I'm ok with that if it helps us get to the bottom of this once and for all.
I wonder if it would be possible to enable the logging conditionally, so it
only appears in CI? Maybe via a runtime call ("turn logging on now").
- Tony
> On May 23, 2017, at 2:25 AM, Pushkar N Kulkarni <pushkar...@in.ibm.com> wrote:
>
> Hi Tony,
>
> In this context, would it be acceptable if we add (temporarily) some
> diagnostic prints to TestNSURLSession to log information only on failures?
>
> Pushkar N Kulkarni,
> IBM Runtimes
>
> Simplicity is prerequisite for reliability - Edsger W. Dijkstra
>
>
>
> -----Pushkar N Kulkarni/India/IBM wrote: -----
> To: swift-...@swift.org, swift-corelibs-dev@swift.org
> From: Pushkar N Kulkarni/India/IBM
> Date: 05/19/2017 01:24AM
> Subject: Debugging failures seen only in CI
>
> Over the past few months, we've seen random and intermittent failures in the
> URLSession tests in TestFoundation in the CI builds running on Ubuntu 16.04.
> Surprisingly, these failures never occur on PR builds. We've tried to
> reproduce them locally (on matching Ubuntu levels) and fixed locally observed
> issues, assuming those were the issues that broke the CI.
>
> However, the tests continue to intermittently fail in the CI and we seemed to
> have reached a point where we simply aren't able to reproduce these failures
> locally - we tried 2/4/16CPU with 8G/16G memory running Ubuntu 16.04 on bare
> metal. Even if we are able to reproduce, as is in the case of a segfault,
> there's no way to ascertain that the local failures have the same causes (e.g
> backtrace for a segfault) as the ones in the CI.
>
> I have two questions in this context:
> 1. Is there a way to collect failure data from the CI environment - core
> dumps on a crash or thread stacks on a timeout (I don't think XCTest helps) ?
> 2. Is there a way to obtain more information about the environment - is it
> virtualised, # of CPU cores, memory size, CPU/memory available for each
> build, what's the load (CPU/memory utilisation)?
>
> In general, I'd be really helpful to have some suggestions about how to go
> about debugging failures that are being observed ONLY in the CI.
>
> Thanks!
> Pushkar N Kulkarni,
> IBM Runtimes
>
> Simplicity is prerequisite for reliability - Edsger W. Dijkstra
>
>
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