On Saturday, 2 September 2017 at 14:49:30 UTC, thinwybk wrote:
On Friday, 14 July 2017 at 13:29:30 UTC, Joakim wrote:
Yes, D's compile-time regex are still the fastest in the world.
I've been benching it recently for a marketing-oriented blog
post I'm preparing for the official D blog, std.regex beats
out the top C and Rust entries from the benchmarks game on
linux/x64 with a single core:
http://benchmarksgame.alioth.debian.org/u64q/regexredux.html
https://github.com/joakim-noah/regex-bench
D comes in third on Android/ARM, but not far behind,
suggesting it would still be third on that list if run with a
bunch of other languages on mobile. Dmitry thinks it might be
alignment issues, the bane of cross-platform, high-performance
code on ARM, as he hasn't optimized his regex code for ARM.
Do you plan to implement a version for the fastest benchmark
"n-body"
(http://benchmarksgame.alioth.debian.org/u64q/nbody.html) as
well?
No, the goal is to demonstrate the nice, super-speedy regex
engine in the D standard library by using that same benchmark
that Dmitry exhibited years ago, to show D still does really well
at regex. It's not to try and compete across all those
benchmarks, which D used to dominate at one time.
I did wonder how D does on that n-body benchmark now, so I built
and ran the fastest C++ version, #8, on my single-core linux/x64
VPS. Here's the source link for each benchmark, the compiler
version, and the command I used to build it:
C++:
http://benchmarksgame.alioth.debian.org/u64q/program.php?test=nbody&lang=gpp&id=8
clang/llvm 4.0.1
clang -O3 -std=c++11 nbody.cpp -lm -onbody-cpp
D:
https://bitbucket.org/qznc/d-shootout/raw/898f7f3b3c5d55680229113e973ef95ece6f711a/progs/nbody/nbody.d
ldc 1.4 beta1, llvm 4.0.1
ldc2 -O3 nbody.d
The D version averages 2.5 seconds, the C++ version 6 seconds,
which means D would likely still be at the top of that n-body
ranking today.
Adding D to the performance comparison of
https://github.com/derekmolloy/exploringBB/tree/master/chp05/performance (companion code to the book "Exploring BeagleBone - Tools and Techniques For Building With Embedded Linux") could be good promotion in the embedded domain (where performance, Linux compatibility and code maintainability matters).
Hmm, I have not used an ARM board in years, my Pandaboard is in
storage far away. By including Android/ARM in the regex blog
post, hopefully some people will realize D is a good option there.
