[CRIU] [PATCH] zdtm: add a dummy action-script

[Andrew Vagin]

On Thu, Aug 07, 2014 at 05:14:40PM +0400, Pavel Emelyanov wrote:
> On 08/07/2014 04:16 PM, Christopher Covington wrote:
> > On 08/07/2014 03:06 AM, Pavel Emelyanov wrote:
> >> On 08/06/2014 05:05 PM, Andrey Vagin wrote:
> >>> Just to be sure that it affects nothing
> >>
> >> This would affect the full tests run time significantly.
> > 
> > What if it went in at the same time as an optimization so that overall runtime
> > stayed constant or dropped?
> 
> Hardly. The sigaction restore saves us 64 syscalls per-task for tests that have
> more than one of them (quite a few), while each --action-script results in 3-4
> system() calls performed :)
> 
> > Speaking of test run-time, it appears to me that zdtm.sh is currently pretty
> > single threaded. Adding parallelization to the test harness may provide a
> > useful speedup on quad code and greater systems (maybe the kind of speed up
> > that could hide the slowdown of always running a script).
> 
> Andrew knows some way of launching ns/ tests in parallel. Andrey?

make -C test -j 4 zdtm_ns

> 
> >> Can we add some randomization and feed the fake script into arbitrary 10%
> >> of the tests?
> > 
> > Are the current tests generally deterministic? 
> 
> Yup.
> 
> > If so I think it'd be good to
> > keep them so, for repeatably results and easy debugging. Probabilistic testing
> > or fuzzing sounds like a great idea, but perhaps it'd be best organized as a
> > separate suite from deterministic tests.
> 
> Yes, I agree. Maybe we can then pick some tests and add --action-scrip true
> into the .opts file?
> 
> Thanks,
> Pavel
> 
>