Re: LDC 1.25.0
On Tue, Feb 23, 2021 at 07:32:13PM +, kinke via Digitalmars-d-announce wrote: > On Tuesday, 23 February 2021 at 18:19:09 UTC, H. S. Teoh wrote: > > Tested this on one of my projects yesterday. For -O3, it reduced > > compile time by about ~26%. For -O, it reduced compile time by > > about 24%. Not as much as I'd hoped, but still pretty big > > reductions. > > Thx for some numbers. [Note that -O == -O3 == -O4 == -O5, they are all > the same (at least for now), contrary to what you might read > somewhere.] A reduction by 25%, i.e., a 1.33x speed-up, for code that > is guaranteed to be at least as fast as before (higher cross-module > inlining potential) isn't too bad, aye? :) Yeah actually it's pretty good. It's only that my expectations were a bit high when you reported 50+% reductions in compile times. :-) > > For non-optimized builds, it reduced compile times by only 1-2% > > (pretty insignificant). > > I find it rather interesting that it isn't any slower. Compiling debug > Phobos all-at-once took 67% longer on my box (and increased the static > lib size by 76%). Without -O, I've only seen some improvements with > `-unittest`. [...] Interesting indeed. I just did a quick test with -unittest, and got these numbers: -unittest: 15.9 sec -unittest -linkonce-templates: 22.3 sec -unittest -O: 54.4 sec -unittest -O -linkonce-templates: 40.7 sec Apparently with -unittest it *does* run slower without -O. But with -O, it does run faster. T -- It won't be covered in the book. The source code has to be useful for something, after all. -- Larry Wall
Re: LDC 1.25.0
On Tuesday, 23 February 2021 at 18:19:09 UTC, H. S. Teoh wrote: Tested this on one of my projects yesterday. For -O3, it reduced compile time by about ~26%. For -O, it reduced compile time by about 24%. Not as much as I'd hoped, but still pretty big reductions. Thx for some numbers. [Note that -O == -O3 == -O4 == -O5, they are all the same (at least for now), contrary to what you might read somewhere.] A reduction by 25%, i.e., a 1.33x speed-up, for code that is guaranteed to be at least as fast as before (higher cross-module inlining potential) isn't too bad, aye? :) For non-optimized builds, it reduced compile times by only 1-2% (pretty insignificant). I find it rather interesting that it isn't any slower. Compiling debug Phobos all-at-once took 67% longer on my box (and increased the static lib size by 76%). Without -O, I've only seen some improvements with `-unittest`. Some more numbers on my box: https://github.com/ldc-developers/ldc/pull/3600#issuecomment-729116599 https://github.com/ldc-developers/ldc/pull/3422#issuecomment-661386233
Re: LDC 1.25.0
On Sun, Feb 21, 2021 at 06:26:38PM +, kinke via Digitalmars-d-announce wrote: > Glad to announce LDC 1.25 - some highlights: > > - Based on D 2.095.1. Awesome!! Thanks to everyone in the LDC team who made this release possible. [...] > - New experimental template emission scheme for -linkonce-templates. > This option can significantly accelerate compilation times for > optimized builds (e.g., 56% faster on my box when compiling the > optimized Phobos unittests). [...] Tested this on one of my projects yesterday. For -O3, it reduced compile time by about ~26%. For -O, it reduced compile time by about 24%. Not as much as I'd hoped, but still pretty big reductions. For non-optimized builds, it reduced compile times by only 1-2% (pretty insignificant). T -- The easy way is the wrong way, and the hard way is the stupid way. Pick one.
Talk before Compiler Research Group at IRIS-HEP Princeton on SIL-cling
https://youtu.be/7teqrCNzrD8 https://t.co/2iAWdO9cXA Alexandru Militaru speaks to Compiler Research Group, IRIS-HEP at Princeton about his work at @SymmetryInvest using CERN's cling to compile and call C++ from our internal domain specific language, SIL. #dlang #cling
