dual core, one thread >50%?

Author	Message
Avi Send message Joined: 2 Aug 06 Posts: 58 Credit: 95,619 RAC: 0	Message 22098 - Posted: 9 Aug 2006, 5:08:57 UTC I thought each thread could only run upto 50%? This is a dual core machine. Incidentally, with einstein paused it still takes up some ram, not just virtual memory. I thought the "preempt" moved it all to swap? Thanks. ID: 22098 · Rating: 0 · rate: / Reply Quote

Elektra* Send message Joined: 12 Nov 05 Posts: 120 Credit: 493,260 RAC: 0	Message 22099 - Posted: 9 Aug 2006, 5:53:49 UTC - in response to Message 22098. I thought each thread could only run upto 50%? This is a dual core machine. No! Dual core means that 2 WUs are run on one processor by default. Each core is 100% busy also by default. Incidentally, with einstein paused it still takes up some ram, not just virtual memory. I thought the "preempt" moved it all to swap? Thanks. No! Swapping to harddisk only if space in RAM is insufficient - business as usual in MS Windows. Love, Michi ID: 22099 · Rating: 0 · rate: / Reply Quote

BennyRop Send message Joined: 17 Dec 05 Posts: 555 Credit: 140,800 RAC: 0	Message 22102 - Posted: 9 Aug 2006, 6:55:38 UTC With my Athlon 64 x2 at work, the max for each thread is 50%. If you pause one of the threads, does it make the other thread pop up to 100%? i.e. is it working in single cpu mode? i.e. does it have the wrong HAL loaded for WinXP? ID: 22102 · Rating: 0 · rate: / Reply Quote

MikeMarsUK Send message Joined: 15 Jan 06 Posts: 121 Credit: 2,637,872 RAC: 0	Message 22104 - Posted: 9 Aug 2006, 7:13:52 UTC A hyperthreaded PC would behave in the way Avi indicates... ID: 22104 · Rating: 0 · rate: / Reply Quote

Richard M Send message Joined: 17 Sep 05 Posts: 13 Credit: 320,417 RAC: 574	Message 22108 - Posted: 9 Aug 2006, 8:39:09 UTC - in response to Message 22098. I thought each thread could only run upto 50%? This is a dual core machine. Incidentally, with einstein paused it still takes up some ram, not just virtual memory. I thought the "preempt" moved it all to swap? Thanks. Could we see a screenshot of the "Performance" tab from task manager. It looks like you have a single processor system running. The performance tab should show two processors running at 100%. TTYL Richard Click the Sig! BOINC Wiki ID: 22108 · Rating: 0 · rate: / Reply Quote

BennyRop Send message Joined: 17 Dec 05 Posts: 555 Credit: 140,800 RAC: 0	Message 22110 - Posted: 9 Aug 2006, 9:38:12 UTC Avi has a T2400 cpu; which is an Intel Core Duo processor. (Dual core) - The Intel Core Solo version of that cpu is the T1400. The Intel Core Duo and Solo cpus aren't supposed to have HT. ID: 22110 · Rating: 0 · rate: / Reply Quote

Avi Send message Joined: 2 Aug 06 Posts: 58 Credit: 95,619 RAC: 0	Message 22117 - Posted: 9 Aug 2006, 12:30:18 UTC - in response to Message 22110. Avi has a T2400 cpu; which is an Intel Core Duo processor. (Dual core) - The Intel Core Solo version of that cpu is the T1400. The Intel Core Duo and Solo cpus aren't supposed to have HT. Indeed, performance tab shows 2 cpu's. So how is one thread using 60%? Usually they are both at 49-50%, so this caught me as very strange. ID: 22117 · Rating: 0 · rate: / Reply Quote

Jack Shaftoe Send message Joined: 30 Apr 06 Posts: 115 Credit: 1,307,916 RAC: 0	Message 22119 - Posted: 9 Aug 2006, 12:55:33 UTC - in response to Message 22099. Last modified: 9 Aug 2006, 12:56:29 UTC I thought each thread could only run upto 50%? This is a dual core machine. No! Dual core means that 2 WUs are run on one processor by default. Each core is 100% busy also by default. That's not what I see on my machine. My dual core shows each thread maxing out at 50%, my quad shows each maxing to 25% and my 8 CPU shows each maxing to 13%. The "CPU" column always adds up to 100%. Could it be a setting in task manager? Have you tried Process Explorer from SysInternals? ID: 22119 · Rating: 0 · rate: / Reply Quote