Description
The VM currently starts a large amount of GC threads on systems with many CPUs regardless of the Java heap size.
This doesn't make sense for very small heap sizes.
The number of ParallelGCThreads which currently really get started can be observed by e.g.:
jdk/bin/java -Xmx128m -XX:+PrintFlagsFinal -version|grep GCThreads
The existing option UseDynamicNumberOfGCThreads should be enabled by default to prevent more threads than needed from getting started.
This doesn't make sense for very small heap sizes.
The number of ParallelGCThreads which currently really get started can be observed by e.g.:
jdk/bin/java -Xmx128m -XX:+PrintFlagsFinal -version|grep GCThreads
The existing option UseDynamicNumberOfGCThreads should be enabled by default to prevent more threads than needed from getting started.
Attachments
Issue Links
- csr for
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JDK-8198547 Enable UseDynamicNumberOfGCThreads by default
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- Closed
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- relates to
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JDK-8190937 Always lazily allocate threads in G1
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- Closed
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