Compare swan and crystal performance

[npadmana]

@npadmana has been seeing noticeably slower performance on swan than the benchmarks @ronawho sees on crystal.

Not urgent, but would be good to track down the differences.

[ronawho]

Feel free to assign this to me.

[ronawho]

I see the same performance differences for the UPC and MPI versions too, so I would chalk this up to machine differences. We were expecting Swan to be faster because it's 44-core 2.2 GHz Broadwell chips vs 36-core 2.1 GHz Broadwell chips on Crystal. I don't understand the difference yet, but it's consistent across reference versions, so I don't think this is anything to be concerned about for Chapel.

Below are Chapel/UPC times for 32 nodes for size D/E:

32 node results for size D:

Config	Swan	Crystal
Chapel	11.61 s	10.39 s
UPC	13.79 s	11.97 s

32 node results for size E:

Config	Swan	Crystal
Chapel	98.68 s	88.04 s
UPC	115.67 s	104.71 s

[ronawho]

I think we can close this.