| author | thartmann |
| Fri, 24 Aug 2018 08:17:23 +0200 | |
| changeset 51514 | 1e332d63bd96 |
| parent 47216 | 71c04702a3d5 |
| permissions | -rw-r--r-- |
| 1 | 1 |
<html> |
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<head> |
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<title> |
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Using HotSpot Serviceability Agent (SA) |
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</title> |
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</head> |
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<body> |
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<h1>Using HotSpot Serviceability Agent (SA)</h1> |
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<h3>HSDB GUI</h3> |
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<p> |
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The top-level GUI program using the HotSpot Serviceability Agent APIs is |
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called <b>HSDB</b>, the "HotSpot Debugger". To run it, type "hsdbproc.sh" |
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or "hsdbwindbg.bat" or 64-bit variants (on Unix, Windows platforms |
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respectively). More info. on HSDB GUI are in <a href="hsdb.html">hsdb.html</a>. |
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</p> |
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<h3>SA Modes</h3> |
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<p> |
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There are three modes for the SA debugger: |
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<ul> |
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<li>attaching to a local process, |
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<li>opening a core file, and |
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<li>attaching to a remote "debug server". |
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</ul> |
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<p> |
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The remote case requires two programs to be running on the remote machine: |
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the rmiregistry (see the script "start-rmiregistry.sh" in this directory; |
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run this in the background) and the debug server (see the script |
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"start-debug-server-proc.sh"), in that order. start-rmiregistry.sh takes no |
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arguments; start-debug-server-proc.sh (or -windbg.bat) takes as argument |
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the process ID or the executable and core file names to allow remote debugging |
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of. |
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</p> |
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<h3>Command line HSDB</h3> |
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<p> |
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There are also command line HSDB variants ("clhsdbproc.sh" or "clhsdbwindbg.bat"
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or 64-bit variants). There is also a JavaScript based command line interface |
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called "jsdbproc.sh" [or "jsdbwindbg.bat" or 64-bit variants]. More details on |
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command line interfaces can be found in |
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<ul> |
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<li><a href="clhsdb.html">clhsdb.html</a> |
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<li><a href="jsdb.html">jsdb.html</a> |
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</ul> |
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</p> |
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<h3>Other command line tools</h3> |
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<p> |
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The following table lists all SA command line tools. <xxx>windbg.bat |
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files are for Windows. .sh files are for Solaris. <xxx>64.sh are for |
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64 bit debugees. |
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</p> |
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<table border="1"> |
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<tr> |
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<th> |
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Tool |
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</th> |
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<th> |
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Description |
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</th> |
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</tr> |
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<tr> |
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<td> |
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dumpflagsproc.sh, |
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dumpflagsproc64.sh, |
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dumpflagswindbg.bat |
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dumpflagswindbg64.bat |
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</td> |
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<td> |
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dumps name and value of all -XX JVM command line arguments passed |
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to debuggee. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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<a name="dumpsysprops"></a> |
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dumpsyspropsproc.sh, |
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dumpsyspropsproc64.sh, |
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dumpsyspropswindbg.bat |
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dumpsyspropswindbg64.bat |
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</td> |
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<td> |
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This prints name and value of Java level System properties. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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<a name="heapdump"></a> |
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heapdumpproc.sh, |
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heapdumpproc64.sh, |
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heapdumpwindbg.bat |
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heapdumpwindbg64.bat |
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</td> |
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<td> |
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Dumps heap in a file in hprof binary format. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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<a name="heapsum"></a> |
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heapsumproc.sh, |
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heapsumproc64.sh, |
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heapsumwindbg.bat |
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heapsumwindbg64.bat |
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</td> |
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<td> |
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Prints summary information on Java heap. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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jcoreproc.sh, |
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jcoreproc64.sh, |
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jcorewindbg.bat |
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jcorewindbg64.bat |
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</td> |
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<td> |
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This can retrieve .class files from the debuggee. |
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set the environment variable <b>JCORE_PACKAGES</b> to comman separated list of |
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packages whose classes have to be retrieved from the core file. |
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</td> |
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</tr> |
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<tr> |
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<tr> |
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<td> |
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jstackproc.sh, |
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jstackproc64.sh, |
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jstackwindbg.bat |
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jstackwindbg64.bat |
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</td> |
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<td> |
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used to get java stack trace for all java threads. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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jhistoproc.sh, |
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jhistoproc64.sh, |
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jhistowindbg.bat |
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jhistowindbg64.bat |
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</td> |
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<td> |
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used to get object histogram of java heap. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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permstatproc.sh, |
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permstatproc64.sh, |
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permstatwindbg.bat |
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permstatwindbg64.bat |
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</td> |
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<td> |
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To gather statistics on perm. generation. |
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</td> |
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</tr> |
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<a name="mixed_pstack"></a> |
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<tr> |
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<tr> |
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<td> |
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pstackproc.sh, |
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pstackproc64.sh, |
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pstackwindbg.bat |
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pstackwindbg64.bat |
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</td> |
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<td> |
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This is cross platform mixed mode pstack utility. This works on any (non-java as well) process, core dump. For java process and core dumps, this prints both java and C/C++ frames. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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pmapproc.sh, |
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pmapproc64.sh, |
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pmapwindbg.bat |
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pmapwindbg64.bat |
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</td> |
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<td> |
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This is cross platform Solaris pmap-like utility. |
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</td> |
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</tr> |
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<tr> |
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<td> |
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soqlproc.sh, |
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soqlproc64.sh, |
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soqlwindbg.bat |
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soqlwindbg64.bat |
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</td> |
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<td> |
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This is command line SOQL - Simple Object Query Language tool. |
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SOQL is SQL-like query language to query Java heap. |
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</td> |
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<tr> |
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<td> |
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start-debug-server-proc.sh, |
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start-debug-server-proc64.sh, |
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start-debug-server-windbg.bat, |
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start-debug-server-windbg64.bat, |
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start-rmiregistry.bat, |
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start-rmiregistry64.bat, |
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start-rmiregistry.sh |
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start-rmiregistry64.sh |
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</td> |
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<td> |
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These scripts are used to run SA remotely. |
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</td> |
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</tr> |
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</table> |
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95e66ea71f71
6830717: replay of compilations would help with debugging
minqi
parents:
1
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<h3>C2 Compilation Replay</h3> |
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6830717: replay of compilations would help with debugging
minqi
parents:
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<p> |
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6830717: replay of compilations would help with debugging
minqi
parents:
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When a java process crashes in compiled method, usually a core file is saved. |
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6830717: replay of compilations would help with debugging
minqi
parents:
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The C2 replay function can reproduce the compiling process in the core. |
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6830717: replay of compilations would help with debugging
minqi
parents:
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<a href="c2replay.html">c2replay.html</a> |
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<h3>Debugging transported core dumps</h3> |
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<p> |
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When a core dump is moved from the machine where it was produced to a |
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difference machine, it may not always be possible for SA to debug the same. |
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More info. on debugging on transported core dumps is in |
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<a href="transported_core.html">transported_core.html</a>. |
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</p> |
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<h3>SA Bugs</h3> |
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<p> |
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Not all of the possible states of target VMs have been tested (or |
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supportable) with SA. For example, the SA will probably not work at all |
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if it freezes the target VM during certain phases of GC. When filing bugs |
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a pointer to a core file (see gcore(1)) which the SA can not handle well |
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is best. |
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</p> |
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</body> |
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</html> |