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Posted: Tue May 23, 2006 10:33 am
by Cochise
Just wondering about CPU load measurement with HT enabled. Do values displayed by task manager represent the half of the real load for single core CPUs?
<font size=-1>[ This Message was edited by: Cochise on 2006-05-23 11:34 ]</font>
Posted: Wed May 24, 2006 5:14 am
by Cochise
Maybe dumb question.
However, I made some try.
Using HT a CPU load of more than 51% is displayed for tasks requiring 100% of resources with HT disabled.
<font size=-1>[ This Message was edited by: Cochise on 2006-05-24 06:16 ]</font>
Posted: Wed May 24, 2006 5:21 am
by valis
Cpu load will distribute evenly across processors when an app isn't threaded by the programmer so that it has cpu affinity. This means that a 51% load across 'both cpus' is 102%. HT is integer only so imo you're not going to see truly massive performance increases, although specific benchmarks by certain sites and companies may make it seem so.
Posted: Wed May 24, 2006 5:32 am
by Cochise
I havent't done thorough tests, but it seems CPU require a bit more power with HT enabled. Its temperature looks more than 1°C higher (>51% load)
<font size=-1>[ This Message was edited by: Cochise on 2006-05-24 06:34 ]</font>
Posted: Wed May 24, 2006 9:12 am
by Cochise
Repeated the test.
NO effective temperature difference noticed.
However in HT mode CPU load can reach peaks up to 74%
:?
Posted: Thu May 25, 2006 5:46 am
by valis
Is it spiking?
Posted: Thu May 25, 2006 7:38 am
by bronYaur
hyperthreading is only cache and register enance of cpu the OS look the register of cpu like dual processor
<font size=-1>[ This Message was edited by: bronYaur on 2006-05-25 08:39 ]</font>
Posted: Fri May 26, 2006 4:08 am
by Cochise
Spiking? Sorry, I can't exactly understand what you mean.
I can sometimes read that value on a very short lapse...