I need to profile lazarus applications under linux. I tried gprof, but it is broken since years and shows no record. I tried valgrind (callgrind), but it slows down the execution by factor 80, making it unusable.

I found the following page, but it does not help here: http://wiki.lazarus.freepascal.org/Profiling

How can I profile under linux?

Mattias

Mattias Gaertner wrote

I need to profile lazarus applications under linux. I tried gprof, but it is broken since years and shows no record.

Neither does the bug repository show any record of open bugs against - pg on Linux.

I found the following page, but it does not help here: http://wiki.lazarus.freepascal.org/Profiling How can I profile under linux?

I've used qprof successfully in the past (not for FPC programs, but for other things). It's a sampling-based profiler, so it shouldn't slow down things too much.

Jonas

I can confirm with Mattias. I tried over a year ago to do profiling using gprof. It always generated a empty (0 byte) file. Nothing else. I posted messages to the mailing list and was told to try valgrind instead. It issues with gprof was known at the time.

Regards,
- Graeme -

_______________________________________________
fpGUI - a cross-platform Free Pascal GUI toolkit
http://opensoft.homeip.net/fpgui/

Graeme Geldenhuys wrote

I can confirm with Mattias. I tried over a year ago to do profiling using gprof. It always generated a empty (0 byte) file. Nothing else. I posted messages to the mailing list and was told to try valgrind instead. It issues with gprof was known at the time.

If there is no bug report about it, it's very likely that it will be forgotten over time (as in this case, apparently -- I indeed seem to remember that at one point I knew about this).

Jonas

There is indeed a problem. I submitted a bugreport with a test program.

The program does not execute correctly when compiled with -pg.

Michael.

Zitat von Jonas Maebe :

Sorry. I thought the problem is known and the fpc team prefers valgrind. I saw that Michael created a bug report, with major urgent priority - wow.

Yes, that's why I prefer gprof and used it a lot in the past.

Mattias

Note that I was talking about qprof (http://www.hpl.hp.com/research/linux/qprof/ ), not gprof. As opposed to qprof (and Shark on Mac OS X), gprof is not a sampling-based profiler (gprof traces the entire execution).

Jonas

In our previous episode, Michael Van Canneyt said:

Has it worked at all for 64-bit ? Otherwise maybe the title of the bugreport should be corrected.