IV19920: JAVA JIT - RARE PERFORMANCE PROBLEM WITH LARGE APPLICATIONS
Closed as program error.
Error Message: JVM slows after a executing for a long time without a problem. . Stack Trace: N/A . The application needs to be large enough to run into the JIT code cache limit. The performance problem will only be noticeable in applications executing the same code on several threads. The performance problem is very hard to hit and it will be nearly impossible for customers to hit the problem for a second time.
The problem can be avoided by using the following Java command line option: -Xjit:disableProfiling This option will have a negative effect on performance, but not to the same extent as is seen when the this problem occurs.
For hot methods the JIT will generate a "profiling" JIT compiled body. The execution of this body collects profiling information that is used later when we recompile the method. If we exhaust the JIT code cache before the recompile happens we end up being stuck executing a profiled body which, under some circumstances can have a major performance impact.
This defect will be fixed in: 6.0.1 SR2 7.0.0 SR1 . The JIT will avoid making profiled bodies when we are close to running out of JIT code cache space.
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APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
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