[JAVA] I also tried WebAssembly with Nim and C

http://qiita.com/akira_/items/55cf1f5911b14e265c6f Inspired by this article, I wrote the Nim version and the C version.

First result

The result of fibonacci (45)

environment

CPU: Intel Core i7-6700
RAM: 8GB x2
WebBrowser: Google Chrome 57.0.2987.98 (64-bit)

As for the result, please note that the result will change depending on the execution environment and each execution, just by pasting the one that was executed once.

Source code

# Nim
import os
import times
import strutils

proc fibonacci*(n: int64): int64 =
  if n <= 1'i64:
    1'i64
  else:
    fibonacci(n - 1'i64) + fibonacci(n - 2'i64)

proc main() =
  let args = commandLineparams()
  let n = args[0].parseInt()
  echo "fibonacci($#) = $#" % [$n, $fibonacci(n.int64)]

main()

// C
#include <stdint.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>

int64_t fibonacci(int64_t n) {
    if (n <= 1) {
        return 1;
    } else {
        return fibonacci(n - 1) + fibonacci(n - 2);
    }
}

int main(int argc, char** argv) {
    int n = atoi(argv[1]);
    printf("fibonacci(%d) = %" PRId64 "\n", n, fibonacci(n));
    return 0;
}

procedure

In the above article, it seems that it was built using the Docker image, but I used the one installed on Xubuntu on the VM using emsdk as the build environment.

I will omit the installation of compilers for various languages such as Rust and Nim.

Install Emscripten

http://kripken.github.io/emscripten-site/docs/getting_started/downloads.html Download emsdk from, unzip it, and put it in your PATH.

After passing through PATH

$ emsdk update
$ emsdk install sdk-incoming-64bit
$ emsdk activate sdk-incoming-64bit

You can install and enable Emscripten itself with.

** Addendum ** After this

$ source emsdk-portable/emsdk_env.sh

I forgot to write what I need, so I will add it. I think it is good to write it in ~ / .profile etc. ** Addendum to here **

Regarding Emscripten, if it is sdk-incoming-64bit, it seems that the version flag of WebAssembly is properly 1.0. (As of March 14, 2017)

The caveat here is that not only Emscripten but also LLVM and Clang builds run, which is time consuming and consumes a lot of memory. Regarding memory, let's deal with it by preparing swap or preparing a large amount in the first place. (I dealt with it by allocating 10GB of memory to the VM)

All you have to do is run the compiler for your language.

# C
$ emcc -O3 -s WASM=1 -o fib-c.js fibonacci.c
# Rust
$ rustc -O --target=wasm32-unknown-emscripten -o fib-rust.js fibonacci.rs
# Nim
$ nim c -d:release -d:emscripten -o:fib-nim.js fibonacci.nim

For Nim, put the following nim.cfg in the same directory as the source.

@if emscripten:
  cc = clang
  clang.exe = "emcc"
  clang.linkerexe = "emcc"
  clang.options.linker = ""
  cpu = "i386"
  warning[GcMem]= off
  passC = "-s WASM=1"
  passL = "-s WASM=1"
@end

Impressions

--It's hard because the build of Emscripten is just heavy. --I feel like I want a choice of to Wasm compiler other than Emscripten ――For the time being, if you use WebAssembly, it will work fairly fast, probably because of the modern compiler. ――It takes time to compile using Emscripten for the first time, but after the second time, it compiles within 5 seconds at the longest. ――In particular, Nim has incremental compilation, and Rust is also under development, so even large programs will not be a problem.

Summary

I've benchmarked four languages: JavaScript, C, Rust, and Nim, but this article may be something I wrote to get Nim interested. Currently, it seems that the only language that WebAssembly can do is C / C ++ / Rust, but I would appreciate it if you could know that Nim can also do it. (I'm not sure if GC is working properly ...) Even with Nim, you can manipulate the DOM by using jsbind.

In particular, Nim has GC, so I think it's easier to write than C / C ++ / Rust, so I'd like it to be an option as a language that can be easily accelerated with WebAssembly.

Finally

We have created a site where you can benchmark WebAssembly so that you can easily try it with your browser.

https://snowlt23.github.io/wasm-bench-site/

It's a rough construction, but I hope you can feel the atmosphere by moving it for the time being.

As a caveat, I'm benchmarking from Wasm's perspective because it's a sloppy build, and that's why it's slower than JavaScript when N is small. We recommend about 40 <= N <= 46.

I'm a person who gets sick every time I write JavaScript, so I hope the day will come when it will become commonplace for various languages to work on the Web.