[Ipopt-tickets] [Ipopt] #299: Profiling code slows runtime (CpuTime getrusage)

[Ipopt]

#299: Profiling code slows runtime (CpuTime getrusage)
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Reporter:  bdavis                               |      Owner:  ipopt-team
    Type:  enhancement                          |     Status:  new
Priority:  normal                               |  Component:  Ipopt
 Version:  3.12                                 |   Severity:  normal
Keywords:  getrusage CpuTime runtime profiling  |
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 I am running Ipopt on MacOS Sierra built with clang. I am using the Matlab
 Interface on 2017a.
 My problem order is low (2 variables, no constraints), but I need to run
 many times with different input.

 I ran a profile with Instruments and found that a large amount of time was
 spent in the getrusage system call. This happens in IpUtils.cpp CpuTime()
 and SysTime().

 My hack solution (attached) was to add a compiler define around this to
 bypass the calling of getrusage and simply return zero for the profile
 times. This improved my runtime by about 33%.

 I wish there was a more elegant solution to this (an option?) that could
 be configured at runtime.

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Ticket URL: <https://projects.coin-or.org/Ipopt/ticket/299>
Ipopt <http://projects.coin-or.org/Ipopt>
Interior-point optimizer for nonlinear programs.