Re: How to parallelize a for-loop

[adnan]

I agree, however it would perform better if there were too many arguments 
(which is an edge case). Nonetheless I would love to know how to harness the 
multicore capability inside a for loop in Nim.

For reference here's the program in D:
    
    
    import std.stdio : writeln;
    import std.algorithm : splitter;
    import std.range : chain;
    import std.path : dirSeparator, pathSeparator;
    import std.process : environment;
    import std.file : exists;
    
    pragma(inline, true) public void which(in ref string bin) {
        foreach (path; environment.get("PATH", "").splitter(pathSeparator)) {
            auto probe = chain(path, dirSeparator, bin);
            if (probe.exists()) {
                writeln(probe);
                break;
            }
        }
    
    }
    
    void main(in string[] args) {
        if (args.length == 2) {
            which(args[1]);
        }
        else {
            version (par) {
                import std.parallelism : parallel;
                
                foreach (arg; args.parallel())
                    which(arg);
            }
            version (sng) {
                foreach (arg; args)
                    which(arg);
            }
        }
    }
    
    
    
    Run
    
    
    $  gdc source/app.d -fversion=par -O3
    $ time ./a.out $(ls /usr/bin)
    // ...
    0.040s
    
    $ gdc source/app.d -fversion=sng -O3
    // ...
    0.084s
    $ time ./a.out $(ls /usr/bin)
    // ...
    
    
    
    Run