Nepomuk using 90%+ CPU

[James Richard Tyrer]

Daniel Winter wrote:
> On Friday 26 September 2008 13:35:05 Anne Wilson wrote:
> 
>>> It will display the help.  Where it explains the "--backend" switch  it
>>> should say something like "Possible backends are: sesame2  redland"
>> Redland is the only possibility given.
>>
>>> If sesame2 is there you are using it. If not that is it what causes the
>>> slow indexing and high cpu usage.
>> Is it possible to add sesame2, or is it just that this version does not yet
>> support it, otherwise it would be there?
> 
> Well, that depends on how you got KDE/Nepomuk installed. (self built  or what 
> distribution)
> 
> All soprano versions support sesame2 and make it default if it is avaible. But 
> sesame2 needs Java and is quite hard to package correctly. That is why some 
> distros do not ship it. 

I think that there might be a problem there.  I had to tell CMake where 
to find Java despite the fact that the JAVA environment variable is set 
(I have JAVA_HOME set as well)  So, I wonder if it uses the JAVA 
environment variable at runtime to find Java.  If not, this will be a 
packaging issue.
> 
> KDE 4.2 will disable strigi when using the redland backend because it is 
> unusable slow for that.
> 
It appears to me that it might be better to also have to option of 
compiling the Java code to binary.  If it could be compiled with GCJ 
then a package would not require Java & JNI but rather the libraries 
that go with GCJ which Linux should find in the usual way.  I don't know 
if GCJ is mature enough to compile the Java code in Sesame2 or if it 
would need to be ported slightly, but this seems like a possible solution.

-- 
JRT
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