Peng Meng created SPARK-20443:
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Summary: 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 48W, and Item 1.7W
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