<div dir="ltr">Hi,<div><br></div><div>Jenkins mostly runs non-pinned mdrun, and under heavy load we probably see more thread migration, and thus such de-sync events. I've only seen the issue on slaves hosted under VM, so I think it's not clear that this is an x86, rather than VM+x86 property.</div><div><br></div><div>Load is heavy lately because we're running multiple master-branch configs while getting the new releng machinery stable. We envisaged a few days that's now been over a week, and barring this unforeseen issue, I think we're more or less happy with things now. Teemu is there value in dealing with more of the releng patches in gerrit before we disable the old master-branch configs?</div><div><br></div><div>Mark</div></div><br><div class="gmail_quote"><div dir="ltr">On Tue, Sep 15, 2015 at 5:17 PM Berk Hess <<a href="mailto:hess@kth.se">hess@kth.se</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
We didn't realize that modern x86 cpus no longer synchronize clocks<br>
between cores. We should get the fix for this merged asap:<br>
<a href="https://gerrit.gromacs.org/#/c/5091/" rel="noreferrer" target="_blank">https://gerrit.gromacs.org/#/c/5091/</a><br>
<br>
Cheers,<br>
<br>
Berk<br>
<br>
On 09/15/2015 05:06 PM, David van der Spoel wrote:<br>
> Hi,<br>
><br>
> my patch stumbled over this issue in Jenkins:<br>
><br>
> Program: gmx mdrun, VERSION 5.2-dev-20150915-ef00eb4-local<br>
> Source file: src/gromacs/timing/wallcycle.cpp (line 398)<br>
> Function: void subtract_cycles(wallcc_t *, int, int)<br>
><br>
> Assertion failed:<br>
> Condition: wcc[ewc_main].c >= wcc[ewc_sub].c<br>
> Subcounter cannot have more ticks than parent<br>
><br>
> For more information and tips for troubleshooting, please check the<br>
> GROMACS<br>
> website at <a href="http://www.gromacs.org/Documentation/Errors" rel="noreferrer" target="_blank">http://www.gromacs.org/Documentation/Errors</a><br>
><br>
> Any clue? Or is this assertion just overly pedantic?<br>
<br>
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