Menu
I am debugging a memory leak in an application running on Sun's JDK 1.4.2_18. It appears that this version supports the command line param -XX:+HeapDumpOnCtrlBreak which supposedly causes the JVM to dump heap when it encounters a control-break. How does one send this to a background process on a Linux box? It appears that kill signals are the way this ought to work, but I kill -l doesn't report anything that is obviously a Ctrl-Break, at least on my Ubuntu box.
Update: I tested Kill -3 with Sun JDK 1.4.2_18 (_14 was the first to dump heap this way), and it worked. A heap dump file was created, and the process was still running.
685
(ConTRoL-Break) In a Windows PC, holding down the Ctrl key and pressing the Break key cancels the running program or batch file. See Ctrl-C.
Ctrl+A or Home – moves the cursor to the start of a line. Ctrl+E or End – moves the cursor to the end of the line. Ctrl+B or Left Arrow – moves the cursor back one character at a time.
Turned out the way Ctrl-c works is quite simple — it's just a shortcut key for sending the interrupt (terminate) signal SIGINT to the current process running in the foreground. Once the process gets that signal, it's terminating itself and returns the user to the shell prompt.
Then we hit Ctrl+C to terminate the execution.
Ctrl-\ is the UNIX/Linux equivalent of Windows Ctrl-Break. Wikipedia also tells me that you can also use Ctrl-4 or SysRq on the Linux virtual console (I guess you'd need something weird for a normal terminal emulator to pass representations of those key presses (over ssh/telnet)).
169
kill -QUIT might do it (it will generate a thread dump which is generated by ctrl-break on windows. I haven't tried it with the heap dump option though).
43
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
