[vtk-developers] suggestion for vtkMultiThreader.cxx

[Lisa Sobierajski Avila]

Hello Simon,

There are this->NumberOfThreads threads running - this->NumberOfThreads-1 
are created, and the parent thread runs too.

Lisa


At 10:43 PM 6/4/2001, Simon Warfield wrote:

>vtkMultiThreader.cxx in some places uses a strategy of starting
>this->NumberOfThreads-1 additional threads to run work in separate threads
>and runs a pthread_join to wait for these jobs to complete.
>
>   The thread running the pthread_join is suspended until the thread it is
>waiting for finishes.  If there are this->NumberOfThreads CPUs available
>for work then running only this->NumberOfThreads-1 jobs wastes wallclock time.
>   It would be better to run this->NumberOfThreads of jobs.
>
>
>vtkMultiThreader.cxx lines 322-341:
>   // Using POSIX threads
>   //
>   // We want to use pthread_create to start this->NumberOfThreads-1 
> additional
>   // threads which will be used to call this->SingleMethod(). The
>   // parent thread will also call this routine.  When it is done,
>   // it will wait for all the children to finish.
>   //
>   // First, start up the this->NumberOfThreads-1 processes.  Keep track
>   // of their process ids for use later in the pthread_join call
>
>--
>Simon Warfield, Ph.D. warfield at bwh.harvard.edu Phone:617-732-7090
>http://www.spl.harvard.edu/~warfield           FAX:  617-582-6033
>Thorn 329, Brigham and Women's Hospital, Harvard Medical School
>Department of Radiology, 75 Francis St, Boston, MA, 02115
>
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