diff --git a/pages/common/jhat.md b/pages/common/jhat.md new file mode 100644 index 0000000000..d5ff16815d --- /dev/null +++ b/pages/common/jhat.md @@ -0,0 +1,11 @@ +# jhat + +> Java Heap Analysis Tool. + +- Analyze a heap dump (from jmap), view via http on port 7000: + +`jhat {{dump_file.bin}}` + +- Analyze a heap dump, specifying an alternate port for the http server: + +`jhat -p {{port}} {{dump_file.bin}}` diff --git a/pages/common/jmap.md b/pages/common/jmap.md new file mode 100644 index 0000000000..b6d819cc03 --- /dev/null +++ b/pages/common/jmap.md @@ -0,0 +1,19 @@ +# jmap + +> Java Memory Map Tool. + +- Print shared object mappings for a java process (output like pmap): + +`jmap {{java_pid}}` + +- Print heap summary information: + +`jmap -heap {{filename.jar}} {{java_pid}}` + +- Print histogram of heap usage by type: + +`jmap -histo {{java_pid}}` + +- Dump contents of the heap into a binary file for analysis with jhat: + +`jmap -dump:format=b,file={{filename}} {{java_pid}}` diff --git a/pages/common/jstack.md b/pages/common/jstack.md new file mode 100644 index 0000000000..93687df2ff --- /dev/null +++ b/pages/common/jstack.md @@ -0,0 +1,15 @@ +# jstack + +> Java Stack Trace Tool. + +- Print java stack traces for all threads in a java process: + +`jstack {{java_pid}}` + +- Print mixed mode (java/c++) stack traces for all threads in a java process: + +`jstack -m {{java_pid}}` + +- Print stack traces from java core dump: + +`jstack {{/usr/bin/java}} {{file.core}}`