Java performance awful, any ideas?

[Jordan Erickson]

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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>>>       
>
>