evilmucedin

using System;

public class Spaces {
    public static void Main(string[] args) {
        var s = "12345678";
        var r = InjectSpaces(s); // r == "1 2 3 4"
        for (int i = 0; i < 200000000; ++i) {
            r = InjectSpaces(s);
        }
        Console.WriteLine("'{0}' -> '{1}'", s, r);

evilmucedin

// g++ -O3 Spaces.cpp -o Spaces --std=c++14 -march=native -g; time ./Spaces

#include <iostream>
#include <string>

using namespace std;

static string InjectSpaces(const string& s) {
    string result(2*s.length() - 1, ' ');
    const auto length = s.length();

evilmucedin

#include <iostream>
#include <string>

using namespace std;

static string InjectSpaces(const string& s) {
    string result(2*s.length() - 1, ' ');
    char* pResult = (char*)result.data();
    const char* pS = s.data();
    const auto length = s.length();

evilmucedin

03:55 denplusplus@denplusplus-mbp:~/Temp/CSharp$ mcs -unsafe -debug- Spaces.cs; time mono -O=all  ./Spaces.exe
'1234567890' -> '1 2 3 4 5 6 7 8 9 0'

real   	0m12.823s
user   	0m12.609s
sys    	0m0.090s
03:55 denplusplus@denplusplus-mbp:~/Temp/CSharp$ g++ -O3 Spaces.cpp -o Spaces --std=c++14 -march=native -g -DNDEBUG; time ./Spaces
1 2 3 4 5 6 7 8 9 0

real   	0m4.582s

evilmucedin

10:10 denplusplus@denplusplus-mbp:~/Temp/CSharp$ mcs -unsafe -debug- Spaces.cs; time mono -O=all  ./Spaces.exe
Total length: 19999990

real   	0m0.064s
user   	0m0.038s
sys    	0m0.023s
10:10 denplusplus@denplusplus-mbp:~/Temp/CSharp$ g++ -O3 Spaces.cpp -o Spaces --std=c++14 -march=native -g -DNDEBUG; time ./Spaces
19999990

real   	0m0.012s

evilmucedin

// mcs -unsafe -debug- Spaces.cs; time mono -O=all  ./Spaces.exe

using System;
using System.Threading.Tasks;

public class Spaces {
    static unsafe string GetTest(int len) {
        var s = new string(' ', len);
        fixed (char* pS = s) {
            for (int i = 0; i < len; ++i) {

evilmucedin

01:20 denplusplus@denplusplus-desktop:~/Temp/benchmark/nbody$ /usr/bin/g++ -march=native -c -pipe -O3 -fomit-frame-pointer -mfpmath=sse -msse3  nbody.gpp-9.cpp -o nbody.gpp-9.c++.o  &&  /usr/bin/g++ nbody.gpp-9.c++.o -o nbody.gpp-9.gpp_run  && rm nbody.gpp-9.c++.o01:20 denplusplus@denplusplus-desktop:~/Temp/benchmark/nbody$ time ./nbody.gpp-9.gpp_run 50000000
-0.169075164
-0.169059907

real	0m5.807s
user	0m5.805s
sys	0m0.000s
01:20 denplusplus@denplusplus-desktop:~/Temp/benchmark/nbody$ rustc -C opt-level=3 -C target-cpu=core2 -C lto -C codegen-units=1 -C target-feature=+sse2 nbody.rs -o nbody.rust-7.rust_run
01:20 denplusplus@denplusplus-desktop:~/Temp/benchmark/nbody$ time ./nbody.rust-7.rust_run 50000000
-0.169075164