38174b3a35
go/build is one of the packages that contributes the most towards cmd/go's init cost, which adds up to any call to the tool. One piece of low-hanging fruit is knownOS and knownArch, maps which are filled via an init func from a space-separated list. Using GODEBUG=inittrace=1, we can get three samples: init go/build @0.36 ms, 0.024 ms clock, 6568 bytes, 74 allocs init go/build @0.33 ms, 0.025 ms clock, 6888 bytes, 76 allocs init go/build @0.36 ms, 0.025 ms clock, 6728 bytes, 75 allocs After using a static map instead, we see an improvement: init go/build @0.33 ms, 0.018 ms clock, 5096 bytes, 69 allocs init go/build @0.36 ms, 0.021 ms clock, 5096 bytes, 69 allocs init go/build @0.33 ms, 0.019 ms clock, 5096 bytes, 69 allocs The speedup isn't huge, but it helps, and also reduces allocs. One can also imagine that the compiler may get better with static, read-only maps in the future, whereas the init func will likely always have a linear cost and extra allocations. Change-Id: I430212bad03d25358d2cc7b1eab4536ad88d05a8 Reviewed-on: https://go-review.googlesource.com/c/go/+/390274 Run-TryBot: Daniel Martí <mvdan@mvdan.cc> Trust: Daniel Martí <mvdan@mvdan.cc> TryBot-Result: Gopher Robot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> |
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