I want to profile my Python program to understand why it is so slow. I decided to use Yappi - because my program is multithreaded - and to diplay the results with KCacheGrind. Here is how I do it:
# Profile of the update method
def profile_update(table, start, end):
print("Profiling update() on the %s table..." % (table))
yappi.start(builtins=True)
app.update(...)
stats = yappi.get_func_stats()
output_name = "profiler_%s.out." % (table) + datetime.now().isoformat()
stats.save("profilers_outputs/" + output_name, type='callgrind')
yappi.stop()
yappi.clear_stats()
print('\n\n\n')
The method update is used to fetch data from a database with a time range between start and end.
The output file is correctly created but when I launch KCacheGrind it prints a lot of errors like this:
kcachegrind(35484): Loading "profilers_outputs/profiler_benchmark.out.2019-06-26T17:21:41.147461" : 17529 : "Undefined compressed function index 586"
kcachegrind(35484): Loading "profilers_outputs/profiler_benchmark.out.2019-06-26T17:21:41.147461" : 17529 : "Invalid called function, setting to unknown"
I end up with this call graph where all the non recognized functions are aggregated as one, making it messy and completely irrelevant. Does anyone know why it is happening ?
