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1) quick start
https://arthas.aliyun.com/en/doc/quick-start.html
- curl -O https://arthas.aliyun.com/arthas-boot.jar
- java -jar arthas-boot.jar
2) dashboard 보는법
dashboard
3) thread dump 뜨는법
profiler start -e itimer
profiler stop --format html
3)heapdump /tmp/heap_12210951.hprof
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