jdk-sandbox: hotspot/agent/doc/cireplay.html@51cfdcf21d35 (annotated)

14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	1	<html>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	2	<head>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	3	<title>
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	4	Replay
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	5	</title>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	6	</head>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	7	<body>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	8
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	9	<h1>Compiler replay</h1>
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	10	<p>
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	11	The compiler replay is a function to repeat the compiling process from a crashed java process in compiled method<br>
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	12	This function only exists in debug version of VM
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	13	</p>
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	14	<h2>Usage</h2>
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	15	<pre>
a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	16	First, use SA to attach to the core file, if succeeded, do
a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	17	hsdb> dumpreplaydata <address> \| -a \| <thread_id> [> replay.txt]
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	18	create file replay.txt, address is address of Method, or nmethod(CodeBlob)
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	19	hsdb> buildreplayjars [all \| boot \| app]
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	20	create files:
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	21	all:
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	22	app.jar, boot.jar
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	23	boot:
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	24	boot.jar
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	25	app:
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	26	app.jar
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	27	exit SA now.
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	28	Second, use the obtained replay text file, replay.txt and jar files, app.jar and boot.jar, using debug version of java
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	29	java -Xbootclasspath/p:boot.jar -cp app.jar -XX:ReplayDataFile=<datafile> -XX:+ReplayCompiles ....
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	30	This will replay the compiling process.
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	31
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	32	With ReplayCompiles, the replay will recompile all the methods in app.jar, and in boot.jar to emulate the process in java app.
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	33
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	34	notes:
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	35	1) Most time, we don't need the boot.jar which is the classes loaded from JDK. It will be only modified when an agent(JVMDI) is running and modifies the classes.
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	36	2) If encounter error as "<flag>" not found, that means the SA is using a VMStructs which is different from the one with corefile. In this case, SA has a utility tool vmstructsdump which is located at agent/src/os/<os>/proc/<os_platform>
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	37
95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	38	Use this tool to dump VM type library:
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	39	vmstructsdump libjvm.so > <type_name>.db
14477 95e66ea71f71 6830717: replay of compilations would help with debugging minqi parents: diff changeset	40
17123 a8e62eed2e3e 8011675: adding compilation level to replay data iignatyev parents: 14477 diff changeset	41	set env SA_TYPEDB=<type_name>.db (refer different shell for set envs)

author	jlaskey
	Tue, 23 Jul 2013 12:00:29 -0300
changeset 19089	51cfdcf21d35
parent 17123	a8e62eed2e3e
permissions	-rw-r--r--