Created on 2015-10-20.10:03:22 by iMichka, last changed 2016-01-22.13:26:43 by iMichka.
|msg10364 (view)||Author: Michka (iMichka)||Date: 2015-10-20.10:03:21|
Hi I was not able to find any bug related to this problem. The bug was probably introduced between jython 2.5.1 and 2.5.2, (and is also present on jython 2.5.3). I am working on Ubuntu 12.04. If I try to execute a simple python file (test.py) containing for example a single line like "a = 1" with loadwatch, the process never ends. With jython 2.5.1: popoff@michka:~$ loadwatch -h 10 -- jython-2.5.1 test.py Tue Oct 20 11:50:52 2015 (3839): child 3840 finished. Tue Oct 20 11:51:02 2015: no child process, exiting. With jython 2.5.2 and 2.5.3 the process never ends (nothing happens): popoff@michka:~$ loadwatch -h 10 -- jython-2.5.3 test.py (hangs indefinitely) The process table looks like this (gotten with ps xf): 3749 pts/6 Ss 0:00 \_ bash 3927 pts/6 S+ 0:00 | \_ loadwatch -h 10 -- jython-2.5.3 test.py 3928 pts/6 T 0:00 | \_ loadwatch -h 10 -- jython-2.5.3 test.py 3929 pts/6 Tl 0:00 | \_ /opt/java6/lib/jvm/java-6/bin/java -Djava.library.path=/usr/lib/jni -Dpython.home=/usr/share/jython-2.5.3 -Dpython.path=/usr/lib/site-python:/usr/share/jython-2.5.3/Lib -Dpython.executable=/usr/bin/jython-2.5.3 -Dpython.cachedir=/home/popoff/.jython-2.5.3-cache -Dpython.console=org.python.util.ReadlineConsole -Dpython.console.readlinelib=Editline org.python.util.jython test.py Maybe this is a known problem ? I can not test jython 2.7 for the moment but I could built it from source to give it a try.
|msg10369 (view)||Author: Jim Baker (zyasoft)||Date: 2015-10-21.22:26:26|
You might try using jython --print to get the specific java command line options used for your program by the Jython launcher; then try using loadwatch with that and see if the process properly terminates. Also Jython 2.7.0 changed the launcher to use CPython, so that's worth trying as well.
|msg10404 (view)||Author: Michka (iMichka)||Date: 2015-10-29.10:05:12|
Hi By testing with --print, you mean: loadwatch -h 10 -- jython-2.5.3 --print This works, the help is printend and the process terminates. So this is only happening when a file is read. I tested with jython 2.7.0 and it is also stuck: loadwatch -h 10 -- /usr/lib/jvm/java-8-openjdk-amd64/bin/java -jar jython-standalone-2.7.0.jar test.py 15103 pts/5 Ss 0:00 \_ bash 16211 pts/5 S+ 0:00 | \_ loadwatch -h 10 -- /usr/lib/jvm/java-8-openjdk-amd64/bin/java -jar jython-standalone-2.7.0.jar test.py 16212 pts/5 T 0:00 | \_ loadwatch -h 10 -- /usr/lib/jvm/java-8-openjdk-amd64/bin/java -jar jython-standalone-2.7.0.jar test.py 16213 pts/5 Tl 0:01 | \_ /usr/lib/jvm/java-8-openjdk-amd64/bin/java -jar jython-standalone-2.7.0.jar test.py 16238 pts/5 T 0:00 | \_ sh -c stty -icanon min 1 -icrnl -inlcr -ixon < /dev/tty 16239 pts/5 T 0:00 | \_ stty -icanon min 1 -icrnl -inlcr -ixon
|msg10668 (view)||Author: Michka (iMichka)||Date: 2016-01-22.09:45:34|
Hi. I just tested again with version 2.7.1b2 and the problem is still there. I wanted to make a git bisect between 2.5.1 and 2.5.2, but it is very difficult because the dependencies have changed a lot and I am even not able to recompile these old Jython versions (even in a clean docker container with the corresponding debian/ubuntu). I'll try to have a look at the jython source code itself, are there some files I should start with (if you have in idea were the problem could be). Thanks in advance.
|msg10669 (view)||Author: Michka (iMichka)||Date: 2016-01-22.13:26:42|
I was able to compile the master branch, and gave it a shot. Using some debug print statements, I found that Jython is stuck in JLineConsole, when creating a new ConsoleReader(). Even when using the ConsoleReader constructor without arguments, Jython is stuck. This probably means that the bug is in Jline. https://github.com/jythontools/jython/blob/master/src/org/python/util/JLineConsole.java#L107 Using a different console (with -Dpython.console=org.python.core.PlainConsole at start) works with loadwatch. This is a first alternative which allows to work with Jython and loadwatch. I will continue to investigate what is going on inside JLine.
|2016-01-22 13:26:43||iMichka||set||messages: + msg10669|
|2016-01-22 09:45:34||iMichka||set||messages: + msg10668|
versions: + Jython 2.7
messages: + msg10369