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From Robert Metzger <rmetz...@apache.org>
Subject Re: [DISCUSS] Could we Improve tests time and stability?
Date Thu, 16 Mar 2017 16:26:04 GMT
Hi Dmytro,

I'm happy to hear that you are trying to help us improving the test time
situation :)
We have another discussion here on the dev@ list to split the project into
two git repositories to resolve the problem.

I agree that your proposed changes could improve the build times, but I'm
not sure if they are enough to resolve them forever. Some tests just waste
time by waiting on stuff to happen :)
If you want, you can enable travis for your own Flink fork on GitHub, add
your proposed changes to the travis / maven files and see how much they
improve the build time.

On Thu, Mar 16, 2017 at 5:06 PM, Dmytro Shkvyra <Dmytro_Shkvyra@epam.com>

> Hi everyone,
> May be we should remove -XX:-UseGCOverheadLimit option from
> maven-surefire-plugin args and increase -Xmx to 1536m for forks?
> We have about 4 GB RAM and 2 cores at test VMs. I think we can make test
> faster than now. When I tried testing flink-runtime some tests work too
> slow due to GC overhead.
> May be you also faced to problem when Travis build was fallen by timeout?
> Also we can use GC algorithms explicitly for forks execution.
> BTW, we run tests with java 7 and 8 and these versions use by default
> different GC algorithms (GC1 for 8 and Parallel GC for 7). IMHO when we
> have strict limitations of RAM and time of build we should avoid any
> ambiguity.
> In case when some tests can generate very big datasets very fast, paralel
> GC can do not have time to clean up. I do not know how G1 work in this case
> exactly, but may be would better use old good -XX:+UseSerialGC. We have
> only 1 core per fork so we anyway cant use all advantages of G1 and
> ParralelGC. If we use SerialGC (use stop the world) we can be sure that GC
> collect almost all garbage before test continue.
> What do you think about my idea?
> May be someone has another ideas how to improve tests time and stability?
> Dmytro Shkvyra
> Senior Software Engineer
> Office: +380 44 390 5457<tel:+380%2044%20390%205457> x 65346<tel:65346>
>  Cell: +380 50 357 6828<tel:+380%2050%20357%206828>   Email:
> dmytro_shkvyra@epam.com<mailto:dmytro_shkvyra@epam.com>
> Kyiv, Ukraine (GMT+3)   epam.com<http://www.epam.com>
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