The fluctuations in this example have been fixed a few months ago; the issue was the use of multiple streams instead of a single one. Maybe additional CUDA streams have been reintroduced recently?

Best regards,
Karli


On 4/2/20 5:02 AM, Junchao Zhang wrote:
I could not reproduce it locally. Even in the CI, it is random.

--Junchao Zhang


On Wed, Apr 1, 2020 at 7:47 PM Matthew Knepley <knep...@gmail.com <mailto:knep...@gmail.com>> wrote:

    I saw Satish talking about this on the CI Tracker MR.

        Matt

    On Wed, Apr 1, 2020 at 8:36 PM Lisandro Dalcin <dalc...@gmail.com
    <mailto:dalc...@gmail.com>> wrote:

        Well, my request will not fix the problem:
        https://gitlab.com/petsc/petsc/-/jobs/495147366#L5231

        On Thu, 2 Apr 2020 at 03:26, Lisandro Dalcin <dalc...@gmail.com
        <mailto:dalc...@gmail.com>> wrote:

            Can anyone messing with CPUs please update test
            snes_tutorials-ex19_cuda_1 to use -ksp_monitor_short and
            update its output with REPLACE=1 ?

            Please do it in maint, or cherry-pick if already fixed in
            master.

            Regards,

-- Lisandro Dalcin
            ============
            Research Scientist
            Extreme Computing Research Center (ECRC)
            King Abdullah University of Science and Technology (KAUST)
            http://ecrc.kaust.edu.sa/



-- Lisandro Dalcin
        ============
        Research Scientist
        Extreme Computing Research Center (ECRC)
        King Abdullah University of Science and Technology (KAUST)
        http://ecrc.kaust.edu.sa/



-- What most experimenters take for granted before they begin their
    experiments is infinitely more interesting than any results to which
    their experiments lead.
    -- Norbert Wiener

    https://www.cse.buffalo.edu/~knepley/
    <http://www.cse.buffalo.edu/~knepley/>

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