Java performance awful, any ideas?

Wed Nov 19 04:30:10 GMT 2008

No, but it would help to comment and give the specifics of what you've 
done. Anyone and everyone else that wants Java working better in LTSP 
should also comment. Thanks for the bug #!

Todd O'Bryan wrote:
> There's already a bug report #277069. Should I file another one?
>
> On Tue, Nov 18, 2008 at 11:07 PM, Jordan Erickson
> <jerickson at logicalnetworking.net> wrote:
>   
>> It would greatly help if you filed a bug report for this. Most likely the
>> Ubuntu Java people have no idea about this (from my experience, most
>> non-ltsp devs have little/no knowledge of ltsp in the first place).
>>
>> Cheers,
>> Jordan/Lns
>>
>>
>> Todd O'Bryan wrote:
>>     
>>> OK. I tried the workaround and it did indeed fix my Java problems.
>>> Hopefully a fix will appear soon in the real update channel.
>>>
>>> On Fri, Nov 14, 2008 at 6:40 PM, Todd O'Bryan <toddobryan at gmail.com>
>>> wrote:
>>>
>>>       
>>>> Yeah. I just wondered if anyone knew what the XCB bug might be or
>>>> whether the XCB devs were working on it. :-)
>>>>
>>>> On Fri, Nov 14, 2008 at 6:17 PM, Jordan Erickson
>>>> <jerickson at logicalnetworking.net> wrote:
>>>>
>>>>         
>>>>> "The main difference between these versions appears to be that the Hardy
>>>>> version links
>>>>>
>>>>> to /usr/lib/libxcb-xlib.so.0 and /usr/lib/libxcb.so.1, and the older
>>>>> version
>>>>> does not."
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> I'm guessing it has to do with that. I *just* did the Gutsy file copy
>>>>> today
>>>>> at one school, and it seemed to fix the problem all together with no ill
>>>>> effects (knocks on wood).
>>>>>
>>>>>
>>>>> Cheers,
>>>>> Jordan/Lns
>>>>>
>>>>>
>>>>>
>>>>> Todd O'Bryan wrote:
>>>>>
>>>>>           
>>>>>> Does anyone have any idea what the bug might be and if it's still
>>>>>> present in intrepid? I'll try the fix on Monday and see what
>>>>>> happens...
>>>>>>
>>>>>> On Fri, Nov 14, 2008 at 10:05 AM, Kai Wollweber <wollw at ki.tng.de>
>>>>>> wrote:
>>>>>>
>>>>>>
>>>>>>             
>>>>>>> Am Freitag, den 14.11.2008, 09:44 -0500 schrieb Todd O'Bryan:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>>> I'm trying to run BlueJ (http://www.bluej.org), a fairly modest Java
>>>>>>>> IDE for students. It runs fine on the servers, on my Ubuntu laptop
>>>>>>>> and
>>>>>>>> desktop, but on the clients it's as slow as molasses.
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>> Rhere is already a bug report at launchpad about this issue:
>>>>>>>
>>>>>>> https://bugs.launchpad.net/ubuntu/+source/ia32-libs/+bug/277069
>>>>>>>
>>>>>>>
>>>>>>> I asked Juha in ltsp-discuss mailing-list and his answer gives us a
>>>>>>> workaround:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>>> ----- "Kai Wollweber" <wollw at ki.tng.de> kirjoitti:
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> yesterday I recognized the problem of slow java applications on our
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> ltsp
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> clients. In our case the java program "geonext" is unuseable but
>>>>>>>>> importand for our school. I found your solution posted some weeks
>>>>>>>>> ago:
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>>>> The sluggishness of some Java applications can be solved in Ubuntu
>>>>>>>>>> Hardy by replacing the /usr/lib32/libX11.so.6.2.0 file in Hardy
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> with
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>>> the version in Gutsy (presuming Firefox and Java are 32-bit
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> versions, so
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>>> they use 32-bit libraries).  The main difference between these
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> versions
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>>> appears to be that the Hardy version links
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> to /usr/lib/libxcb-xlib.so.0
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>>> and /usr/lib/libxcb.so.1, and the older version does not.  Similar
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> change
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>>> may work as well with other LTSP distributions that are affected by
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                     
>>>>>>>> this.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> 1.) How can a single file be replaced between different Ubuntu
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> versions?
>>>>>>>>
>>>>>>>> Simply replacing the file (with cp) should be enough, but in
>>>>>>>> case updates should happen to ia32-libs package that contains the
>>>>>>>> /usr/lib32/libX11.so.6.2.0 file, those updates will overwrite the
>>>>>>>> changed file.  dpkg-divert can be used to solve this problem, it can
>>>>>>>> be used to divert file updates to another place (in this case,
>>>>>>>> because
>>>>>>>> the file is a shared library, it should not be in the same directory,
>>>>>>>> otherwise ldconfig will link to the wrong file).
>>>>>>>>
>>>>>>>> You might want to test by simply installing the gutsy version of
>>>>>>>> ia32-libs package, it should work, but I don't recommend that as a
>>>>>>>> permanent solution (it will change many other libraries as well).
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> 2.) Where can I get the file from Gutsy?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> http://packages.ubuntu.com/gutsy-updates/amd64/ia32-libs/download
>>>>>>>>
>>>>>>>> You can unpack deb-archives with (IIRC):
>>>>>>>>
>>>>>>>> (mkdir tmp && cd tmp && ar x ../ia32-libs_2.1ubuntu4_amd64.deb && \
>>>>>>>>  tar -zxf data.tar.gz)
>>>>>>>>
>>>>>>>> You'll find the file there.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> 3.) Are there side effects that probably can affect the system?
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> Perhaps, but I'm not aware of any.
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>>>> 4.) Am I right that the file needs to be replaced in the ltsp
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>                   
>>>>>>>> chroot?
>>>>>>>>
>>>>>>>> No, X-clients use this library, so it needs to be replaced in the
>>>>>>>> ltsp
>>>>>>>> server environment, NOT in the image that is served to terminals.
>>>>>>>>
>>>>>>>> I hope this helps.
>>>>>>>>
>>>>>>>> Juha
>>>>>>>>
>>>>>>>>
>>>>>>>>                 
>>>>>>> --
>>>>>>> edubuntu-users mailing list
>>>>>>> edubuntu-users at lists.ubuntu.com
>>>>>>> Modify settings or unsubscribe at:
>>>>>>> https://lists.ubuntu.com/mailman/listinfo/edubuntu-users
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>             
>>>>> --
>>>>> Jordan Erickson
>>>>> Owner, Logical Networking Solutions
>>>>> http://www.logicalnetworking.net
>>>>> 707-636-5678
>>>>>
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>>>>>
>>>>>
>>>>>           
>>>       
>>     