On Tuesday, 24 October 2017 at 14:17:32 UTC, Dmitry Olshansky wrote:
On Tuesday, 24 October 2017 at 13:29:12 UTC, Mike Parker wrote:
On Tuesday, 24 October 2017 at 13:19:15 UTC, Dmitry Olshansky wrote:
What is dcache?

It's a patch for dmd that enables a *persistent* shared-memory hash-map, protected by a spin-lock from races. Dmd processes with -cache flag would detect the following pattern:

Blog post or it didn't happen!

Let us at least try it outside of toy examples.

If anybody has std.regex.ctRegex usage I'd be curious to see:

1. Build time w/o -cache=mmap
2. First build time w -cache=mmap
3. Subsequent build times w -cache=mmap

P.S. It's a crude PoC. I think we can do better.

Another caveat: Posix-only for now.

Did a few cleanups and widened the scope a bit.

So here is what happens in my benchmark for std.regex.

-O -inline -release:
88s --> 80s,  memory use ~700Mb -> ~400Mb

19s -> 12.8s

Experimental std.regex.v2 is sadly broken by a recent change to array ops. It would be very interesting to check as it eats up to 17Gb of RAM.

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