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hotspot/agent/doc/cireplay.html
author jprovino
Mon, 14 Dec 2015 17:06:06 -0500 (2015-12-14)
changeset 35168 927833845cf6
parent 17123 a8e62eed2e3e
permissions -rw-r--r--
8139768: Running with -XX:CMSOldPLABNumRefills=2147483648 causes EXCEPTION_INT_DIVIDE_BY_ZERO on Windows i586 Summary: Use double arithmetic to avoid integer overflow Reviewed-by: jwilhelm, tbenson
<html>
<head>
<title>
Replay
</title>
</head>
<body>

<h1>Compiler replay</h1>
<p>
The compiler replay is a function to repeat the compiling process from a crashed java process in compiled method<br>
This function only exists in debug version of VM
</p>
<h2>Usage</h2>
<pre>
First, use SA to attach to the core file, if succeeded, do
       hsdb&gt; dumpreplaydata &lt;address&gt; | -a | &lt;thread_id&gt; [&gt; replay.txt]
       create file replay.txt, address is address of Method, or nmethod(CodeBlob)
       hsdb&gt; buildreplayjars [all | boot | app]
       create files:
         all:
           app.jar, boot.jar
         boot:
           boot.jar
         app:
           app.jar
       exit SA now.
Second, use the obtained replay text file, replay.txt and jar files, app.jar and boot.jar, using debug version of java
       java -Xbootclasspath/p:boot.jar -cp app.jar -XX:ReplayDataFile=&lt;datafile&gt; -XX:+ReplayCompiles ....
       This will replay the compiling process.

       With ReplayCompiles, the replay will recompile all the methods in app.jar, and in boot.jar to emulate the process in java app.

notes:
       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.
       2) If encounter error as "&lt;flag&gt;" 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/&lt;os&gt;/proc/&lt;os_platform&gt;

       Use this tool to dump VM type library:
       vmstructsdump libjvm.so &gt; &lt;type_name&gt;.db

       set env SA_TYPEDB=&lt;type_name&gt;.db (refer different shell for set envs)
jdk-sandbox