 |
Forums |
Admin Discussion Forums: help Start New Thread
By: Marc Juul
 RE: Segmentation Fault [ reply ]
2011-10-15 04:02
|
I tried switching to Oracle JDK 1.7.0 and uninstalling and reinstalling rjb.
I tried uninstalling rjb and installing the 1.3.0 version.
Still getting the segfault.
|
By: Marc Juul
RE: Segmentation Fault [ reply ]
2011-10-15 03:48
|
I'm having the same issue but on Ubuntu 11.04, rails 3.1 and with a 32 bit processor instead.
If I run Rjb::load in the same method where I'm using it, the problem goes away, but if I load only once during Rails startup I get a segmentation fault when I try to do anything that requires more than the most trivial of resources afterwards. Oddly it doesn't segfault on Rjb::load.
|
By: arton Tajima
RE: Segmentation Fault [ reply ]
2011-04-08 15:01
|
Hi Nunya
Thanks your follow up.
I have no clue now, in your case, only the difference is REE's patch level. And the difference between Rails/DelayedJob and sciript/console is process forking.
So (but I don't believe that) the resolution is JVM 1.6 is not process forking friendly. Ummm but I don't think so.
BTW, I'm happy that you succeeded.
Cheers.
|
By: Nunya Gupta
RE: Segmentation Fault [ reply ]
2011-04-08 14:46
|
Hi!
Thank you for all your effort.
It really is perplexing. As far as I know, I have two identical servers--down to the bit. I installed everything myself and am the only user. Yet the one will only work with 1.5 (after some minor surgery--see my other message).
Just to make sure it wasn't anything with my .jar file, I ran a test with itext.jar (http://itextpdf.com/), and it also produced a segmentation fault.
Oddly, if I commented out the offending initializer that loaded the .jar (called classifier.rb), ran script/console, then followed the same process that classifier.rb performs (i.e., require 'rjb', Rjb::load, etc.), it ran successfully. So...what the heck? Maybe something in the way Rails boots (but _only_ on this machine!) was causing the issue? Trying to run classifier.rb from a pre_initializer didn't work. Another oddity: running the same code from within a model (i.e., not loading it in an initializer) produced a seg fault.
Running the classifier.rb processes from irb worked fine.
At any rate, I'm guessing my case is very rare/edge, and downgrading to Java 1.5 solved the issue. Hopefully my spelunking helps a bit.
|
By: Nunya Gupta
RE: Segmentation Fault [ reply ]
2011-04-08 14:30
|
Well, after 3 days of no luck, I uninstalled all Java JDK's, cleaned out the cruft left behind in the /usr/lib/jvm directory, uninstalled rjb, reinstalled Sun's Java 1.5 JDK (on ubuntu the package is sun-java5-jdk), reset my JAVA_HOME, added it to my PATH, and for good measure added the LD_LIBRARY_PATH, then reinstalled rjb....and it works now. Happy day.
Hopefully this will help others facing the segfault issue--just go with 1.5. It really is odd though, as rjb works fine on an identical machine running Sun Java 6 JDK.
|
By: arton Tajima
RE: Segmentation Fault [ reply ]
2011-04-08 13:45
|
Hi,
I've installed REE (334) on my Linux box. Because I'd like to reproduce the problem.
So, please let me get the most least reproduce case(script fragment). I hope it must be DelayedJob with J2SE object.
It's ridiculous that I suppose the segv was caused by threading issue. But you could successfully run jobs on REE 253. So I can't figure out the cause of the segv.
Thanks.
|
By: Nunya Gupta
RE: Segmentation Fault [ reply ]
2011-04-07 20:14
|
Forgot to answer some questions:
- Yes, myclassfier.jar is in the current directory (rails root).
- Sorry, I made a typo: yes, right side is MYClassifier.getClassfier("file.gz"). This file is also in the current directory (rails root).
|
By: Nunya Gupta
RE: Segmentation Fault [ reply ]
2011-04-07 18:13
|
ruby -v is:
ruby 1.8.7 (2011-02-18 patchlevel 334) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2011.03
Interestingly, on the machine that works, ruby -v is:
ruby 1.8.7 (2010-04-19 patchlevel 253) [x86_64-linux], MBARI 0x6770, Ruby Enterprise Edition 2010.02
Not sure if that matters.
Here is the script/console output:
>> require 'rjb'
=> true
>> p Rjb::load('myclassifier.jar', ['-Xmx400m'])
nil
=> nil
>> $stdout.flush
=> #<IO:0x1cfb9e8>
>> MYClassifier = Rjb::import('name.of.CRFClassifier')
=> #<Rjb::Edu_stanford_nlp_ie_crf_CRFClassifier:0x7713cc8>
>> p MYClassifier
#<Rjb::Com_our_CRFClassifier:0x7713cc8>
=> nil
>> $stdout.flush
=> #<IO:0x1cfb9e8>
>> CLASSIFIER = CRFClassifier.getClassifier("file.gz")
Loading classifier from /var/www/our.app.directory/releases/20110407175841/file.ser.gz ... done [0.5 sec].
=> #<Rjb::Rjb_JavaProxy:0x76bee80>
I _CAN_ successfully load and execute my code from script/console, _IF_ I don't try to preload it in an initializer. However, running it in Rails (Phusion Passenger), or running it from DelayedJob (where it is needed), results in the SegFault.
Again, thank you.
|
By: arton Tajima
RE: Segmentation Fault [ reply ]
2011-04-07 17:54
|
Hi Nunya
It seems jvm is 64bit app, is Ruby also 64bit ?
Please copy&paste the output of 'ruby -v' and please let me see the console output of the script using copy and paste.
require 'rjb'
p Rjb::load('myclassifier.jar', ['-Xmx400m']) # does myclassfier.jar sit on the current directory ?
$stdout.flush
MYClassifier = Rjb::import('name.of.CRFClassifier')
p MYClassifier
$stdout.flush
CLASSIFIER = CRFClassifier.getClassifier("file.gz") # is the right side 'MYClassifier.getClassfier("file.gz") ?
p CRFClassifier
$stdout.flush
|
By: Nunya Gupta
RE: Segmentation Fault [ reply ]
2011-04-07 16:57
|
Hi!
It seems to occur after the Rjb::load.
I am running rjb from an initializer in Rails 2.3.10. I'm using it to set a constant CLASSIFIER text processing jar (this gets accessed throughout the rails application to process text).
commands are:
require 'rjb'
Rjb::load('myclassifier.jar', ['-Xmx400m'])
MYClassifier = Rjb::import('name.of.CRFClassifier')
CLASSIFIER = CRFClassifier.getClassifier("file.gz")
JAVA_HOME is /usr/lib/jvm/java-6-sun/
ruby -rubygems -rrjb -e 'p Rjb::VERSION' returns "1.3.4"
ls -l /etc/alternatives/javac
/etc/alternatives/javac -> /usr/lib/jvm/java-6-sun/bin/javac
java -version
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) 64-Bit Server VM (build 19.1-b02, mixed mode)
Thanks!
|
By: arton Tajima
RE: Segmentation Fault [ reply ]
2011-04-07 15:56
|
When dit you get segmentation falut ? At Rjb::load or Rjb::import ?
Please let me know more details especially rjb version.
Does 'ruby -rubygems -rjb 'p Rjb::VERSION' run ?
|
By: Nunya Gupta
Segmentation Fault [ reply ]
2011-04-07 15:22
|
I get a Segmentation Fault regardless of JDK / JAVA_HOME variable.
I've tried installing the gem against sun-java6-jdk, sun-java5-jdk and openjdk-6-jdk with no luck. Every time I try to run some Java code, I get a Segmentation Fault.
Environment is Ubuntu 10.0.4LTS, Ruby EE 1.8.7
Oddly, I have 2 identical machines: rjb works on one, but not the other.
Any tips/pointers would be much appreciated. I'm not a Java guy--just ruby--so I don't know how to debug this. I've already read everything online about rjb and segmentation fault, but no luck so far.
Thanks
|
|
|
