On Wednesday, 2 December 2020 at 06:31:49 UTC, H. S. Teoh wrote:
On Tue, Dec 01, 2020 at 10:49:55PM +0000, ddcovery via
Digitalmars-d-learn wrote:
Yesterday I really shocked when, comparing one algorithm
written in javascript and the equivalent in D, javascript
performed better!!!
[...]
With 1 million Double numbers (generated randomly):
Javascript (node 12): 1507 ms
DMD: 2166 ms
With 6 million Double numbers
Javascript (node 12): 10776 ms
DMD: 15243 ms
Yeah, when it comes to performance-related things, don't bother
with DMD. Its optimizer is known to have limitations, and IME
consistently produces code that underperforms LDC-generated
code by about 20-30%, sometimes even as high as 40%.
For performance comparisons, always use GDC/LDC.
T
After applying adecuate parametrization (thanks to Max Haughton
for the tips), LDC generated code is running almost 3 times
faster than DMD one!!!
