gprof with emc2 2.4.7

Hi,

I try this document to enable gprof profiling, and i already got data.

But I only got callgraph and call path, the execution time does not show out. Does anybody know what does it happen ?

Thanks.

We have no idea what you are doing, so hard to say.

It is unlikely to work with anything other than a userspace program which exits normally according to the docs

In order to write the `gmon.out' file properly, your program must exit normally: by returning from main or by calling exit.

regards

I just want to profile emc execution time and cycle, and especially emctask, gui, motion .... and so on.

Right now, I got some execution callgraph, but the execution time has some problems.

AFAIK you need to have a kernel built with readprofile support to be able to profile kernel modules

Since a lot of Linuxcnc comprises of realtime kernel modules, I don't know how much you are going to be able to do with gprof alone.

The more I read about gprof, the less it appears to be useful for much

regards

Thanks for your help !

I think gprof is a view of compiler level, and compiler level is hard to profile linux kernel.

So, I think I should try different profiling view, such as Lttng (system wide).

BTW, oprofile is not support realtime module. When I start oprofile, it crush immediately.