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Posted to issues@spark.apache.org by "Qifan Pu (JIRA)" <ji...@apache.org> on 2016/07/25 19:52:20 UTC

[jira] [Created] (SPARK-16713) Limit codegen method size to 8KB

Qifan Pu created SPARK-16713:
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             Summary: Limit codegen method size to 8KB
                 Key: SPARK-16713
                 URL: https://issues.apache.org/jira/browse/SPARK-16713
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core, SQL
    Affects Versions: 2.0.0
            Reporter: Qifan Pu


Ideally, we would wish codegen methods to be less than 8KB for bytecode size. Beyond 8K JIT won't compile and can cause performance degradation. We have seen this for queries with wide schema (30+ fields). This is also a major reason for performance regression when we enable fash aggregate hashmap (such as using VectorizedHashMapGenerator.scala).



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