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https://issues.apache.org/jira/browse/DISPATCH-1739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17171399#comment-17171399
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ASF GitHub Bot commented on DISPATCH-1739:
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gemmellr commented on pull request #809:
URL: https://github.com/apache/qpid-dispatch/pull/809#issuecomment-669105411
The test times look a fair bit longer in the latest version, presumably
thats as much/more due to removing -j2? Did you also try doing that leaving it
with 4 shards first, to see the difference each change made? Maybe using 4 (or
more :o) would be better if not using the -j2.
(I dislike the complexity sharding adds, but if having it then it should at
least result in much faster runs to offset that. Right now its probbly barely
halving the test time, so the overall job still looks well over half the time
of a basic singular run)
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> Use GitHub Actions w/ sharding and bubblewrap for some fast CI
> --------------------------------------------------------------
>
> Key: DISPATCH-1739
> URL: https://issues.apache.org/jira/browse/DISPATCH-1739
> Project: Qpid Dispatch
> Issue Type: Improvement
> Components: Tests
> Affects Versions: 1.12.0
> Reporter: Jiri Daněk
> Assignee: Jiri Daněk
> Priority: Major
> Fix For: 1.13.0
>
>
> GitHub Actions is a task runner associated with a GitHub project. It is
> conceptually similar to Travis, except that it has some extra features, and
> the waits for computational resources are much shorter (currently).
> Sharding is a technique to speed up the execution of tests. Instead of
> running the tests on one machine one after another, copy the build directory
> over to multiple machines, say two, and have the first execute the
> odd-numbered and the second one the even-numbered tests. With luck (if
> copying the build directory is relatively fast, and the tests all take
> approximately the same time), this will cut the execution time in half.
> Bubblewrap (https://github.com/containers/bubblewrap) is a sandboxing tool
> available on Ubuntu and other systems. It is similar to systemd-nspawn except
> it does not require sudo or user namespace support in the kernel. It is
> similar to docker, except it does not use images, instead it selectively
> mounts directories from the host. Bubblewrap can create an isolated network
> namespace, which allows running multiple tests at the same time, each in its
> own bubblewrap sandbox, and they don't clash on ports. With bubblewrap,
> running {{ctest -j4}} is safe.
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