-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Wednesday 14 May 2008 15:31 pm, James Sutherland wrote:
I have been testing thread performance on Linux and Mac. My Linux system has two dual-core processors and my Mac has one dual-core processor. Both are intel chips.
For the code snippet given below, the execution time should ideally decrease as the number of threads increases. However, the opposite trend is observed. For example, using -O3 flags on my Linux desktop produces the following timings: 1 Thread: 0.66 sec 2 Threads: 0.9 sec 3 Threads: 1.2 sec 4 Threads: 1.4 sec
I do not have a lot of experience with threads, and was wondering if this result surprises anyone?
If you print a debug message next to your threads.create_thread(); call, you'll see that you are creating more threads than you think you are. - -- Frank -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.6 (GNU/Linux) iD8DBQFIK0L35vihyNWuA4URAvmEAKCR/MEdyxSpTEKCYBLXvnycHesNLACfVRyN YI7DqOs00Q3v7bx04hvxpGU= =bhMj -----END PGP SIGNATURE-----