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  • $\begingroup$ I still do not get why we get ParallelEvaluate[z] (* {4,4,4,4} *) after the Clear[z] and still ValueQ[z] is false. Which mechanism makes the 4 know to ParallelEvaluate[z] after ParallelEvaluate[Clear[z]] if not DistributeDefinitions? $\endgroup$ Commented May 25, 2016 at 10:35
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    $\begingroup$ @Eisbär. After ParallelEvaluate[Clear[z]], the value of z in the subkernels is cleared, but in the main kernel the valueof z is still 4. Therefore, ParallelEvaluate[z] (which now does not redistribute the definition of z to the subkernels) returns the list {z,z,z,z} in the main kernel. But in the main kernel this list further evaluates to {4,4,4,4}. $\endgroup$ Commented Jun 5, 2016 at 6:50
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    $\begingroup$ Thats a tricky one, as it is not actually returning the true value as given by the parallel kernel but an interpretation of that by the master kernel. I have to rember that one. Thank you for elaborating. $\endgroup$ Commented Jun 7, 2016 at 6:47