[cfarm-users] GCC135/Power9 performance?

[Jeffrey Walton]

Hi Everyone,

GCC135 is a Power9 machine. Benchmarking on the machine shows
performance is off. For example, here are some numbers for AES in ECB
mode:

GCC112 (Linux, ppc64le, 3.7 GHz, GCC 8.2):
   * 1.12 cpb, 2851 MB/s

GCC119 (AIX, ppc64be, 4.1 GHz, GCC 8.2):
   * 0.54 cpb, 7242 MB/s

GCC135 (Linux, ppc64le, 3.8 GHz, GCC 8.3):
   * 1.94 cpb, 1815 MB/s

All algorithms show a similar slowdown. SHA is so slow I am
considering disabling in-core crypto for SHA and going back to the
integer unit.

What is different about GCC135? Is the Power9 hardware really that slow?

Jeff