...Performance
This research was supported by NSF grant CCR-9510173, an NSF CISE Institutional Infrastructure Grant No. CDA-9401142, and an equipment grant from Digital Equipment Corporation's External Research Program. Wagner Meira Jr. is supported by CNPq-Brazil, Grant 200.862/93-6
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...[5].
We have implementations that exploit a global clock on the IBM SP2 and the SGI Challenge. Any implementation based on logical clocks must also record a local timestamp on each event, so that the duration of local events can be calculated accurately.
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...time. 
This pair-wise approach extends easily to barriers, which we analyze as a set of pair-wise synchronization operations between each waiting processor and the last processor to enter the barrier.
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Wagner Meira
Thu Jan 9 14:27:55 EST 1997