RooFit for loop fitTo explodes in memory usage

[lan13005]

There seems to be some discussion about a similar error before but was quite some time ago and was resolved (2012)
https://root-forum.cern.ch/t/memleak-when-fitting/13745

Everytime I call fitTo there seems to be various roofit objects that are created and are not cleaned after every iteration. I cannot get RooTrace::dump() to output anything but I am able to use RooTrace::printObjectCounts() to output the object counts. It seems fitTo creates a bunch of RooAbsCollection objects that are not cleaned which starts to consume all the memory. I can see the resident memory usage go up when looking at the top command. I put together a small program that I think shows this problem.

Tried with root 6.08 and 6.23.

testMemoryUsage.zip (761 Bytes)

[jalopezg]

Hello @lan13005,

Taking a quick look at the code, it seems there is a memory leak somewhere. Could you please create a GitHub issue here to keep track of this problem and its solution? Do not forget to attach the test program showing the problem.

Cheers,
J.

[lan13005]

Ok no problem. I started a github issue: https://github.com/root-project/root/issues/6975

[jalopezg]

Thanks, @lan13005!