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Multiple instances of Splus on dual CPU

To: s-news@lists.biostat.wustl.edu
Subject: Multiple instances of Splus on dual CPU
From: "tomas mann" <mann_tomas@hotmail.com>
Date: Tue, 29 Jul 2003 18:40:42 +0000
I am running Splus 6.1 Windows on dual hyperthreaded Xeon 2.8G, MSFT 2000 Advanced Server. When I run 1 instance of Splus, CPU utilization is about 35-40% and only one of the 4 logical CPUs- seems to be engaged (according to the Task Manager). My job runs for let's say 5 minutes. Now, when I run in parallel a second instance of Splus and run on it a job identical to the 1st one, the CPU utilization goes up to 80-100% and all 4 logical CPU-s are engaged but it still takes 10 minutes (instead of the expected 5) to complete the 2 identical jobs on the 2 separate instances of Splus???

I did create 2 separate project folders for the 2  instances of Splus...

Any insight of what is going on and how to "properly" take advantage of the "extra" CPU capacity?
Thank you , Tomas

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