Re: Blog post: PGO: Optimizing D's virtual calls

[Johan Engelen via Digitalmars-d-announce]

On Wednesday, 13 April 2016 at 11:34:26 UTC, Johan Engelen wrote:

Hi all,
  I've written an article about how I implemented 
profile-guided optimization (PGO)


I packaged LDC v1.0.0 with PGO for OS X:
https://github.com/JohanEngelen/ldc/releases/tag/v1.0.0-beta1-pgo

All your feedback is very welcome :-)

cheers,
  Johan

Re: Blog post: PGO: Optimizing D's virtual calls

[Johan Engelen via Digitalmars-d-announce]

On Wednesday, 20 April 2016 at 22:10:53 UTC, Marco Leise wrote:


7% is quite a bit more than any other option like -cpu=native 
could achieve. If feasible I'd enjoy if ldc2 shipped with a pgo 
configuration option. If you use the compiler in a lot of 
edit/compile cycles it will pay off.


This was the use-case I was optimizing for, and so I will add an 
option to pass a PGO profile to the CMake script :-)
Note that it is a 7% improvement in the D part of LDC. The 
optimizer (LLVM, C++) takes most of the time during compilation 
and so the overall performance increase is smaller.

Re: Blog post: PGO: Optimizing D's virtual calls

[Marco Leise via Digitalmars-d-announce]

Am Fri, 15 Apr 2016 09:04:21 +
schrieb Johan Engelen :

> On Wednesday, 13 April 2016 at 11:34:26 UTC, Johan Engelen wrote:
> > Hi all,
> >   I've written an article about how I implemented 
> > profile-guided optimization (PGO) of virtual calls to direct 
> > calls (a micro-micro-optimization, expected performance gain of 
> > just a few percent if any!).  
> 
> I've updated the article with performance measurements of just 
> the D code of LDC: the improvement with PGO is about 7% !

Compilers are full of logic that makes some code 0.5% faster.
The sum of all these little bits is what makes up an
optimizing compiler and if today you still find an optimization
that's worth 1 or 2% you have a jackpot!

7% is quite a bit more than any other option like -cpu=native
could achieve. If feasible I'd enjoy if ldc2 shipped with a
pgo configuration option. If you use the compiler in a lot of
edit/compile cycles it will pay off.

-- 
Marco

Re: Blog post: PGO: Optimizing D's virtual calls

[Kai Nacke via Digitalmars-d-announce]

On Thursday, 14 April 2016 at 08:20:53 UTC, Johan Engelen wrote:
On Wednesday, 13 April 2016 at 13:08:30 UTC, Andrei 
Alexandrescu wrote:


Noice.

https://twitter.com/D_Programming/status/720236648034877440

https://www.facebook.com/dlang.org/posts/1275322695814742

https://www.reddit.com/r/programming/comments/4elfok/profile_guided_optimization_optimizing_ds_virtual/

http://hackerne.ws


Thanks for posting these!

-Johan


Found this, too:
http://llvmweekly.org/issue/120

Re: Blog post: PGO: Optimizing D's virtual calls

[Johan Engelen via Digitalmars-d-announce]

On Wednesday, 13 April 2016 at 11:34:26 UTC, Johan Engelen wrote:

Hi all,
  I've written an article about how I implemented 
profile-guided optimization (PGO) of virtual calls to direct 
calls (a micro-micro-optimization, expected performance gain of 
just a few percent if any!).


I've updated the article with performance measurements of just 
the D code of LDC: the improvement with PGO is about 7% !

Re: Blog post: PGO: Optimizing D's virtual calls

[Johan Engelen via Digitalmars-d-announce]

On Wednesday, 13 April 2016 at 13:08:30 UTC, Andrei Alexandrescu 
wrote:


Noice.

https://twitter.com/D_Programming/status/720236648034877440

https://www.facebook.com/dlang.org/posts/1275322695814742

https://www.reddit.com/r/programming/comments/4elfok/profile_guided_optimization_optimizing_ds_virtual/

http://hackerne.ws


Thanks for posting these!

-Johan

Re: Blog post: PGO: Optimizing D's virtual calls

[Andrei Alexandrescu via Digitalmars-d-announce]

On 04/13/2016 07:34 AM, Johan Engelen wrote:

Hi all,
   I've written an article about how I implemented profile-guided
optimization (PGO) of virtual calls to direct calls (a
micro-micro-optimization, expected performance gain of just a few
percent if any!). I hope it's interesting for those of you who like to
read about compiler internals.

https://johanengelen.github.io/ldc/2016/04/13/PGO-in-LDC-virtual-calls.html

It's my first programming article, please be gentle with your comments :-)

cheers,
   Johan


Noice.

https://twitter.com/D_Programming/status/720236648034877440

https://www.facebook.com/dlang.org/posts/1275322695814742

https://www.reddit.com/r/programming/comments/4elfok/profile_guided_optimization_optimizing_ds_virtual/

http://hackerne.ws


Andrei