On Wednesday, 11 November 2015 at 16:02:07 UTC, H. S. Teoh wrote:
If performance is a problem, my first reaction would be to try
GDC or LDC. While there have been recent improvements in DMD
code generation quality, it still has a ways to go to catch
with GDC/LDC's optimizer.
T
My computer seems to agree (note that I did those a bunch of time
with
intermediate rounds to heat the cache, these numbers are only to
give
a rough idea):
$time rdmd --compiler=ldc test.d
|row1.1|row1.2 |row1.3 |
|row2.1|row2.2 |row2.3 |
|row3.1|row3.2 |row3.3 |
|row4.1|row4.2 |row4.3 |
|row5.1|row5.2 |row5.3 |
rdmd --compiler=ldc test.d 6.07s user 0.10s system 99% cpu 6.177
total
$time rdmd --compiler=dmd test.d
|row1.1|row1.2 |row1.3 |
|row2.1|row2.2 |row2.3 |
|row3.1|row3.2 |row3.3 |
|row4.1|row4.2 |row4.3 |
|row5.1|row5.2 |row5.3 |
rdmd --compiler=dmd test.d 21.21s user 0.09s system 97% cpu
21.919 total
$time ./test.pl
|row1.1|row1.2 |row1.3 |
|row2.1|row2.2 |row2.3 |
|row3.1|row3.2 |row3.3 |
|row4.1|row4.2 |row4.3 |
|row5.1|row5.2 |row5.3 |
./test.pl 13.71s user 0.00s system 99% cpu 13.715 total
With optimization on it is better but still not enough for dmd:
$time rdmd --compiler=ldc -inline -release -O test.d
|row1.1|row1.2 |row1.3 |
|row2.1|row2.2 |row2.3 |
|row3.1|row3.2 |row3.3 |
|row4.1|row4.2 |row4.3 |
|row5.1|row5.2 |row5.3 |
rdmd --compiler=ldc -inline -release -O test.d 4.99s user 0.09s
system 98% cpu 5.170 total
$time rdmd --compiler=dmd -inline -release -O test.d
|row1.1|row1.2 |row1.3 |
|row2.1|row2.2 |row2.3 |
|row3.1|row3.2 |row3.3 |
|row4.1|row4.2 |row4.3 |
|row5.1|row5.2 |row5.3 |
rdmd --compiler=dmd -inline -release -O test.d 12.67s user 0.06s
system 99% cpu 12.736 total
