[JIRA] [core] (JENKINS-23784) Allow parallel class loading

Wed, 16 Jul 2014 08:43:47 -0700

Issue Type: Improvement Improvement
Assignee: Unassigned
Components: core
Created: 14/Jul/14 9:49 PM
Description:

When running on Java 7, Jenkins should ensure that all its ClassLoader instances are marked parallel-capable. This would improve class loading speed in some circumstances—mainly during startup or when first using new features, but also when searching for Groovy imports and the like.

At least UberClassLoader, DependencyClassLoader, AntClassLoader2, and PluginFirstClassLoader should be so marked. (PluginFirstClassLoader ought to be made to extend AntClassLoader2 since we control it; all superclasses must be marked.) To work on Java 7, can use this idiom:

try {
    Method m = ClassLoader.class.getDeclaredMethod("registerAsParallelCapable");
    m.setAccessible(true);
    boolean b = (Boolean) m.invoke(null);
    if (!b) {
        ...warn...
    }
} catch (NoSuchMethodException x) {
    // fine, Java 6
} catch (Exception x) {
    ...warn...
}


(Unfortunately this pattern must be repeated in such class, since registerAsParallelCapable is caller-sensitive.)
Project: Jenkins
Labels: classloader performance threads
Priority: Major Major
Reporter: Jesse Glick
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