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graph500par: add Domain.cpu_relax on failed CAS #3

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graph500par: add Domain.cpu_relax on failed CAS #3

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5 changes: 4 additions & 1 deletion multicore/graph500par/sparseGraph.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -14,7 +14,10 @@ let rec add_edge (s,e,w) g =
let old = Atomic.get g.(s) in
let new_ = (e,w) :: old in
if Atomic.compare_and_set g.(s) old new_ then ()
else add_edge (s,e,w) g
else begin
Domain.cpu_relax ();
add_edge (s,e,w) g
end

let from s g =
Atomic.get g.(s)
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