[Bug gcov-profile/95348] GCC records zero functions and modules in the profiling data file, ICC does NOT

[qinzhao at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95348

--- Comment #18 from qinzhao at gcc dot gnu.org ---
(In reply to Martin Liška from comment #16)
> > For our application, all processes generating profiling feedback data to a
> > single directory seems is not a choice. 
> 
> Why is it problem? You need to provide reasoning for that.

this is a long time ago. If I remembered correctly, we tried the scheme that 
all the processes generate profiling feedback data to the single directory, 
but looks like a lot of info got lost, resulting bad performance effect. 
then we switched to this current approach. 

> 
> > We chose -fprofile-dir=%p and then use gcov-merge to merge them.
> 
> Sure, that's possible but you pay with a lot of disk space needed.
> Btw. how long does it take to merge all the collected data with gcov-tool?
I didn't get very accurate info on this, but it's over 24 hours for merging.