We've been using jmap for ~2 years to measure heap size on a large, multi-server app, running under Java 6. We take a measurement every minute. Each measurement took (elapsed time) less than 1 second.We've been using jmap for ~2 years to measure h
阅读背景：
在Java 7下，jmap显得较慢，从而减慢了JVM的速度
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