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https://issues.apache.org/jira/browse/SYSTEMML-1140?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Matthias Boehm closed SYSTEMML-1140.
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Resolution: Fixed
Assignee: Matthias Boehm
Fix Version/s: SystemML 1.1
I'm closing this issue since we did not see such overheads after (1) we
modified the buffer pool logic for sparse matrices which now can use shallow
serialize (pointer reference) similar to dense blocks, and (2) we have much
better support for sparse convolution and max pooling operations which avoids
the need for unnecessary dense-sparse conversions.
> Sparse/Caching performance bugs related to deep learning scripts
> ----------------------------------------------------------------
>
> Key: SYSTEMML-1140
> URL: https://issues.apache.org/jira/browse/SYSTEMML-1140
> Project: SystemML
> Issue Type: Bug
> Affects Versions: SystemML 1.0.0, SystemML 1.1
> Reporter: Niketan Pansare
> Assignee: Matthias Boehm
> Priority: Blocker
> Fix For: SystemML 1.1
>
>
> We have identified two performance bugs that frequently occurs in deep
> learning script.
> First, we repeatedly perform unnecessary conversion to sparse format. Also,
> the operations such as matrix multiplication (including BLAS and CuBLAS) are
> optimized for dense.
> Second, even with large memory budget, we sometimes spend almost 20-30% time
> in caching.
> [~mboehm7] [~reinwald] [[email protected]] I am labeling this bug as
> blocker for SystemML 1.0. Please feel free to assign this issue to yourself.
> *Improvements so far:*
> 1. Disabled sparse conversions & caching, by
> [commit|https://github.com/apache/systemml/commit/caaaec90b61e529e50021d89f9f108230fa307a8]
> 2. binary sparse-dense mult/div, preallocation by [commit
> |https://github.com/apache/systemml/commit/4f86485939d4777d2799a697b2cbc23ea93ee7e4]
> 3. For `conv_2d_bias_add`, the `elementWiseInPlaceTransposedAddition` method
> - first, aggreates partial blocks w/o transpose. secondly, does a cache
> conscious transpose to output. by
> [commit|https://github.com/apache/systemml/commit/de1e119de0b2fc2a6c6a2c57bf64c4172a26890d]
> 4. serialization overhead of sparse matrices(in MCSR) on bufferpool write, by
> using inMemorySize of cache block. by [commit
> |https://github.com/apache/systemml/commit/a68648ded00b0dc2510cd16ae8a0e5fa7ae822c3]
> 5. removeEmpty(rows) or order perfomance improved by , shallow copy of sparse
> rows, exploiting the fact that removeEmpty(rows) and order do not modify the
> actual sparse rows. by
> [commit|https://github.com/apache/systemml/commit/4288da9eec006891025379b9fc723cf0e72adeaf]
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