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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