[Insight-developers] Multi-threading strategies

[Blezek, Daniel J (GE, Research)]

My take on the status of ZThreads is that the author wrapped up the API,
changed the license to MIT and then when to work for IBM.  He was a
student before.  I found the API to be well documented using Doxygen,
and extremely well written about in C++ Practical Programming
(http://www.linuxtopia.org/online_books/programming_books/c++_practical_
programming/index.html) in this chapter
(http://www.linuxtopia.org/online_books/programming_books/c++_practical_
programming/c++_practical_programming_260.html)
 
We can hardly do better.  Beyond the thread pool there is a wealth of
other synchronization classes that we could leverage for other purposes
(fast mutexs, latches, etc...).
 
Here is a further comparison, looking at the overhead of ZThreads.  I
created and call update on a median filter ZThread implementation using
an 8 thread pool with varying number of "chunks" of work.  This is on an
8 CPU box.  I don't understand why 11, 13 and 14 give such inconsistent
results.  7-8 seconds is what I get with the standard Median filter as a
benchmark.
 
         Probe Tag    Starts    Stops           Time
     MedianZ 1 Chunk           1            1   28.578938007354736328125
     MedianZ 2 Chunk           1            1   14.76609897613525390625
     MedianZ 3 Chunk           1            1   11.375431060791015625
     MedianZ 4 Chunk           1            1   9.661273956298828125
     MedianZ 5 Chunk           1            1   8.6257951259613037109375
     MedianZ 6 Chunk           1            1   7.953671932220458984375
     MedianZ 7 Chunk           1            1   7.6634509563446044921875
     MedianZ 8 Chunk           1            1   7.311050891876220703125
     MedianZ 9 Chunk           1            1   6.9653728008270263671875
    MedianZ 10 Chunk           1            1   8.026858806610107421875
    MedianZ 11 Chunk           1            1
30.3013870716094970703125
    MedianZ 12 Chunk           1            1   7.3554909229278564453125
    MedianZ 13 Chunk           1            1
30.2663071155548095703125
    MedianZ 14 Chunk           1            1   30.4115161895751953125
    MedianZ 15 Chunk           1            1   7.146190166473388671875

-dan
 

	 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://www.itk.org/mailman/private/insight-developers/attachments/20070911/6571cea2/attachment.html