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This article introduces the relevant knowledge of "jmap heap dump file example analysis". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Using jmap and jhat to analyze dump

Jps queries out the jvm thread pid

Create a snapshot file jmap-dump:live,file=e://a.hprof pid;, which generates a snapshot file of a.hprof on the e disk. The type must be hprof.

Jmap-dump:live,format=b,file=e://b.hprof 4076 uses format=b binary format, which is about 18% smaller than unused files. You can try it yourself.

Jhat [filePath] reads the corresponding file and then parses it using oql syntax

Open localhost:7000, and as a result, many objects in the following can be pass and pulled to the lowest part.

This is the oql query page.

Select sizeof (o), o from [I o where sizeof (o) > 5000 query objects larger than 50K

There is a simple introduction to grammar in help

Use visualVm to view hprof files

Open visualVm JVisualVm

Load

The analysis of this is much better than that of jmap. However, after 9, it seems that jVisualVm is not a built-in tool.

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