The summary file and stdout contain lines like...
-total_size 8388608K rsz 1024 thr 1 crg 1 180.45 MB/s 1 x 180.50 = 180.50 MB/s
+dev 30 sz 125829120K rsz 1024K crg 60 thr 120 write 6036.79 [ 100.69, 106.49] read 6720.94 [ 112.64, 220.85]
-The number immediately before the first MB/s is the bandwidth computed by
-measuring total data and elapsed time. The other numbers are a check on
-the bandwidths reported by the individual sgp_dd instances.
+The number immediately after the write and the read word is the bandwidth
+in MiB/s computed by measuring total data and elapsed time. The other numbers
+are the minimal and maximal bandwidths reported by the individual sgp_dd
+instances.
If there are so many threads that sgp_dd is unlikely to be able to allocate
I/O buffers, "ENOMEM" is printed.