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CPU Usage

Question asked by SDFGSDFGSDF on Apr 25, 2006
Latest reply on May 16, 2006 by ALEPEREZ

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Hello

I am running ADS 2004A on a Win XP Pro machine with a Pentium IV 3 GHz HyperThreading Processor. In the Windows Task Manager, I observe that the Momentum MomEngine.exe never has more than 50 percent CPU usage. The remaining CPU capacity is used by the System Idle Process. Why is this? Can I allocate more CPU usage to Momentum to speed up simulations? I tried to set the priority of the Momentum process to "high" but nothing changed.

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ALEPEREZ Apr 26, 2006 6:56 AM
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CPU usage will vary depending on if swap space is used (virtual memory) or if a lot of disk I/O is happening. It is also possible that the OS does not correctly report the CPU usage. In any case, it is the OS that does the process management. If given the chance by the OS, momentum.exe should be running at a 100%. I am not sure why the OS would not give a process the full CPU.
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mfredrik Apr 26, 2006 2:10 PM
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If you have a dual-core CPU then the Momentum process will be run by one of the CPU cores => 50% CPU utilization is the max you can get in a dual core CPU with a single Momentum simulation running.

Don't know about your CPU if it is a dual core or not, or if Intel Hyperthreading makes it to look like two CPU's by Windows.

-Mats
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SDFGSDFGSDF May 2, 2006 8:52 PM
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Thanks for your comments. After disabling Hyper Threading in the BIOS, the Momentum simulation engine now exploits 99% of the processor resources. Computations became significantly faster.
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BUSHKA May 16, 2006 7:10 PM
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So now a question is "who needs a hyperthreading and if it is useful at all?
The right answer to my knowledge is that the hyperthreading is useless if the program is not written properly to use this resource.

The other connected to this subject is a question how effectively a double-core CPU uses EM simulator?
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ALEPEREZ May 16, 2006 7:53 PM
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The double core CPU should be useful to be able to continue working efficiently with a PC while one of the processors is 100% occupied with the Momentum process. At least on Windows OS, due to the bad implementation of task prioritization, a user may loose control of the PC (that is, it responds sluggishly) if Momentum uses 100% of the single processor. I know that at least one application, Microsoft Outlook, takes orders of magnitude longer to be able to synchronize emails from a server when a simulation is running. In all these cases, the issue is <i>not</i> memory - I have 2 GB of RAM and the memory consumption of Momentum in these cases is far less than that. It is strictly a bad implementation of multi-tasking on Windows OS. Whether a dual-core CPU really ends up doing better - I'd be happy if anyone can post first hand experiences.
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