Yappi error "context not found"

[Brian]

I'm posting here because I can't find a Yappi specific mailing list.

I've been using the rather brilliant Yappi from http://code.google.com/p/yappi/
It works well for small programs with a few threads. However, when
trying to run it over large programs with several hundred threads I've
been getting the error "context not found".

The most basic example I can come up with which illustrates the
problem is below. Changing the number of threads started from 25 down
to, say, 10, works fine. Any more than ~25 and the error keeps
appearing. This is using Python 2.6.5 and Ubuntu Linux 10.04. I don't
have another box to try this out on at the moment.

I've tested a similar script using thread.start_new_thread() and that
doesn't seem to have the problem. So is there some issue with Yappi
and inheriting from threading.Thread?

import yappi
import time
import threading

class MyThread(threading.Thread):
    def run(self):
        time.sleep(1)

yappi.start()

for i in range(0,25):
    c = MyThread()
    c.start()
time.sleep(1)

yappi.print_stats()
yappi.stop()


Running the above gives:
[*]     [yappi-err]     context not found.
[*]     [yappi-err]     context not found.
[*]     [yappi-err]     context not found.
[*]     [yappi-err]     context not found.
...

Any help appreciated.