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From "Dawid Weiss (JIRA)" <j...@apache.org>
Subject [jira] [Created] (LUCENE-4360) Support running the same test suite multiple times in parallel
Date Tue, 04 Sep 2012 19:40:08 GMT
Dawid Weiss created LUCENE-4360:
-----------------------------------

             Summary: Support running the same test suite multiple times in parallel
                 Key: LUCENE-4360
                 URL: https://issues.apache.org/jira/browse/LUCENE-4360
             Project: Lucene - Core
          Issue Type: New Feature
          Components: general/test
            Reporter: Dawid Weiss
            Assignee: Dawid Weiss
            Priority: Trivial
             Fix For: 5.0, 4.0


The current "test execution multiplier" or:
{code}
-Dtests.iters=N
{code}
generates multiple tests (method executions) under a test class (suite). All these tests,
however, are bound to a single class so they must run sequentially and on a single JVM (because
of how JUnit works -- nesting of rules, class hooks, etc.).

Mark pointed out that if somebody has a multi-core CPU then it'd be nice to be able to run
a single suite in parallel, possibly in combination with tests.iters (so that a single test
method is executed X times on Y parallel JVMs).

This is surprisingly easy with the randomized runner because it currently accepts "duplicate"
suite names and will load-balance them in a normal way. So, if one has Y cores (JVMs) then
providing a suite name X times will result in X executions, balanced across Y JVMs.

The only problem is how to "multiply" suite names. This can be done in a number of ways, starting
from a custom resource collection wrapper and ending at a built-in code in the runner itself.
I think the custom collection wrapper approach would be interesting, I'll explore this direction.

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