[lkml]   [2001]   [Jun]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRE: threading question

On 12-Jun-2001 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
> 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

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 12:55    [W:0.239 / U:1.044 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site