• Etranger (48/48) Aug 01 2017 Hi all,
• Etranger (66/67) Aug 02 2017 Forgot to put an example output and it seems we cannot edit our

Etranger <nonvalidemail nowhere.com> writes:

Hi all,

I don't know if it is the right place to post that but I wrote a 
little benchmarking lib [1] in order to learn the D programming 
language, and also because I was learning Rust at the same time 
and wanted to be able to compare their performances.

The lib is in part a translation of the Rust benchmarking 
functionality (which is integrated into the rust compiler) to D.

Example:

import std.stdio;
import std.json;

import simplebench;

immutable N = 25;
// Functions to bench
ulong fib_rec(immutable int n){
  ...
}
// Function to bench
ulong fib_for_loop(immutable int n) {
     ...
}

// The proper test function
void test_fib_rec(ref Bencher bencher){
   int n=N; // Init variables, allocate memory ...
   bencher.iter((){
       return fib_rec(n); // The real code to bench
   });
}

void main()
{
   // The test function have to be static
   static void test_fib_for_loop(ref Bencher bencher){
     int n=N;
     bencher.iter((){
         return fib_for_loop(n);
     });
   }

   assert(fib_for_loop(N) == fib_rec(N));
   // Run the benchmarks
   auto br = BenchMain!(test_fib_rec, test_fib_for_loop);
   // Convert the results to JSON
   writeln(br.toJSON.toPrettyString);

}

I hesitated to post it as I'm still learning the language but who 
knows maybe it can be useful for someone (And maybe someone will 
give me feedback for improvement).

[1] https://github.com/BigEpsilon/simpleBench

PS: I know there is a benchmark function in the standard lib but 
I found it quite limited.

Etranger <nonvalidemail nowhere.com> writes:

On Tuesday, 1 August 2017 at 09:02:17 UTC, Etranger wrote:
 Hi all,

Forgot to put an example output and it seems we cannot edit our 
previous messages.
So here is the output of the example in my previous post:

------------------------------------------------------------------------------------------------------------------------------------
            Benchmark name |                      Time/iter |      
       Best |           Worst |           Total |      Iterations |
------------------------------------------------------------------------------------------------------------------------------------
              test_fib_rec |     274.971 us (+/- 13.956 us) |      
271.525 us |      285.482 us |     3.73613 sec |             271 |
         test_fib_for_loop |                4 ns (+/- 0 ns) |      
       4 ns |            4 ns |    276.258 msec |         1169755 |
------------------------------------------------------------------------------------------------------------------------------------
{
     "BenchmarksResults": [
         {
             "mb_s": 0,
             "name": "test_fib_rec",
             "ns_iter_summ": {
                 "iqr": 4803.25,
                 "max": 285482.400000000023,
                 "mean": 276296.097999999998,
                 "median": 274971.5,
                 "median_abs_dev": 3091.221,
                 "median_abs_dev_pct": 1.12419687131211776,
                 "min": 271525.900000000023,
                 "quartiles": [
                     273139.75,
                     274971.5,
                     277943
                 ],
                 "std_dev": 4389.8878894842901,
                 "std_dev_pct": 1.5888345587436743,
                 "sum": 13814804.9000000004,
                 "var": 19271115.6822408326
             },
             "total_iterations": 271,
             "total_ns": 3736127769
         },
         {
             "mb_s": 0,
             "name": "test_fib_for_loop",
             "ns_iter_summ": {
                 "iqr": 0,
                 "max": 4,
                 "mean": 4,
                 "median": 4,
                 "median_abs_dev": 0,
                 "median_abs_dev_pct": 0,
                 "min": 4,
                 "quartiles": [
                     4,
                     4,
                     4
                 ],
                 "std_dev": 0,
                 "std_dev_pct": 0,
                 "sum": 200,
                 "var": 0
             },
             "total_iterations": 1169755,
             "total_ns": 276258388
         }
     ]
}

which shows better in a terminal :/