On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
I am a python programmer and I am enjoying Dlang and learning
some programming insights on the way, thank everyone.
I have no formal education and also program JS and PHP.
Watching a video where a guy programs some simple code in
Python and the same code in Go and compares speed I thought
that could be some nice exercise for my learning path and
successfully ported code to Dlang (hope so)
I was hoping to beat my dear Python and get similar results to
Go, but that is not the case neither using rdmd nor running the
executable generated by dmd. I am getting values between
350-380 ms, and 81ms in Python.
1- I am doing something wrong in my code?
2- Do I have wrong expectations about Dlang?
Thanks in advance.
This is the video: https://www.youtube.com/watch?v=1Sban1F45jQ
This is my D code:
```
import std.stdio;
import std.random;
import std.datetime.stopwatch : benchmark, StopWatch, AutoStart;
import std.algorithm;
void main()
{
auto sw = StopWatch(AutoStart.no);
sw.start();
int[] mylist;
for (int number = 0; number < 100000; ++number)
{
auto rnd = Random(unpredictableSeed);
auto n = uniform(0, 100, rnd);
mylist ~= n;
}
mylist.sort();
sw.stop();
long msecs = sw.peek.total!"msecs";
writefln("%s", msecs);
}
```
```
import time
import random
start = time.time()
mylist = []
for _ in range(100000):
mylist.append(random.randint(0,100))
mylist.sort()
end = time.time()
print(f"{(end-start)*1000}ms")
```
Now when I actually read what you wrote I tested moving auto rnd
= Random(unpredictableSeed) outside the loop and got 481 ms for
the first version vs 34 ms for the other.
---
auto sw = StopWatch(AutoStart.no);
sw.start();
int[] mylist;
auto rnd = Random(unpredictableSeed);
for (int number = 0; number < 100000; ++number)
{
auto n = uniform(0, 100, rnd);
mylist ~= n;
}
mylist.sort();
sw.stop();
long msecs = sw.peek.total!"msecs";
writefln("%s", msecs);
---
Also, one thing you could do is to parallelize for even faster
performance. I can show you how to do that later if you want to.
