Phoronix article – compilers on threadripper (2018-05-23) – Performance analysis, tools and experiments

Phoronix posted an article comparing compilers on threadripper.

The comparison uses gcc7/gcc8/llvm5/llvm6/llvm7 and AMD AOCC. All benchmarks were compiled with -O3 -march=native.

Overall, there aren’t huge changes between compilers on these benchmarks. Table below summarizes some of phoronix observations in the comparison and mine on behavior of the benchmarks.

Benchmark	Phoronix observations	My observations	Analysis
fftw	AOCC slightly faster on 128 small vector and gcc faster on 1024 vector	Big differences in the benchmark depending on whether it fits in memory/cache.	Analysis
hmmer	llvm5 slightly faster gcc8 slightly slower	On_CPU of 90% with some I/O. IPC of 1.3 with some backend stalls	Analysis
scimark2	llvm7 fastest	Single-threaded. Larger changes than I expected; benchmarks have some backend stalls	Analysis
tscp	AOCC fastest	single-threaded, frontend stalls, IPC of 1.8	Analysis
ttsiod-renderer	GCC generally faster on this benchmark	Equal levels of frontend and backend stalls	Analysis
graphics-magick	GCC generally faster on this benchmark	Five operations, On_CPU 30%	Analysis
himeno	llvm 6 fastest; AOCC slowest	single threaded; linear solver but problem sizes not very large	Analysis
stockfish	llvm slightly faster than gcc	frontend stalls and speculation are largest issues	Analysis
ebizzy	llvm7 fastest, gcc slowest	Testing kernel memory management	Analysis
build-php	AOCC compile times much longer; gcc7 is fastest	On_CPU 82% with some frontend stalls; many small processes	Analysis
c-ray	GCC fastest	Higher IPC, with a few backend stalls	Analysis
aobench	gcc7 fastest and then gcc8	Single threaded with small amount of I/O	Analysis
bullet	gcc8 fastest	Microbenchmark; single threaded and finishes in 5 seconds. Not sure need to devote four charts for this one	Analysis
encode-flac	llvm faster and gcc slower	single-threaded; high ipc with few backend stalls	Analysis
encode-mp3	gcc fastest	single threaded; fairly high IPC with some backend stalls	Analysis
pgbench	gcc fastest	Backend database, On_CPU 50%	Analysis
nginx	gcc8 slightly faster	single threaded driver and database	Analysis
apache	llvm slightly faster	single driver, multiple backends with larger than average system time	Analysis

Performance analysis, tools and experiments

An eclectic collection

Phoronix article – compilers on threadripper (2018-05-23)

Comments

Phoronix article – compilers on threadripper (2018-05-23) — No Comments

Leave a Reply Cancel reply