Threadripper performance tweaks for pgi fortran?

Accelerated Computing HPC Compilers Legacy PGI Compilers
1

Hi!

I am using a threadripper 1950X to run my simulation code. It is compiled with pgf90 with optimization turned on.

Execution times appear to be on the order of 5 to 10% longer on the 1950X compared to an i7-4770 with the same pgi fortran installed with the same compiler options (basically just -O).

pgf90 -V gives the following output

pgf90 17.10-0 64-bit target on x86-64 Linux -tp piledriver
PGI Compilers and Tools
Copyright (c) 2017, NVIDIA CORPORATION. All rights reserved.

… which identifies the system as piledriver which is not accurate but may still be the best choice (?) for the current pgi compilers?

Since Ryzen CPUs have been out almost a year now … I was wondering if there is a better choice for the -tp option for using pgi fortran for compiling on AMD targets. I was also wondering if there are other options that would give better single thread performance.

Based on available benchmarking data the 1950X should be slightly ahead of the i7-4770 for single thread performance.

2

I see 18.1 has a new cpu type - zen for AMD epyc and ryzen.
So we are beginning to support the newer AMD chips.


dave

3

Do you know when 18.1 (or a version with explicit Zen support) will be released? Only 17.10 is currently available for download.

4

The release 18.1 is imminent, and later than we wanted. Correctness and performance have to both get better. But we are getting there.