[Webware-discuss] WebKit thread deaths cause found?

[James R. P. <zu...@zu...>]

I have been experiencing times when my Webware site
at http://zunzun.com will simply stop running, cause
unknown.  Investigation to date shows that there is some
thread problem, which I would like to discuss.

Below is a simple Python program to test multithreading.
This program runs smoothly and quickly on my home
Windows XP computer as expected.  On the Linux server
where my site resides, it runs slowly and jerkily,
finally ending with the message "Killed".  I would
like to ask that others please try this program and
see how it runs on their computers, this may be why
people occasionally report unexplainable WebKit site
applications stopping.

If there is a problem with my test code, please let
me know.  I do not see one and don't know why it runs
differently on the two computers I have access to.

     James Phillips
     http://zunzun.com

import os, sys, thread

loopCount = 1000
threadCount = 20
threadsRunning = 1
threadsTotal = 0
t = 0
lock = thread.allocate_lock()

def ThreadTest():
    global threadsTotal, threadsRunning, lock
    lock.acquire()
    threadsTotal += 1
    threadsRunning -= 1
    lock.release()

print "Starting new threads"
for i in range(loopCount):
    threadsRunning = threadCount
    for threads in range(threadCount):
        thread.start_new(ThreadTest, ())

    while threadsRunning > 0:
        lock.acquire()
        if threadsTotal != t:
            print threadsTotal,
            sys.stdout.flush()
            t = threadsTotal
        lock.release()

print
print "OK for", threadsTotal, "threads -",  threadCount, "threads running
in parallel", loopCount
print