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https://issues.apache.org/jira/browse/MATH-1389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15562626#comment-15562626
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Christoph Dibak commented on MATH-1389:
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Very Interesting! In my application, I have to evaluate 10 to 20 sub-matrices
and got orders of magnitude better performance using the patched version. I'm
running Java version "1.8.0_31" on Linux and also got orders of magnitude
better performance on a Galaxy Note 4 running Android.
What do you mean with "has warmed up"? Maybe your application scenario is a
totally different one compared to a mobile scenario, where we want to have low
latency and low energy consumption.
> Runtime Improvement for getSubMatrix in Array2DRowRealMatrix
> ------------------------------------------------------------
>
> Key: MATH-1389
> URL: https://issues.apache.org/jira/browse/MATH-1389
> Project: Commons Math
> Issue Type: Improvement
> Reporter: Christoph Dibak
> Priority: Trivial
> Attachments: 0001-faster-getSubMatrix-for-Array2DRowRealMatrix.patch,
> MatrixBenchmark.java, RuntimeTestGetSubMatrix.java
>
>
> Using System.arraycopy() for creating sub-matrices in the getSubMatrix()
> method of Array2DRowRealMatrix improves the runtime. Tested for a matrix
> with dimension 50x50, the execution time was 16 times faster.
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