In Bug 1206356 comment 10, the designer of the XorShift128+ pseudo-random number generator made a recommendation about how to seed the RNG: "If the initial state contains many zeros, for a few iterations you'll see many zeros. My suggestion is to seed a SplitMix64 generator (http://xorshift.di.unimi.it/splitmix64.c) and to use its first two outputs to seed xorshift128+." We should try this out. (Splitting this off from bug 1239479, so that that can be closed.)
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