On Monday, 3 February 2025 at 16:31:10 UTC, H. S. Teoh wrote:
On Mon, Feb 03, 2025 at 04:23:57PM +0000, Paul Backus via
Digitalmars-d-announce wrote:
On Monday, 3 February 2025 at 15:39:35 UTC, Lance Bachmeier
wrote:
> This is useful information. A couple comments:
>
> > Steven Schveighoffer has been preparing DRuntime for the
> > inclusion of the new GC.
>
> I wasn't aware that we'll be getting a new GC. Was there an
> announcement?
There was a DConf talk about it:
https://dconf.org/2024/index.html#steves
Can someone summarize the gist of it? I can't seem to find any
video or transcripts via that link. Don't really have the time
to watch an entire video anyway.
The videos are here:
part 1:
https://www.youtube.com/live/AzezZhvIyS4?si=JH8vtvIbZigbBdcx&t=7467
part 2:
https://www.youtube.com/live/dq7Jhp9cv4w?si=TbOPzVQ2k-sCGuVT&t=8173
TL;DW:
1. We have a lot of improvements possible over the current GC.
2. Get rid of global lock
3. Utilize the system memory in a cache-friendly way
4. Give back memory to the OS more regularly.
5. Lower the cost of using the GC to the point where using malloc
isn't really advantageous
6. Concurrent scanning (planned)
FYI, we have a working version of ldc that includes the new GC as
an option. There are caveats, but you can try it out:
https://github.com/symmetryinvestments/ldc/releases/
To use, pass in `--DRT-gcopt=gc:sdc`, and if you get hangs, you
may want to try `--DRT-gcopt=parallel:0`, as we currently have
some hangs that occur rarely with parallel scanning with multiple
threads.
-Steve
