I can try to get some timings from my machine. How do we handle crash recovery in the case where we don't spawn a child process? I thought the whole reason for spawning the cc1 driver as a separate process was so that we could collect and report crash information in a nice way. Not having that seems like a heavy price to pay.
On Wed, Oct 10, 2018 at 11:34 AM Alexandre Ganea via Phabricator < revi...@reviews.llvm.org> wrote: > aganea added a comment. > > Updated tests again. This time I've closed all applications, all unused > services, and tried to have a "clean" machine. > > New timings without the child `clang-cl.exe` being invoked (hacked from > https://reviews.llvm.org/D52411). The test consists in building > Clang+LLVM+LLD at r343846 using the compiler specified on each line of the > table. > > **Config 1:** Intel Xeon Haswell 6 cores / 12 HW threads, 3.5 GHz, 15 MB > cache, 128 GB RAM, SSD 550 MB/s (Windows 10 Fall Creators update 1709) > > __Ninja:__ > > | MSVC 15.8.6 (cl + link) > | 29 min 4 sec | > | clang-cl + lld-link 7.0 official release > | 25 min 45 sec | > | clang-cl + lld-link 8.0 r343846 //built with clang-cl 7.0 official// > **(no child)** | **23 min 27 sec** | > | > > **Config 2:** Intel Xeon Skylake 18 cores / 36 HW threads, x2 (Dual CPU), > 72 HW threads total, 2.3 GHz, 24.75 MB cache each, 128 GB RAM, NVMe SSD 4.6 > GB/s (Windows 10 Fall Creators update 1709) > > __Ninja:__ > > | MSVC 15.8.6 (cl + link) > | 6 min 40 sec | > | clang-cl + lld-link 7.0 official release > | 6 min 24 sec | > | clang-cl + lld-link 8.0 r343846 //built with clang-cl 7.0 official// > **(no child)** | **5 min 10 sec** | > | > > I'm wondering if the improvement is of the same order on Linux. I'd be > interested to see your build times, out of curiosity? Can any of you try it > with and without https://reviews.llvm.org/D52411? > > > Repository: > rC Clang > > https://reviews.llvm.org/D52193 > > > >
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