site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 John, Make sure that System Prefrences->Engery Saver->Options->Processor Performance is set to "Highest". The default of "Automatic" can affect processor performance quite a lot in certain situations. This may be what you are seeing. HTH. On Sep 29, 2004, at 10:00 AM, John Siracusa wrote:
The observed result of the test program is that it runs at X iterations/sec for some time, then drops to X - N iterations/sec for the remainder. The drop seems to coincide with a CPU temp that passes some threshold.
This drop is not seen on any Macs other than the dual 2.5GHz Power Mac. The concern is that people buying a 2.5GHz Mac (at great expense) cannot use the full capacity of the CPUs for more than a short period of time. ... The goal is not to throttle the CPU, but to make it run a particular task using all available CPU resources. Obviously there is some overhead for the OS, etc., but the one-time drop-off in speed on the 2.5GHz Power Mac (and nowhere else when running the same code, same OS, etc.) has led some people to believe that the issue is CPU heat, and that the OS (or maybe even the hardware itself) is compensating for it by slowing down slightly.
-John
Brian Bergstrand <http://www.bergstrand.org/brian/>, AIM: triryche206 PGP Key: <http://www.bergstrand.org/brian/misc/public_key.txt> One of the lessons of history is that nothing is often a good thing to do and always a clever thing to say. - Will Durant -----BEGIN PGP SIGNATURE----- Version: PGP 8.1 iQA/AwUBQVrLi3nR2Fu2x7aiEQKr1QCg9v+FfdzUd/u2lemTGMDD+NrrHEsAni6x 4vnXg+CRuhsW9jj4XU8zMvw3 =gokW -----END PGP SIGNATURE----- _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.appl... This email sent to site_archiver@lists.apple.com