9678f79414
We need VCS status information for each main package we load. If two main packages are under the same VCS repository, we can reuse that information to avoid duplicating work. For instance, the kubernetes holds 51 main packages in its root module, meaning that "go list ./..." repeated the same git calls 51 times. Instead, use a global par.Cache to deduplicate that work. Below are the numbers on kubernetes 5eb584d1cb6917, via "benchcmd -n 8 KubernetesListPackages go list ./...": name old time/op new time/op delta KubernetesListPackages 8.91s ± 0% 3.33s ± 1% -62.61% (p=0.000 n=7+8) name old user-time/op new user-time/op delta KubernetesListPackages 11.2s ± 1% 8.1s ± 2% -27.50% (p=0.000 n=7+8) name old sys-time/op new sys-time/op delta KubernetesListPackages 8.02s ± 0% 1.67s ± 6% -79.21% (p=0.001 n=6+8) name old peak-RSS-bytes new peak-RSS-bytes delta KubernetesListPackages 127MB ± 2% 123MB ± 7% ~ (p=0.328 n=8+8) Fixes #49582. Change-Id: Ib7ef5dc7a35c83a11e209441f5d6f3b8da068259 Reviewed-on: https://go-review.googlesource.com/c/go/+/365394 Trust: Daniel Martí <mvdan@mvdan.cc> Trust: Dominik Honnef <dominik@honnef.co> Run-TryBot: Bryan C. Mills <bcmills@google.com> Reviewed-by: Bryan C. Mills <bcmills@google.com> TryBot-Result: Go Bot <gobot@golang.org> |
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