Suddenly stops working beyond a certain number of samples

I found what I assume is a bug in perfanno when reading perf.data files that have more than ~14500 samples. When trying to load a perf.data that is beyond a certain size, it will never actually finish loading. The two images below are (ironically) perf data from perfanno reading a file with 14400 samples and a file with 14900 samples. #### 14400 samples  #### 14900 samples  As the image suggests, the perfanno with the smaller file loaded in under a second. The other one, however, shows perf being run for a much shorter time, but without giving you annotated source code.