Interesting post about how the author with the help of the Go community
has got better performance than C++ version.
"After optimizations, the Go ray tracer was 8.4 % faster than a
functionally equivalent C++ version when rendering a 4.2 MegaPixel image
using a single thread. With multi-threading enabled, the performance gap
widened to 76.2 % on a 8 Core machine."
https://kidoman.com/programming/go-getter.html
El 24/09/13 23:20, Kevin Ballard escribió:
I ran them myself. Incidentally, the Rust version is absurdly slow if I
don't specify an optimization level. Here's what I got:
Clang (-O3): 7.99s real
Go (improved version): 9.68s real
Go (original version): 16.73s real
Rust (--opt-level=3): 13.03s real
(I ran each case 3 times and took the median)
So if we discard the algorithmically-improved Go, then we get
1) C++: 7.99s
2) Rust: 13.02s
3) Go: 16.73s
I'm curious as to what difference using gccgo would make, but I didn't
try (as I don't have GCC).
-Kevin
On Sep 24, 2013, at 2:48 PM, Huon Wilson <dbau...@gmail.com
<mailto:dbau...@gmail.com>> wrote:
On 25/09/13 04:13, Tim Kuehn wrote:
To make it a "fair" fight, I converted the Go and C++ versions to
trace "Rust" instead. These are my results on my Macbook Pro:
=== RUST ===
$ rustc -O bin.rs <http://bin.rs/>
$ time ./bin > rrays.ppm
real0m14.472s
user0m14.102s
sys0m0.365s
=== GO ===
$ go build main.go
$ time ./main > grays.ppm
real0m13.928s
user0m13.914s
sys0m0.020s
=== C++ ===
$ gcc -O crays.cpp
$ time ./a.out > crays.ppm
real0m10.800s
user0m10.794s
sys0m0.005s
=== RANKINGS ===
1) C++ : 10.8s
2) Go : 13.9s
3) Rust : 14.5s
This surprises me a lot (the fact that Go is (1) faster than Rust, (2)
it's only 20% slower than C++, compared to 150+% originally), so I
investigated, and found that the Go is "cheating" with an algorithmic
improvement:
https://github.com/kid0m4n/gorays/commit/249f229ba8c769c38d7dc018acfdf29cc86d6e43
If it's possible, could we re-run the benchmarks with the commit
before that?
Huon
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