JTreg spawns java processes and uses all memory with CONCURRENCY=auto

Mike Duigou mike.duigou at oracle.com
Mon May 20 16:02:01 PDT 2013

The biggest issue with any concurrency auto or a specific number in practice seems to be that VMs are not provided a maximum size and are dependent upon the default "VM ergonomics" sizing. With default sizing, on most machines you will run out memory before you run out of cores.

There's a current effort (JDK-8014819) to specify a default VM size to be used by the test vm instances which should help things. For the moment I wouldn't suggest using more than CONCURRENCY=4.


On May 20 2013, at 13:59 , Tomasz Kowalczewski wrote:

> Hello,
> during a recent "Adopt OpenJDK" event held in Krakow I was using jtreg for running OpenJDK test cases. It was set up as per instructions published here: https://java.net/projects/adoptopenjdk/pages/InstallJtreg
> OpenJDK repository was cloned from http://hg.openjdk.java.net/jdk8/tl and jtreg version was jtreg-4.1-bin-b05_29_nov_2012.zip
> I have set 'CONCURRENCY=auto' environment variable.
> When running a test suite (.e.g.: 'cd jdk8_tl/test; make jdk_util') jtreg spawns a lot of java processes and it seems not to stop. Ever. It uses all 8 GB of RAM on my machine at which point Windows starts killing random processes.
> With 'CONCURRENCY=1' jtreg will spawn only a few java processes and will happily run all the test.
> What is the behavior for 'CONCURRENCY=auto'? Which value is used as default? Maybe it is not a bug its just that OpenJDK tests should be run on a big server machine with lots of RAM?
> Any suggestions or pointers to documentation will be very appreciated.
> -- 
> Regards,
> Tomasz Kowalczewski

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