[ovs-dev] [PATCH 1/7] ovsdb raft: Sync commit index to followers without delay.

[Ben Pfaff]

On Fri, Apr 12, 2019 at 10:13:23AM -0700, Han Zhou wrote:
> On Fri, Apr 12, 2019 at 9:52 AM Ben Pfaff <blp at ovn.org> wrote:
> >
> > Thanks for the series.  I'd like to commit it.
> >
> > The problems with the resources needed by the tests are still there.
> > When I run with TESTSUITEFLAGS=-j10 and I have swap enabled on my
> > system, the system loses interactive response for a couple of minutes as
> > it thrashes.  When I run with TESTSUITEFLAGS=-j10 and I don't have swap
> > enabled on my system, the OOM killer takes out Firefox.  (I have 32 GB
> > RAM.)  When I run with -j1 (the default), the testsuite takes much
> > longer.
> >
> > Here is an idea: we can put the raft tests in a new testsuite.  We
> > already have a number of them.  It could be invoked as "make
> > check-raft", for example.  Then this testsuite could be run with lower
> > parallelism since the individual tests are so resource heavy.
> >
> > What do you think?
> >
> Hi Ben, I didn't know it was *that* slow on your laptop. It looks ok on
> mine even it is just a VM (with 4 virtual cores, 8GB mem) on my laptop,
> system responsing very well. However I agree that if you encounters such
> slowness, it may happen to others, too. I will be happy to make the change
> as you suggested. Could you point out the already existed heavy test cases
> that are in separate testsuite? I want to make sure I refer to the right
> examples before making the change. Thanks a lot!

I am puzzled why we see such different results, but I don't think that
my system is anything unusual, so I do think that others will see
behavior similar to what I see.

I think that it would make sense to put everything in ovsdb-cluster.at
in the new "check-raft" ("check-cluster"? whichever you prefer).  I
think those are the only tests that cause trouble for me.