Re: Partial heap profiling with Massif

Milian Wolff <[email protected]> Tue, 29 Sep 2020 15:19:07 +0200
Newsgroups	gmane.comp.debugging.valgrind
Message-ID	<160140810.dVMCjjLxp9@milian-workstation>
On Dienstag, 29. September 2020 12:19:24 CEST LEPAREUR Loic wrote:
> Le 21/09/2020 à 17:04, Milian Wolff a écrit :
> > On Donnerstag, 17. September 2020 15:32:04 CEST John Reiser wrote:
> >> On 2020-09-17 LEPAREUR Loic wrote:
> >>> Several years ago, I developed a Massif patch to let the client code
> >>> select which part of the code should be profiled with Massif.
> >> 
> >> Today this is much less interesting unless you compare and contrast with
> >> https://github.com/KDE/heaptrack .  Do a web search for "heaptrack vs
> >> massif". Consider particularly "A Faster Massif" in
> >> https://milianw.de/tag/heaptrack , and
> >> https://milianw.de/tag/massif-visualizer .
> > 
> > In other news: I just pushed a bunch of patches to heaptrack git which
> > allow you to do time-diffing. I.e. you can now select a time range in the
> > charts and then request filtering to show the delta costs between the two
> > time points.
> > 
> > This should allow you to solve your problem nicely.
> > 
> > Alternatively, you can also runtime-attach heaptrack after you finished
> > your initialization phase to only record the main computational loop. The
> > overhead should be minimal or actually close to zero when your main loop
> > isn't allocating anything.
> > 
> > Cheers
> 
> OK, thanks for pointing that out. I didn't know about it, I will give it
> a try.
> 
> Heaptrack requires recent versions of KChart and Qt for the GUI and it
> isn't easy to upgrade them here.

What do you mean by "recent" - to my knowledge it can build with some-years-
old versions of both ;-)

But even then, you can just download the AppImage and don't need to install 
anything then:

https://download.kde.org/stable/heaptrack/1.2.0/

> And since you LD_PRELOAD Heaptrack, it
> would be very easy to add client requests mechanism, but I will try
> vanilla version first.

Yes, there's already `heaptrack_api.h`, which could be expanded to add support 
for client markers or similar.

Cheers

-- 
Milian Wolff
[email protected]
http://milianw.de

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