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Re: [tycho-user] What could have triggered the change of the caching behavior of "Adding repository" ?
Now everything makes sense :)

Thank you for help... and demystifying my problem.

Bernd

2012/3/5 Igor Fedorenko <igor@xxxxxxxxxxxxxx>
oops. hit sent too soon button.

Tycho uses soft references for repository metadata cache.

--
Regards,
Igor


On 12-03-05 2:21 AM, Bernd Vogt wrote:
Actually, the VM run out of heap. After increasing Xmx from 128m to 192m
the build succeeded (yes.. my server is weak).

I asked for soft or weak-caching, not because I thought there is the
problem, but to explain myself, what caused the switch from "Adding
repository (cached)" to "Adding repository" at exactly the same time in
build? After increasing the heap, Tycho performs "Adding
repository (cached)" again. This behaviour could be explained with a
memory sensitive cache?

Thanks,
Bernd

2012/3/4 Igor Fedorenko <igor@xxxxxxxxxxxxxx <mailto:igor@xxxxxxxxxxxxxx>>


   As far as I can tell, you have the same repository referenced from
   multiple reactor modules. Parsing repository metadata is rather
   expansive, so Tycho reads it once and then reuses the same repository
   metadata for all modules that reference the repository. Whether this is
   a weak/soft or a hard reference does not matter because complete
   metadata needs to be read in memory and your JVM does not have enough
   heap for that. You need to either increase heap limit or reduce amount
   of metadata (by referencing specific 3.7.x build instead of all
   versions, for example).

   --
   Regards,
   Igor



   On 12-03-04 12:50 PM, Bernd Vogt wrote:

       Most probably it's like you say... my build server is not the
       strongest
       one and I have to keep memory consumption very low.

       Do you have any ideas, what caused Tycho the switch from "Adding
       repository (cached)" to "Adding repository"? Does Tycho make use
       of soft
       or weak caching at this point?

       2012/3/4 Igor Fedorenko <igor@xxxxxxxxxxxxxx
       <mailto:igor@xxxxxxxxxxxxxx> <mailto:igor@xxxxxxxxxxxxxx

       <mailto:igor@xxxxxxxxxxxxxx>>>


           Most likely your build already was on the threshold of
       running out of
           heap. New eclipse version (i.e. 3.7.2) brought additional p2
       metadata
           and pushed the build over the available heap limit.

           --
           Regards,
           Igor


           On 12-03-04 10:32 AM, Bernd Vogt wrote:

               Hi,

               from one day to the other one of my build jobs begun to fail
               because of
               java.lang.OutOfMemoryError: Java heap space. And I'm
       still trying to
               figure out why?

               I noticed a little behavioral change while the
       tycho-surefire-plugin
               tries to resolve the org.eclipse.equinox.launcher from
       my locally
               mirrored Indigo repository. Befor the build started to
       fail, the
               Indo
               repository was already cached by Tycho, but now Tycho
       decides to
               add a
       "fresh" repository, see snippets below (Adding repository
               (cached)  vs.
               Adding repository).

               What could have triggered this behavioral change?

               Neither the build configuration, hardware or software was
               changed nor
               the source code. BUT around this time I have updated the
       local
               Indigo
               mirror with the new 3.7.2 stuff.

               Thanks in advance
               Bernd


               The good old days

       <http://jenkins.sourcepit.org/job/b2_nightly/213/consoleFull>__>__):
               [INFO] --- tycho-surefire-plugin:0.14.1:____test
       (default-test) @
               org.sourcepit.b2.examples.____simple.module.tests ---


               [...]
               [INFO] Adding repository *(cached)
               *http://p2.sourcepit.org/____eclipse/indigo/
       <http://p2.sourcepit.org/__eclipse/indigo/>


       <http://p2.sourcepit.org/__eclipse/indigo/
       <http://p2.sourcepit.org/eclipse/indigo/>>

               [INFO] Downloading org.eclipse.equinox.launcher
               [...]

               Now

       <http://jenkins.sourcepit.org/job/b2_nightly/209/consoleFull>__>__):
               [INFO] --- tycho-surefire-plugin:0.14.1:____test
       (default-test) @
               org.sourcepit.b2.examples.____simple.module.tests ---
               [...]
               [INFO] Adding repository
       http://p2.sourcepit.org/____eclipse/indigo/
       <http://p2.sourcepit.org/__eclipse/indigo/>


       <http://p2.sourcepit.org/__eclipse/indigo/
       <http://p2.sourcepit.org/eclipse/indigo/>>
               [ERROR] Java heap space -> [Help 1]
               java.lang.OutOfMemoryError: Java heap space


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