[Insight-developers] itk performance numbers

[Bradley Lowekamp]

OK here are some more numbers for the latest patch in gerrit. I will follow Ruperts format as it's the most clear.

MeanSquares:
Threads	3.2		4.2		4.2+patch	patch percentage of 3.20
1		0.3615	0.8214	0.4071		113%
2		0.3222	0.6055	0.3365		104%
4		0.3249	0.4448	0.3293		101%
8		0.1703	0.3093	0.1943		114%
12		0.1457	0.2031	0.1322		91%
24*		0.1062	0.1332	0.0949		89%

MutualInformation:
Threads	3.2		4.2		4.2+patch	patch percentage of 3.20
1		0.1467	0.6103	0.3353		228%
2		0.1036	0.3747	0.1774		171%
4		0.0847	0.2175	0.1262		149%
8		0.0655	0.1291	0.0681		104%
12		0.0551	0.1035	0.0486		88%
24*		0.0460	0.0829	0.0526		114%

*Hyperthreading

The observation to be made about MutualInformation is that while 4.2 it's still slower with one thread, there is a significant increase is speed-up due to threads now.

Brad

On Jul 26, 2012, at 2:02 PM, Rupert Brooks wrote:

> Ok that makes way more sense, sorry i didnt understand first time around.
> 
> Just so i've got it right
> Threads                    3.20                              4.2+patch            Time 4.2 as percent of 3.20
> 1                         0.347567                            0.383342                110.293%
> 2                         0.300869                            0.335328                111.453
> 4                         0.348677                            0.315688                 90.5388
> 8                         0.182681                            0.192132                105.173
> 
> So theres about 10% more time with ITK 4.2 used in the 1 and 2 thread case.  That is definitely better than what we were getting.  Cool.
> 
> Rupert
> 
> --------------------------------------------------------------
> Rupert Brooks
> rupert.brooks at gmail.com
> 
> 
> 
> On Thu, Jul 26, 2012 at 1:13 PM, Bradley Lowekamp <blowekamp at mail.nih.gov> wrote:
> Sorry for not being clear! I got too excited by finding the solution to the performance issue with ITKv3 registration in ITKv4.
> 
> This first is vanilla 3.20, the second is 4.20+ the gerrit patch. The third is the gerrit patch with the pre-malloc of the Jacobin outside the threaded section! Vanilla 4.2 is ~2x 3.20 for this test on my system too.
> 
> Summary for the MeansSquares metric in your test:
> 
> 3.20:  1X
> 4.2: 2+X
> 4.2+gerrit patch: 1X
> 4.2+gerrit patch + single-threaded preallocation of jacobian: 1.5X

========================================================
Bradley Lowekamp  
Medical Science and Computing for
Office of High Performance Computing and Communications
National Library of Medicine 
blowekamp at mail.nih.gov



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