t=cputime(subprocesses=True)
sage: s=cputime(subprocesses=False)
sage: {... some lengthy computation...}
sage: cputime(t)
1.440028
sage: cputime(s)
0.45202800000000032
sage: cputime(s,subprocesses=True)
1.972029
sage: cputime()
2.2761420000000001
sage: cputime(subprocesses=False)
2.2801420000000001
sage: cputime(subprocesses=True)
3.800142
sage: quit
Exiting SAGE (CPU time 0m0.65s, Wall time 11m49.60s).
Exiting spawned Singular process.
Exiting spawned Gap process.
}}}
Hence, when leaving Sage, it is stated that the CPU time spent is 0.65s,
whereas `cputime(subprocesses=False)` claims that it is more than 2
seconds. Therefore, I can not give a positive review yet.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/4761#comment:8>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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