On Sunday, 10 April 2016 at 20:18:28 UTC, Lewis wrote:
> On Thursday, 7 April 2016 at 07:44:48 UTC, Nordlöw wrote:
>> On Tuesday, 5 April 2016 at 22:43:05 UTC, Martin Nowak wrote:
>>> Glad to announce D 2.071.0.
>>
>> I read somewhere recently about performance regressions in DMD. Were these related the import and module fixes? Were they fixed? Do they depend on any dmd switches?
>>
>> Thanks anyway!
>
> I just updated one of my projects from 2.069.0 to 2.071.0, and saw the build time jump from ~1.7s to ~2.5s. Take this single informal data point with a huge grain of salt obviously, but I am also curious about the details of this. DMD's speed is one of D's selling points to me, and I might roll back until performance improves if there isn't a straightforward fix.
>
> Agreed though, otherwise a great release. Thanks for everyone's hard work!


Late to the party, but congratulations and great work on another impressive release! Thanks to everyone involved!


Just wanted to report a very large decrease in build performance.
Compare a debug build on Ubuntu 16.04 64-bit with ld.gold.

with 2.070.2:
real	0m9.775s
user	0m9.036s
sys	0m0.700s

with 2.071.0:
real	0m45.011s
user	0m41.760s
sys	0m3.144s


Since this release is not critical for us, despite including many great changes, we will also stick to DMD 2.070.2 and hope for a fix in a future release, if at all possible.

On Monday, 2 May 2016 at 16:47:13 UTC, Márcio Martins wrote:
> with 2.070.2:
> real	0m9.775s
> user	0m9.036s
> sys	0m0.700s
>
> with 2.071.0:
> real	0m45.011s
> user	0m41.760s
> sys	0m3.144s

Wow, that's pretty awful.

Have you tried using digger to find out what caused the slow down?

On Monday, 2 May 2016 at 17:02:50 UTC, Jack Stouffer wrote:
> On Monday, 2 May 2016 at 16:47:13 UTC, Márcio Martins wrote:
>> with 2.070.2:
>> real	0m9.775s
>> user	0m9.036s
>> sys	0m0.700s
>>
>> with 2.071.0:
>> real	0m45.011s
>> user	0m41.760s
>> sys	0m3.144s
>
> Wow, that's pretty awful.
>
> Have you tried using digger to find out what caused the slow down?

Will give it a go later :)

On Monday, 2 May 2016 at 16:47:13 UTC, Márcio Martins wrote:
> Since this release is not critical for us, despite including many great changes, we will also stick to DMD 2.070.2 and hope for a fix in a future release, if at all possible.

There is an issue by now https://issues.dlang.org/show_bug.cgi?id=15988, but I can't reproduce any serious slowdowns with vibe-d, Higgs, or dcd comparing 2.069.2, 2.070.2, and 2.071.2-b4.