调整GC开销超出的参数

问题描述

我需要我的Oracle Hotspot比的默认参数更快地抛出一个异常 java.lang.OutOfMemoryError：超出GC开销限制 UseGCOverheadLimit 。

默认情况下，OOME在超过98％的时间用于GC时发生，并且不到2％的堆已恢复（如）。

例如，我需要我的JVM当超过20％的时间用于GC时抛出OOME。
不幸的是， -XX：GCTimeRatio = nn 似乎没有什么区别。

我需要以这种方式调整我的JVM的原因是我正在测试我的应用程序是否包含内存泄漏（具体而言，我有一个内存泄漏检测基础结构，我想每天测试我们的应用程序），而且我不不需要我的JVM尽可能的努力来释放堆。

解决方案

这两个值是通过 GCHeapFreeLimit 和 GCTimeLimit

GCTimeRatio 只定义了GC启发式将优化的软目标。

I need my Oracle Hotspot to throw an exception java.lang.OutOfMemoryError: GC overhead limit exceeded much sooner than with the default parameters of UseGCOverheadLimit.

By default, OOME occurs when more than 98% of the time is spent in GC and less than 2% of the heap is recovered (described http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html#par_gc.oom).

For instance, I need my JVM to throw OOME when more than 20% of the time is spent in GC.Unfortunately, the -XX:GCTimeRatio=nn doesn't seem to make a difference.

The reason I need to adjust my JVM in this way is that I'm testing my application whether it contains a memory leak (precisely, I have a memory leak detection infrastructure where I want to test our app on a daily basis) and I don't need my JVM to try as hard as possible to free the heap.

解决方案

These two values are configured via GCHeapFreeLimit and GCTimeLimit

GCTimeRatio only defines a soft goal for which the GC heuristics will optimize.

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