Consider changing how we set the number of threads to use to run tests.
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Key: LUCENE-3667
URL: https://issues.apache.org/jira/browse/LUCENE-3667
Project: Lucene - Java
Issue Type: Improvement
Reporter: Mark Miller
Assignee: Mark Miller
Priority: Minor
The current way we set the number of threads to use is not expressive enough
for some systems. My quad core with hyper threading is recognized as 8 CPUs -
since I can only override the number of threads to use per core, 8 is as low as
I can go. 8 threads can be problematic for me - just the amount of RAM used
sometimes can toss me into heavy paging because I only have 8 GB of RAM - the
heavy paging can cause my whole system to come to a crawl. Without hacking the
build, I don't think I have a lot of workarounds.
I'd like to propose that switch from using threadsPerProcessor to threadCount.
In some ways, it's not as nice, because it does not try to scale automatically
per system. But that auto scaling is often not ideal (hyper threading, wanting
to be able to do other work at the same time), so perhaps we just default to 1
or 2 threads and devs can override individually?
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