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标题
From the best practices documentation on Java or JVM Heap for the Proxy servers, it recommends setting the Java Heap to 6GB. If we have appropriate resources on a machine, can that heap be set higher ? -
说明
From the best practices documentation on Java or JVM Heap for the Proxy servers, it recommends setting the Java Heap to 6GB. If we have appropriate resources on a machine, can that heap be set higher or will it cause problems? If it can be set higher, how high?What size should the JVM Heap be?
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解决办法
While there is no maximum allowable/usable JVM heap size, there is a point where the task of managing the threads involved in larger heaps and the associated Garbage Collection outweighs the performance benefits of having the extra threads.You could set the maximum heap size higher, however, our performance test results indicated that there was no further gain to be made in raising the size past 6GB and instead it was better to add a new proxy if further capacity is required.Remember that the recommendation in the Best practice guide is for 6 GB RAM on a VM with 8 GB total RAM AND 8 CPUs (for example, 2 quad cores). The CAM proxy doesn't retain huge amounts of information in memory over time and each request/response is handled and the memory freed very quickly and performance is bound as much by processing throughput as total memory available.Note: It is possible that raising the heap size and not increasing the CPU allocation accordingly could cause a performance degradation.There is no benefit to having more virtual CPUs allocated than physical CPUs exist.
For more information, please refer to Security and Best Practice Guide