[vtk-developers] Multithreading with Win32 threads

[Will Schroeder]

I agree with Ken, IMO we should remove hardcoded limits on threads. In fact
I can see creating some specialized code to determine the "optimal" number
of threads (with provisions for manual override). After all in the Nat'l Lab
world that Ken/Sandia resides in, I've heard the dudes talk about hundreds
or thousands of processes, etc....it's evolving fast and we don't want to
have to keep changing this.

W



On Mon, Jan 24, 2011 at 11:14 AM, Moreland, Kenneth <kmorel at sandia.gov>wrote:

>  Why is there a hardcoded maximum in the first place?  It seems to me that
> whatever number you choose now will be excessively high and/or obsolete in
> the coming years as the number of cores per processor grows.
>
> -Ken
>
>
>
> On 1/24/11 8:04 AM, "Bill Lorensen" <bill.lorensen at gmail.com> wrote:
>
> ITK has had the max set to 128 for quite a while.
>
> On Mon, Jan 24, 2011 at 9:53 AM, David Partyka
> <david.partyka at kitware.com> wrote:
> > Sure thing, especially considering one can get a machine with dual
> > Hexa-cores + Hyper Threading resulting in 24 available cores.
> >
> > On Mon, Jan 24, 2011 at 9:39 AM, David Cole <david.cole at kitware.com>
> wrote:
> >>
> >> I think it's just old and leftover, and nobody has yet found a
> compelling
> >> need for more than 8 threads on Windows. It should be fine to increase
> this
> >> number, especially if you actually have a Windows box with more than 8
> >> processors on it.
> >>
> >> Feel free to change your build locally to increase that value. Perhaps
> >> somebody here on the VTK developers list is also contemplating more
> powerful
> >> Window machines these days... Anybody here want to bump this up and
> commit
> >> the change?
> >>
> >>
> >> On Mon, Jan 24, 2011 at 5:11 AM, Pavel Pokutnev
> >> <pavel.pokutnev at googlemail.com> wrote:
> >>>
> >>> Hello vtk-devs,
> >>>
> >>> sorry, but I would like to repeat my question.
> >>> There is a define VTK_MAX_THREADS in "Common/vtkSystemIncludes.h". It
> >>> is defined to 8 for Win32 threads, but for all other platforms to 32.
> >>> What is the cause for this non-conformity?
> >>>
> >>> Best regards,
> >>> Pavel
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>    ****      Kenneth Moreland
>     ***      Sandia National Laboratories
> ***********
> *** *** ***  email: kmorel at sandia.gov
> **  ***  **  phone: (505) 844-8919
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-- 
William J. Schroeder, PhD
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