1.Jps
jps 命令参数解析
The jps command supports a number of options that modify the output of the command. These options are
subject to change or removal in the future.
-q
Suppresses the output of the class name, JAR file name, and arguments passed to the main method,
producing only a list of local JVM identifiers.
-m
Displays the arguments passed to the main method. The output may be null for embedded JVMs.
-l
Displays the full package name for the application's main class or the full path name to the
application's JAR file.
-v
Displays the arguments passed to the JVM.
-V
Suppresses the output of the class name, JAR file name, and arguments passed to the main method,
producing only a list of local JVM identifiers.
2.Jstack
jstack命令参数解析
-F
Force a stack dump when jstack [-l] pid does not respond.
-l
Long listing. Prints additional information about locks such as a list of owned
java.util.concurrent ownable synchronizers. See the AbstractOwnableSynchronizer class description
at
http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/locks/AbstractOwnableSynchronizer.html
-m
Prints a mixed mode stack trace that has both Java and native C/C++ frames.
-h
Prints a help message.
-help
Prints a help message.
jstack 常用命令集合
jstack -l 15401 |grep 'java.lang.Thread.State' |wc -l
top
top -H -p [pid]
printf "%x\n" [线程id]
jstack 15401|grep 45d8 -A 30
5.Jstat
class: Displays statistics about the behavior of the class loader.
compiler: Displays statistics about the behavior of the Java HotSpot VM Just-in-Time compiler.
gc: Displays statistics about the behavior of the garbage collected heap.
gccapacity: Displays statistics about the capacities of the generations and their corresponding
spaces.
gccause: Displays a summary about garbage collection statistics (same as -gcutil), with the cause of
the last and current (when applicable) garbage collection events.
gcnew: Displays statistics of the behavior of the new generation.
gcnewcapacity: Displays statistics about the sizes of the new generations and its corresponding spaces.
gcold: Displays statistics about the behavior of the old generation and metaspace statistics.
gcoldcapacity: Displays statistics about the sizes of the old generation.
gcmetacapacity: Displays statistics about the sizes of the metaspace.
gcutil: Displays a summary about garbage collection statistics.
printcompilation: Displays Java HotSpot VM compilation method statistics.
jstat 常用命令集合
jstat -gc pid [interval]
jstack pid > jstack.log
4.Jmap
<no option>
When no option is used, the jmap command prints shared object mappings. For each shared object
loaded in the target JVM, the start address, size of the mapping, and the full path of the shared
object file are printed. This behavior is similar to the Oracle Solaris pmap utility.
-dump:[live,] format=b, file=filename
Dumps the Java heap in hprof binary format to filename. The live suboption is optional, but when
specified, only the active objects in the heap are dumped. To browse the heap dump, you can use the
jhat(1) command to read the generated file.
-finalizerinfo
Prints information about objects that are awaiting finalization.
-heap
Prints a heap summary of the garbage collection used, the head configuration, and generation-wise
heap usage. In addition, the number and size of interned Strings are printed.
-histo[:live]
Prints a histogram of the heap. For each Java class, the number of objects, memory size in bytes,
and the fully qualified class names are printed. The JVM internal class names are printed with an
asterisk (*) prefix. If the live suboption is specified, then only active objects are counted.
-clstats
Prints class loader wise statistics of Java heap. For each class loader, its name, how active it
is, address, parent class loader, and the number and size of classes it has loaded are printed.
-F
Force. Use this option with the jmap -dump or jmap -histo option when the pid does not respond. The
live suboption is not supported in this mode.
jmap 常用命令集合
jmap -dump:format=b,file=/Users/scott/tmp/temp.dat [pid]
jhat -port 9998 /Users/scott/tmp/temp.dat
