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gccgo: compiling cmd/internal/obj/x86 on ppc64le takes 14.5GB of RAM and 20 minutes of CPU #35661

mdempsky opened this issue Nov 18, 2019 · 0 comments


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@mdempsky mdempsky commented Nov 18, 2019

Bootstrapping the Go distribution using this version of gccgo takes an excessive amount of time:

$ go version
go version go1.12.2 gccgo (GCC) 9.2.1 20190827 (Red Hat 9.2.1-1) linux/ppc64le

Specifically, while compiling cmd/internal/obj/x86, go1 seems to take nearly 20 minutes and uses 14.5GB of RAM for the first 8.5 minutes (after that, it drops to 3GB of RAM). For comparison, make.bash in its entirety takes about 24 minutes of wall clock time and 33 minutes of CPU time.

It seems like the large arrays/slices in that package are hitting some super-linear complexity.

/cc @ianlancetaylor

@mdempsky mdempsky added this to the Gccgo milestone Nov 18, 2019
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