Full GC experience analysis

• Java

Background:

Individual machines: memory suddenly rises and CPU utilization increases.

Solving process

1. Jmap dump entire memory image

2. The whole file is more than 700 m and cannot be opened with jhat

3. Change heapananalyzer to open it, but the memory occupation is not analyzed. Use the command: Java - xmx4096m - jar ha39 jar

4. Change to the mat Eclipse Plug-in and directly open dump Bin file (JVM 10g). Mat plug-in address: http://download.eclipse.org/mat/1.6/update-site/

According to mat's analysis of the dump file on today, it is found that the large object is an ArrayList of string, and the content of string is like a date. Then search the whole project to find out the specific method. There is a while statement, which will enter an endless loop during boundary test, resulting in the continuous increase of memory, and finally heap out of memory.

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