search

npadmana / DistributedFFT

6 stars 2 forks source link

Compare swan and crystal performance #39

Closed npadmana closed 4 years ago

npadmana commented 4 years ago

@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 commented 4 years ago

Feel free to assign this to me.

ronawho commented 4 years ago

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 commented 4 years ago

I think we can close this.