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    SubjectRe: [PATCH v2 2/2] tools/memory-model: Make ppo a subrelation of po
    On Sat, Jan 28, 2023 at 11:14:17PM +0100, Andrea Parri wrote:
    > > Evidently the plain-coherence check rules out x=1 at the
    > > end, because when I relax that check, x=1 becomes a possible result.
    > > Furthermore, the graphical output confirms that this execution has a
    > > ww-incoh edge from Wx=2 to Wx=1. But there is no ww-vis edge from Wx=1
    > > to Wx=2! How can this be possible? It seems like a bug in herd7.
    >
    > By default, herd7 performs some edges removal when generating the
    > graphical outputs. The option -showraw can be useful to increase
    > the "verbosity", for example,
    >
    > [with "exists (x=2)", output in /tmp/T.dot]

    This was meant to be "exists (x=1)".

    Andrea


    > $ herd7 -conf linux-kernel.cfg T.litmus -show prop -o /tmp -skipchecks plain-coherence -doshow ww-vis -showraw ww-vis
    >
    >
    > > Furthermore, the execution with x=2 at the end doesn't have either a
    > > ww-vis or a ww-nonrace edge betwen Wx=1 and Wx=2. So why isn't there a
    > > ww-race edge?
    >
    > And similarly
    >
    > [with "exists (x=2)"]
    > $ herd7 -conf linux-kernel.cfg T.litmus -show prop -o /tmp -doshow ww-vis,ww-nonrace -showraw ww-vis,ww-nonrace
    >
    > Andrea

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