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32 lines
1.5 KiB
Markdown
32 lines
1.5 KiB
Markdown
# memory
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查看 JVM 内存信息。
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具体字段信息，参考：
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- [MemoryMXBean#getHeapMemoryUsage()](<https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html#getHeapMemoryUsage()>)
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- [MemoryMXBean#getNonHeapMemoryUsage()](<https://docs.oracle.com/en/java/javase/11/docs/api/java.management/java/lang/management/MemoryMXBean.html#getHeapMemoryUsage()>)
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具体代码：
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- https://github.com/alibaba/arthas/blob/master/core/src/main/java/com/taobao/arthas/core/command/monitor200/MemoryCommand.java
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## 使用参考
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```
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$ memory
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Memory used total max usage
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heap 32M 256M 4096M 0.79%
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g1_eden_space 11M 68M -1 16.18%
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g1_old_gen 17M 184M 4096M 0.43%
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g1_survivor_space 4M 4M -1 100.00%
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nonheap 35M 39M -1 89.55%
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codeheap_'non-nmethods' 1M 2M 5M 20.53%
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metaspace 26M 27M -1 96.88%
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codeheap_'profiled_nmethods' 4M 4M 117M 3.57%
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compressed_class_space 2M 3M 1024M 0.29%
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codeheap_'non-profiled_nmethods' 685K 2496K 120032K 0.57%
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mapped 0K 0K - 0.00%
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direct 48M 48M - 100.00%
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```
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