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Add more info about JDK

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Add more info about standard tools from OracleJDK/OpenJDK
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grossws 2015-07-09 12:23:17 +03:00
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@ -235,6 +235,7 @@ Notes:
- To know memory status, run and understand the output of `free` and `vmstat`. In particular, be aware the "cached" value is memory held by the Linux kernel as file cache, so effectively counts toward the "free" value. - To know memory status, run and understand the output of `free` and `vmstat`. In particular, be aware the "cached" value is memory held by the Linux kernel as file cache, so effectively counts toward the "free" value.
- Java system debugging is a different kettle of fish, but a simple trick on Oracle's and some other JVMs is that you can run `kill -3 <pid>` and a full stack trace and heap summary (including generational garbage collection details, which can be highly informative) will be dumped to stderr/logs. - Java system debugging is a different kettle of fish, but a simple trick on Oracle's and some other JVMs is that you can run `kill -3 <pid>` and a full stack trace and heap summary (including generational garbage collection details, which can be highly informative) will be dumped to stderr/logs.
Also default JDKs `jps`, `jstat`, `jstack`, `jmap` are quite usefull, take a look at their help. For more advanced cases use something like [SJK by Alexey Rogozin](https://github.com/aragozin/jvm-tools).
- Use `mtr` as a better traceroute, to identify network issues. - Use `mtr` as a better traceroute, to identify network issues.