On 4/1/21 9:01 PM, H. S. Teoh wrote:
> 6) (Not described in the thread, but applied later) Reduce GC load even
> further by reusing an array that was being allocated per iteration in
> an inner loop before.
For those who prefer a video description with some accent :) here is how
to appl
On Thursday, 1 April 2021 at 19:38:39 UTC, H. S. Teoh wrote:
On Thu, Apr 01, 2021 at 04:52:17PM +, Nestor via
Digitalmars-d-learn wrote: [...]
[...]
Since the length of the array is already known beforehand, you
could get significant speedups by preallocating the array:
[...]
Firs
On Fri, Apr 02, 2021 at 02:36:21AM +, Jon Degenhardt via
Digitalmars-d-learn wrote:
> On Thursday, 1 April 2021 at 19:55:05 UTC, H. S. Teoh wrote:
[...]
> > It's interesting that whenever a question about D's performance pops
> > up in the forums, people tend to reach for optimization flags.
On Thursday, 1 April 2021 at 19:55:05 UTC, H. S. Teoh wrote:
On Thu, Apr 01, 2021 at 07:25:53PM +, matheus via
Digitalmars-d-learn wrote: [...]
Since this is a "Learn" part of the Foruam, be careful with
"-boundscheck=off".
I mean for this little snippet is OK, but for a other projects
th
On Thu, Apr 01, 2021 at 09:16:09PM +, Imperatorn via Digitalmars-d-learn
wrote:
> On Thursday, 1 April 2021 at 21:13:18 UTC, H. S. Teoh wrote:
[...]
> > Thanks for the very interesting information; so it looks like most
> > of the time spent is actually in copying array elements than
> > anyth
On Thursday, 1 April 2021 at 21:13:18 UTC, H. S. Teoh wrote:
On Thu, Apr 01, 2021 at 01:17:15PM -0700, Ali Çehreli via
Digitalmars-d-learn wrote:
[...]
[...]
[...]
Right, but in a typical program it's unpredictable whether
there will be unused pages after the array.
[...]
[...]
Thanks
On Thu, Apr 01, 2021 at 01:17:15PM -0700, Ali Çehreli via Digitalmars-d-learn
wrote:
> On 4/1/21 12:55 PM, H. S. Teoh wrote:
>
> > - Constructing large arrays by appending 1 element at a time with
> > `~`. Obviously, this requires many array reallocations and the
> > associated copying
>
> And
On 4/1/21 12:55 PM, H. S. Teoh wrote:
> - Constructing large arrays by appending 1 element at a time with `~`.
>Obviously, this requires many array reallocations and the associated
>copying
And that may not be a contributing factor. :) The following program sees
just 15 allocations and
On 01.04.21 21:53, Steven Schveighoffer wrote:
Maybe, but I wasn't responding to that, just your statement not to
recommend -boundscheck=off. In any case, it wouldn't hurt, right?
Right.
On Thu, Apr 01, 2021 at 07:25:53PM +, matheus via Digitalmars-d-learn wrote:
[...]
> Since this is a "Learn" part of the Foruam, be careful with
> "-boundscheck=off".
>
> I mean for this little snippet is OK, but for a other projects this my
> be wrong, and as it says here:
> https://dlang.org
On 4/1/21 3:44 PM, ag0aep6g wrote:
On 01.04.21 21:36, Steven Schveighoffer wrote:
On 4/1/21 3:27 PM, ag0aep6g wrote:
On 01.04.21 21:00, Berni44 wrote:
```
ldc2 -O3 -release -boundscheck=off -flto=full
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto speed.d
```
[...]
Yes, but you can recommend
On 01.04.21 21:36, Steven Schveighoffer wrote:
On 4/1/21 3:27 PM, ag0aep6g wrote:
On 01.04.21 21:00, Berni44 wrote:
```
ldc2 -O3 -release -boundscheck=off -flto=full
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto speed.d
```
[...]
Yes, but you can recommend `-boundscheck=safeonly`, which leave
On 4/1/21 3:27 PM, ag0aep6g wrote:
On 01.04.21 21:00, Berni44 wrote:
```
ldc2 -O3 -release -boundscheck=off -flto=full
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto speed.d
```
Please don't recommend `-boundscheck=off` to newbies. It's not just an
optimization. It breaks @safe. If you want t
On Thu, Apr 01, 2021 at 04:52:17PM +, Nestor via Digitalmars-d-learn wrote:
[...]
> ```
> import std.stdio;
> import std.random;
> import std.datetime.stopwatch : benchmark, StopWatch, AutoStart;
> import std.algorithm;
>
> void main()
> {
> auto sw = StopWatch(AutoStart.no);
> sw.star
On Thursday, 1 April 2021 at 19:00:08 UTC, Berni44 wrote:
Try using ldc2 instead of dmd:
```
ldc2 -O3 -release -boundscheck=off -flto=full
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto speed.d
```
should produce much better results.
Since this is a "Learn" part of the Foruam, be careful wit
On 01.04.21 21:00, Berni44 wrote:
```
ldc2 -O3 -release -boundscheck=off -flto=full
-defaultlib=phobos2-ldc-lto,druntime-ldc-lto speed.d
```
Please don't recommend `-boundscheck=off` to newbies. It's not just an
optimization. It breaks @safe. If you want to do welding without eye
protection
On Thursday, 1 April 2021 at 19:00:08 UTC, Berni44 wrote:
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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 betw
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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.
Try using ldc2 inste
On Thursday, 1 April 2021 at 17:30:15 UTC, Chris Piker wrote:
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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
On Thursday, 1 April 2021 at 17:30:15 UTC, Chris Piker wrote:
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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.
Nice test. I'm new
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
On 4/1/21 10:15 AM, ag0aep6g wrote:
> Move `auto rnd = ...;` out of the loop, and you will get better times.
Doing that reduces the time about 15 fold.
Using Appender reduces it further a tiny bit:
import std.array;
// ...
Appender!(int[]) mylist;
// ...
mylist.data.sort();
Ali
On Thursday, 1 April 2021 at 16:52:17 UTC, Nestor wrote:
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.
[...]
```
for (i
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.
[...]
Could you also post the python code for comparison?
On Thursday, 1 April 2021 at 17:16:06 UTC, Imperatorn wrote:
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.
[...]
Could you also post the python code for comparison?
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
27 matches
Mail list logo
