Dear all,
I’ve got a bit of a mystery here.
I’ve got two sets of 1024 2-D histograms (TH2S), “A” and “B”.
“A” histograms are 165x1024, while “B” histograms are 25x1024.
After filling all my 2-D histograms, I create a TProfile for each histogram.
for i in 0…1023:
profileA[i] = histogramA[i]->ProfileX()
… work … work …
profileB[i] = histogramB[i]->ProfileX()
… work … work …
And I’m saving all these histograms and profiles into a ROOT file.
For “A”, everything works fine: each TH2S takes ~343kB and each TProfiles takes ~22 kB.
For “B”, each TH2S is ~55kB but each TProfile is 2MB! The contents seem to be correct and the program produces the expected results, but it’s using a lot more memory and disk space.
For debugging, I’ve made the software run like this:
for i in 0…1023:
profileA[i] = histogramA[i]->ProfileX()
… work … work …
profileB[i] = histogram[color=#FF0000]A[/color][i]->ProfileX()
… work … work …
Of course, this doesn’t produce correct results but it no longer uses so much memory either.
At this point, I’m considering everything, including a possible memory corruption within my program.
But I’ve made a lot of changes and a) the program still works fine b) the unexpectedly big TProfiles remain.
I’m using ROOT 5.34.
If anyone has a clue or an educated guess about what’s going on, I’d be very thankful.
