On 05/12/2013 08:08 AM, Dean Yu wrote:
Do you also prefetch inherited classes?
No. The prefetching is microscopic, in that it currently looks for
classes that are referenced from the class being requested (in the hope
that those referenced classes are likely needed soon.)
Also, can you measure the number of classes that were prefetched but never used?
Right, ideally I'd produce this in a format that allows some reasoning.
Let's try that.
-- Dean
On Saturday, May 11, 2013 2:10:18 PM UTC-7, Kohsuke Kawaguchi wrote:
(Context: see https://github.com/jenkinsci/remoting/pull/10)
I've got the new code working under the Maven job type to see the effect of
prefetching. Here is the summary of classloader activities in building
https://svn.jenkins-ci.org/trunk/jenkins/test-projects/model-maven-project/
Class loading count=801
Class loading prefetch hit=372 (46%)
Resource loading count=11
The new code manages to avoid sending individual class/resource file images on
the wire completely, and they are instead all retrieved from locally cached jar
files.
The prefetch hit ratio 46% means we were able to cut the number of roundtrips
to 54% of what it was before. Interestingly, this 46% number is very consistent
across different call patterns --- the slave itself had 48% prefetch hit ratio.
I haven't measured the difference in the number of bytes transferred.
I wonder what can be done to further improve the prefetch hit ratio.
The complete call sequence details at https://gist.github.com/kohsuke/5561414
--
Kohsuke Kawaguchi
--
Kohsuke Kawaguchi | CloudBees, Inc. | http://cloudbees.com/
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