multithreading, performance, again...

[Antoine Pitrou]

>           39123 function calls (38988 primitive calls) in 6.004 CPU
>           seconds
> 
[...]
> 
> It's not burning CPU time in the main thread (profiling with cProfile
> indicated smth similar to the above), it's not burning it in the
> individual worker threads

What do you mean, it's not burning CPU time? The profile output above 
seems to suggest 6 CPU seconds were "burnt".

By the way, I don't think running several concurrent profile sessions 
dumping *to the same stats file* is supported, consider using a separate 
stats file for each thread or the results may very well be bogus.