Re: [jdt-core-dev] how to use pre-build jdt index files?

[Daniel Megert <daniel_megert@xxxxxxxxxx>]

> I’m
not sure whether jdt index has bug in reuse existed index mechanism or
not.

If startup is slower with pre-built
indexes then this is a bug and should be reported together with a reproducible
test case.

Dani

From:	"Wang, Simon" <Yunfeng.Wang@xxxxxxxx>
To:	"Eclipse JDT Core developers list." <jdt-core-dev@xxxxxxxxxxx>,
Cc:	"jdt-core-dev-bounces@xxxxxxxxxxx" <jdt-core-dev-bounces@xxxxxxxxxxx>
Date:	30.11.2012 10:18
Subject:	Re: [jdt-core-dev] how to use pre-build jdt index files?

---

Thanks for your reply.
 
> It can contribute to eclipse performance
since indexing time is saved in the presence
> of prebuilt index files. Thus you should see better startup times
if a project uses 
> large static jars. Of course improvements will be noticeable only
if indexing time 
> is significant in the first place.
 
But from my experience, whole
startup time is longer when I use existed index files.
Index time should be significant,
if not use pre-built index files, all index files would be 90mb.
Currently, eclipse generated
index files only 16mb.
It means we reused about
74mb index files.
 
I did see indexing seems
to be blocked for about 1 minute.
I’m not sure whether jdt
index has bug in reuse existed index mechanism or not.
 
Regards
Simon
From: jdt-core-dev-bounces@xxxxxxxxxxx
[mailto:jdt-core-dev-bounces@xxxxxxxxxxx]
On Behalf Of Srikanth S Adayapalam
Sent: 2012年11月30日
15:16
To: Eclipse JDT Core developers list.
Cc: Eclipse JDT Core developers list.; jdt-core-dev-bounces@xxxxxxxxxxx
Subject: Re: [jdt-core-dev] how to use pre-build jdt index files?
 
> From: "Wang, Simon" <Yunfeng.Wang@xxxxxxxx>
> Sent by: jdt-core-dev-bounces@xxxxxxxxxxx
> 
> Jdt build process will reuse existed index files from my box, so 
> that I assume jdt could use less time to parse jars to get indexs.

JDT build process does not use any files index files whether prebuilt
or ordinarily generated. 
  
> If can’t reduce time, does it mean it can’t contribute to eclipse
performance? 
> But from guide, it claimed use existed indexes could improve performance…

It can contribute to eclipse performance since indexing time is saved in
the presence 
of prebuilt index files. Thus you should see better startup times if a
project uses 
large static jars. Of course improvements will be noticeable only if indexing
time 
is significant in the first place.

Srikanth 


>   
> Regards 
> Simon 
> From: jdt-core-dev-bounces@xxxxxxxxxxx
[mailto:jdt-core-dev-
> bounces@xxxxxxxxxxx]
On Behalf Of Srikanth S Adayapalam
> Sent: 2012年11月29日 13:25
> To: Eclipse JDT Core developers list.
> Cc: Eclipse JDT Core developers list.; jdt-core-dev-bounces@xxxxxxxxxxx
> Subject: Re: [jdt-core-dev] how to use pre-build jdt index files?
>   
> The build process itself does not use any indexing information and
> so cannot contribute to 
> increased build times in and of itself. Not sure what else is at play.
> 
> Srikanth 
> 
> 
> jdt-core-dev-bounces@xxxxxxxxxxx
wrote on 11/28/2012 12:17:12 PM:
> 
> > From: "Wang, Simon" <Yunfeng.Wang@xxxxxxxx>
> > To: "Eclipse JDT Core developers list." <jdt-core-dev@xxxxxxxxxxx>,
> > Date: 11/28/2012 12:16 PM 
> > Subject: Re: [jdt-core-dev] how to use pre-build jdt index files?
> > Sent by: jdt-core-dev-bounces@xxxxxxxxxxx
> > 
> > Thanks Markus! 
> >   
> > I generated index files first. 
> > Then developed plugin to configure classpath entries by 
> > “entryDescriptor.setClasspathAttribute
> > (IClasspathAttribute.INDEX_LOCATION_ATTRIBUTE_NAME, indexFile.toURL
> > ().toString());” 
> >   
> > After launch eclipse and import maven projects, I found jdt do
reuse
> > existed index files. 
> > But it took longer time to complete build workspace job. 
> >   
> > I have about 15 maven projects, before took 5 mins to build workspace.
> > Now, it took more than 6 mins to build workspace… 
> >   
> > Is that expected result? I think pre-built index files should
faster
> > build workspace, right? 
> >   
> > Regards 
> > Simon 
> > From: jdt-core-dev-bounces@xxxxxxxxxxx
[mailto:jdt-core-dev-
> > bounces@xxxxxxxxxxx]
On Behalf Of Markus Keller
> > Sent: 2012年11月26日 18:22
> > To: Eclipse JDT Core developers list.
> > Subject: Re: [jdt-core-dev] how to use pre-build jdt index files?
> >   
> > As the N&N says, this feature is not directly accessible
for users. 
> > 
> > PDE currently doesn't implement support for adding pre-built
indexes
> > to OSGi bundles. However, this could be implemented similar to
how 
> > source bundles work. 
> > 
> > http://help.eclipse.org/juno/topic/org.eclipse.jdt.doc.isv/guide/
> > jdt_api_searchindex.htm 
> > tells how to use this if you implement your own classpath container.
> > 
> > https://bugs.eclipse.org/356620
has all the history. 
> > 
> > Markus 
> 
> > 
> > From: 
> > 
> > "Wang, Simon" <Yunfeng.Wang@xxxxxxxx>
> > 
> > To: 
> > 
> > "jdt-core-dev@xxxxxxxxxxx"
<jdt-core-dev@xxxxxxxxxxx>,
> > 
> > Date: 
> > 
> > 2012-11-23 06:27 
> > 
> > Subject: 
> > 
> > [jdt-core-dev] how to use pre-build jdt index files? 
> > 
> >   
> > 
> > 
> > 
> > 
> > Hi, 
> >       After 3.8, JDT have JavaIndexer to pre-build
index files for 
> > dependencies.
> > I'm trying to do this.
> >      But my question is: when is the right time
point to generate 
> index files?
> > and how to apply those index files? Just copy those index files
into
> > workspace/.plugins/{jdt.core.folder}?
> > 
> > Regards
> > Simon_______________________________________________
> > jdt-core-dev mailing list
> > jdt-core-dev@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/jdt-core-dev
> > _______________________________________________
> > jdt-core-dev mailing list
> > jdt-core-dev@xxxxxxxxxxx
> > https://dev.eclipse.org/mailman/listinfo/jdt-core-dev
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