Hi Tony The Values I had were: (Sun 2.8, Python2.1, 4 Processor) creating task 1 creating task 2 creating task 3 creating task 4 creating task 5 creating task 6 creating task 7 creating task 8 creating task 9 creating task 10 waiting for all tasks to complete task 1 will run for 6.7 sec task 2 will run for 4.3 sec task 3 will run for 7.3 sec task 4 will run for 9.3 sec task 5 will run for 1.1 sec task 6 will run for 4.5 sec task 7 will run for 4.1 sec task 8 will run for 3.9 sec task 9 will run for 6.3 sec task 10 will run for 5.8 sec task 5 done task 8 done task 7 done task 2 done task 6 done task 10 done task 9 done task 1 done task 3 done task 4 done all tasks done And for the Sun 2.7, Intel 1xProcessor: creating task 1 creating task 2 creating task 3 creating task 4 creating task 5 creating task 6 creating task 7 creating task 8 creating task 9 creating task 10 waiting for all tasks to complete task 1 will run for 0.1 sec task 2 will run for 5.0 sec task 3 will run for 4.4 sec task 4 will run for 1.3 sec task 5 will run for 4.0 sec task 6 will run for 3.8 sec task 7 will run for 4.0 sec task 8 will run for 5.6 sec task 9 will run for 2.2 sec task 10 will run for 1.2 sec task 1 done task 10 done task 4 done task 9 done task 6 done task 5 done task 7 done task 3 done task 2 done task 8 done all tasks done Does that help at all? What did I prove with that? Whats this ***Barrier*** thing? I'll test on my private Linux box on the weekend. Regards Oliver -- GMX - Die Kommunikationsplattform im Internet. http://www.gmx.net