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| View Revisions: Issue #20515 | [ All Revisions ] [ Back to Issue ] | ||
| Summary | 0020515: OBCriteria creates contention at JVM | ||
| Revision | 2017-02-15 13:13 by alostale | ||
| Description | OBCriteria is still adding more overhead than OBQuery, after fix 0020485 it is slower. Note this measurement is just for overhead and not for query itself. Profiling attached test cases, it can be seen most of the time is spent in class loading triggered by Hibernate criteria (cpu-time.png). An additional problem is this classloading is synchronized by class name (lock-monitor.png), this in practice means, concurrent threads needs to wait these locks to be released in order to execute the criteria. The problem is the className SessionFactoryImpl.getImplementors receives [1] is not actually a classname but entity name, so ReflectHelper.classForName finally performs a locking Class.forName [2] [1] https://github.com/alostale/hibernate-orm/blob/3.6.3-patched/hibernate-core/src/main/java/org/hibernate/impl/SessionFactoryImpl.java#L827 [^] [2] https://github.com/alostale/hibernate-orm/blob/3.6.3-patched/hibernate-core/src/main/java/org/hibernate/util/ReflectHelper.java#L192 [^] |
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| Revision | 2017-02-15 13:03 by alostale | ||
| Description | OBCriteria is still adding more overhead than OBQuery, after fix 0020485 it is slower. Note this measurement is just for overhead and not for query itself. Profiling attached test cases, it can be seen most of the time is spent in class loading triggered by Hibernate criteria (cpu-time.png). An additional problem is this classloading is synchronized by class name (lock-monitor.png), this in practice means, concurrent threads needs to wait these locks to be released in order to execute the criteria. |
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| Revision | 2017-02-15 12:42 by alostale | ||
| Description | OBCriteria is still adding more overhead than OBQuery, after fix 0020485 it is slower. Note this measurement is just for overhead and not for query itself. |
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| Revision | 2017-02-15 12:38 by alostale | ||
| Description | OBCriteria is still adding more overhead than OBQuery, after fix 0020485 it is twice slower. Note this measurement is just for overhead and not for query itself. |
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