First some general remarks: In general, what you are doing is mostly an exercise in futility and is the reverse of how most people would probably go about performance analysis. The first point to make is that the peak value you are quoting is for strictly for floating point multiply-add instructions (FMAD), which count as … Read more
There are a number of performance analysis tools specialized for Parallel/MPI Programs, such as: Score-P, which works with a number of different Analysis tools, e.g. Cube, Vampir HPCToolkit uses sampling only, so you do not have to recompile your application Tau At first they may not be as simple to use simple to use, but … Read more
gprof (read the paper) exists for historical reasons. If you think it will help you find performance problems, it was never advertised as such. Here’s what the paper says: The profile can be used to compare and assess the costs of various implementations. It does not say it can be used to identify the various … Read more