[Insight-developers] Clearly something is wrong with ITKv4 multi-threading

[Bradley Lowekamp]

Hans,

That improvement sounds amazing! I look forward to seeing this patch!


Kent,

Just to follow up with my comment. I had previous done just about the same thing Hans did in his patch to the v3 MattesMutualInformation. I was suggesting using the same convention I did there. Specifically what was done here:

https://github.com/Kitware/ITK/blob/master/Modules/Registration/Common/include/itkMattesMutualInformationImageToImageMetric.h#L345

This is not the best way to do it, but if we do it this way consistently, when we come up with a better technique they can be easily all upgraded.

Thanks,
Brad

On Sep 24, 2013, at 9:55 AM, "Johnson, Hans J" <hans-johnson at uiowa.edu> wrote:

> Kent,
> 
> I'm at the MICCAI conference and was able to do some diagnosis in the down
> time today.  I believe that I have a patch that DRASTICALLY improves the
> performance of the test case while preserving the numerical results.
> 
> Old   Code 3414 seconds
> Fixed Code   90 seconds  <-- Yes 90 seconds.
> 
> It's late here in Japan, so I need to do some more validation and style
> cleanup, but I hope to submit a patch tomorrow.
> 
> What I need from you today is that you address the comment in the gerrit
> patch I pushed over the weekend.  Matt and Brad both had comments on ways
> to improve style for consistency.  Once you have a new pull request in
> place, I'll rebase my changes on those.
> 
> Hans
> 
> On 9/24/13 10:49 PM, "Williams, Norman K" <norman-k-williams at uiowa.edu>
> wrote:
> 
>> This is interesting diagnostic work.
>> 
>> If the problem is threads sharing a smart pointer to a transform, could
>> they instead share a plain old const pointer to the transform?  The
>> threads aren't all modifying the transform, are they?
>> --
>> Kent Williams norman-k-williams at uiowa.edu
>> 
>> 
> 
> 
> 
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