Phobos begat madness
David Bennett
davidbennett at bravevision.com
Tue Jun 26 19:47:16 UTC 2018
On Monday, 25 June 2018 at 01:03:03 UTC, David Bennett wrote:
> On Friday, 22 June 2018 at 21:37:07 UTC, Walter Bright wrote:
>>
>> If someone wants to figure out how to build an uncomplicated,
>> straightforward, efficient implementation of text() that we
>> can be proud of, that would be a nice contribution.
>
>
> I will upload the benchmark for `text` tonight.
>
I have made a more complete benchmark [0] so we can see the speed
of each basic type.
Here's the benchmark results for dmd:
|-----------------------------------------------------------------------|
| <convert> .to!(string) | .newTo!(string) |
.writeCharsTo(buf) |
|-----------------------------------------------------------------------|
| ubyte : 1856 ms | 1037 ms |
201 ms |
| ushort : 2336 ms | 1350 ms |
382 ms |
| uint : 3415 ms | 1538 ms |
669 ms |
| ulong : 6171 ms | 2275 ms |
1398 ms |
| byte : 1908 ms | 1044 ms |
227 ms |
| short : 2234 ms | 1364 ms |
406 ms |
| int : 3560 ms | 1603 ms |
629 ms |
| long : 6276 ms | 2219 ms |
1369 ms |
| char : 3013 ms | 1061 ms |
181 ms |
| wchar : 3285 ms | 1043 ms |
242 ms |
| dchar : 3211 ms | 1048 ms |
277 ms |
|-----------------------------------------------------------------------|
|-----------------------------------------------------------------------|
| <concat> text(...) | newText(...) |
.writeCharsTo(buf) |
|-----------------------------------------------------------------------|
| ubyte : 2643 ms | 937 ms |
254 ms |
| ushort : 3237 ms | 1173 ms |
530 ms |
| uint : 5144 ms | 1448 ms |
738 ms |
| ulong : 9854 ms | 2126 ms |
1427 ms |
| byte : 2805 ms | 951 ms |
310 ms |
| short : 3272 ms | 1268 ms |
583 ms |
| int : 5548 ms | 1456 ms |
819 ms |
| long : 10303 ms | 2182 ms |
1488 ms |
| char : 3853 ms | 891 ms |
258 ms |
| wchar : 4151 ms | 940 ms |
263 ms |
| dchar : 3945 ms | 949 ms |
352 ms |
|-----------------------------------------------------------------------|
And ldc2:
|-----------------------------------------------------------------------|
| <convert> .to!(string) | .newTo!(string) |
.writeCharsTo(buf) |
|-----------------------------------------------------------------------|
| ubyte : 1003 ms | 1011 ms |
88 ms |
| ushort : 959 ms | 772 ms |
163 ms |
| uint : 1519 ms | 1237 ms |
382 ms |
| ulong : 2030 ms | 1484 ms |
735 ms |
| byte : 899 ms | 886 ms |
121 ms |
| short : 1115 ms | 1061 ms |
189 ms |
| int : 1267 ms | 1041 ms |
390 ms |
| long : 2030 ms | 1596 ms |
852 ms |
| char : 1958 ms | 755 ms |
28 ms |
| wchar : 1945 ms | 836 ms |
129 ms |
| dchar : 2141 ms | 850 ms |
142 ms |
|-----------------------------------------------------------------------|
|-----------------------------------------------------------------------|
| <concat> text(...) | newText(...) |
.writeCharsTo(buf) |
|-----------------------------------------------------------------------|
| ubyte : 1248 ms | 448 ms |
164 ms |
| ushort : 1676 ms | 612 ms |
290 ms |
| uint : 1491 ms | 732 ms |
445 ms |
| ulong : 2343 ms | 1074 ms |
1095 ms |
| byte : 1288 ms | 506 ms |
143 ms |
| short : 1494 ms | 656 ms |
311 ms |
| int : 1315 ms | 633 ms |
388 ms |
| long : 2540 ms | 1363 ms |
1044 ms |
| char : 2528 ms | 411 ms |
189 ms |
| wchar : 2600 ms | 506 ms |
149 ms |
| dchar : 2697 ms | 452 ms |
167 ms |
|-----------------------------------------------------------------------|
So I think there are quite a lot of savings to be had... actually
I notice that the char version of text(...) is really slow when
it should be quite simple... oh its being converted using to! to
a GC array and the copied in... I'll submit a PR... [1]
That's better (DMD Master + my patch):
|------------------------------|
| <concat> text(...) |
|------------------------------|
| char : 753 ms |
| wchar : 928 ms |
| dchar : 1028 ms |
|------------------------------|
Thanks,
David
[0] https://github.com/complistic-gaff/newconv
[1] https://github.com/dlang/phobos/pull/6615
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