RFR: JDK-8211727: Adjust default concurrency settings for running tests on Sparc

Erik Joelsson erik.joelsson at oracle.com
Tue Nov 13 22:19:21 UTC 2018

I didn't know. Updated references to SPARC.



On 2018-11-13 14:10, Tim Bell wrote:
> Erik:
> One nit: for trademark purposes SPARC is used in upper case [1].
> Looks good otherwise.
> Tim
> [1] Aside from appearing lowercase in URLs, it seems:
>     https://sparc.org/trademark-usage-guide
>     https://www.oracle.com/servers/sparc/
>> This patch changes the formula for default test concurrency in
>> RunTest.gmk. The current formula is:
>> min(cpus/2, 12)
>> This seems to work well enough on the x64 machines we currently run our
>> tests on, but less so for Sparc. I have now run rather extensive testing
>> in our lab and have come up with a new formula that provides much better
>> test reliability while preserving as much test throughput as possible.
>> The new formula is cpus/4 for sparcs with up to 16 cpus and cpus/5 for
>> larger machines. For non Sparc it's still cpus/2 and I've removed the
>> cap for all.
>> In addition to this, since Sparc generally have lower per thread
>> performance, at least when running JDK tests, I have bumped the default
>> timeout factor from 4 to 8 for Sparc.
>> With these defaults, we were able to remove a lot of special cases for
>> Sparc in other parts of our configurations and I was able to get clean
>> runs of all the lower tiers of testing, on each of our machine classes
>> in the lab.
>> In addition to this, the test
>> compiler/jsr292/ContinuousCallSiteTargetChange.java, which had its
>> timeout increased in JDK-8212028, no longer needs an increased timeout
>> with the new defaults.
>> Bug: https://bugs.openjdk.java.net/browse/JDK-8211727
>> Webrev: http://cr.openjdk.java.net/~erikj/8211727/webrev.01/
>> /Erik

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