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https://issues.apache.org/jira/browse/SPARK-20443?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15983059#comment-15983059
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Peng Meng commented on SPARK-20443:
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Yes, based on my current test, I agree.
But if the data size is large, maybe there is benefit to adjust block size.
> The blockSize of MLLIB ALS should be setting by the User
> ---------------------------------------------------------
>
> Key: SPARK-20443
> URL: https://issues.apache.org/jira/browse/SPARK-20443
> Project: Spark
> Issue Type: Improvement
> Components: ML, MLlib
> Affects Versions: 2.3.0
> Reporter: Peng Meng
> Priority: Minor
>
> The blockSize of MLLIB ALS is very important for ALS performance.
> In our test, when the blockSize is 128, the performance is about 4X comparing
> with the blockSize is 4096 (default value).
> The following are our test results:
> BlockSize(recommendationForAll time)
> 128(124s), 256(160s), 512(184s), 1024(244s), 2048(332s), 4096(488s), 8192(OOM)
> The Test Environment:
> 3 workers: each work 10 core, each work 30G memory, each work 1 executor.
> The Data: User 480,000, and Item 17,000
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