[PATCH] D71786: RFC: [Support] On Windows, add optional support for rpmalloc

[Russell Gallop via Phabricator via llvm-commits]

russell.gallop added a comment.

I have done some performance evaluations here and LLVM_ENABLE_RPMALLOC does seem to improve ThinLTO link times and CPU utilisation during ThinLTO.

There are two other things to note:
1). This also seems to improve compile time by around 5% for me. Presumably this is due to some other benefit of rpmalloc as (AFAIK) clang.exe does not use multiple threads.
2). This can significantly increase memory usage. Part of this can be attributed to the increased parallelism but I don't think that entirely explains it. I think that rpmalloc is using more memory. Have you experimented with settings such as here: https://github.com/mjansson/rpmalloc/blob/develop/CACHE.md?


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