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[Octave-bug-tracker] [bug #49940] The svd function takes very long time
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From: |
Mike Miller |
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Subject: |
[Octave-bug-tracker] [bug #49940] The svd function takes very long time for big matrices |
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Date: |
Fri, 25 Jan 2019 15:09:16 -0500 (EST) |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36 |
Follow-up Comment #9, bug #49940 (project octave):
I modified liboctave/numeric/svd.cc to print out the elapsed time directly
around both calls to the DGESVD function, and ran the same benchmark script.
The extra output shows that virtually all of the elapsed time taken by each
call to 'svd' at the Octave interpreter level is due to elapsed time in the
DGESVD function itself and not any extra overhead that Octave is adding.
SVD_DRIVER: gesvd, Matrix Size: [2000 2000]
DGESVD[1]: elapsed time = 5.60284e-05
DGESVD[2]: elapsed time = 1.39169
bm1 = 1.4111
DGESVD[1]: elapsed time = 7.15256e-06
DGESVD[2]: elapsed time = 69.9751
bm2 = 70.040
SVD_DRIVER: gesdd, Matrix Size: [2000 2000]
bm21 = 1.6698
bm22 = 2.6572
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