Messages in this thread |  | | Date | Tue, 12 Jun 2001 11:39:36 -0700 (PDT) | From | Davide Libenzi <> | Subject | RE: threading question |
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On 12-Jun-2001 ognen@gene.pbi.nrc.ca wrote: > Hello, > > I am a summer student implementing a multi-threaded version of a very > popular bioinformatics tool. So far it compiles and runs without problems > (as far as I can tell ;) on Linux 2.2.x, Sun Solaris, SGI IRIX and Compaq > OSF/1 running on Alpha. I have ran a lot of timing tests compared to the > sequential version of the tool on all of these machines (most of them are > dual-CPU, although I am also running tests on 12-CPU Solaris and 108 CPU > SGI IRIX). On dual-CPU machines the speedups are as follows: my version > is 1.88 faster than the sequential one on IRIX, 1.81 times on Solaris, > 1.8 times on OSF/1, 1.43 times on Linux 2.2.x and 1.52 times on Linux 2.4 > kernel. Why are the numbers on Linux machines so much lower? It is the > same multi-threaded code, I am not using any tricks, the code basically > uses PTHREAD_CREATE_DETACHED and PTHREAD_SCOPE_SYSTEM and the thread stack > size is set to 8K (but the numbers are the same with larger/smaller stack > sizes). > > Is there anything I am missing? Is this to be expected due to Linux way of > handling threads (clone call)? I am just trying to explain the numbers and > nothing else comes to mind....
How is your vmstat while your tool is running ?
- Davide
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