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https://issues.apache.org/jira/browse/MADLIB-1342?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Frank McQuillan closed MADLIB-1342.
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Resolution: Fixed
https://github.com/apache/madlib/pull/467
> Mini-batch preprocessor for images - performance issue
> ------------------------------------------------------
>
> Key: MADLIB-1342
> URL: https://issues.apache.org/jira/browse/MADLIB-1342
> Project: Apache MADlib
> Issue Type: Improvement
> Components: Module: Utilities
> Reporter: Frank McQuillan
> Priority: Major
> Fix For: v1.17
>
>
> Improve performance of mini-batch preprocessor for images. May involve
> writing a new matrix aggregation function to support multi-dimensional arrays.
> I have a 2 segment GP5 cluster set up:
> - preprocessing 50k training rows from CIFAR-10 fits into 3 buffers and takes
> ~1 hour (buffer size of 24415 is reported in the summary file) -- i.e. used
> NULL buffer size
> - preprocessing 10k training rows from CIFAR-10 fits into 1 buffer and takes
> ~2 minutes
> More info:
> If I use `buffer_size=5000` it takes 979 sec
> If I use `buffer_size=500` it takes 75 sec
> So I think there is an issue with large buffer sizes
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