Re: Weird performance problem

[Paul Smith]

On Wed, 2010-07-14 at 15:01 -0300, Leandro Lucarella wrote:
> The time was measured by several methods, including from inside the
> program (option -v) and using strace to trace both the program and make,
> and the difference are not because of make, the same program takes
> longer to execute itself when ran from make. Also note that the program
> without a change the change in the post runs equally fast inside and
> outside make. I can understand a program having different performances
> with and without a change, but I don't understand why is that difference
> only showing when executed inside make (and the difference is so
> reproducible and stable, even among different hardware).

Also you can try ltrace which does library calls, not just system calls.

I'm hard-pressed to think of any reason for this.