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cmd/go: 3x performance regression in go test relative to Go 1.11 #28525

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davecheney opened this issue Nov 1, 2018 · 2 comments
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cmd/go: 3x performance regression in go test relative to Go 1.11 #28525

davecheney opened this issue Nov 1, 2018 · 2 comments
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@davecheney
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Please answer these questions before submitting your issue. Thanks!

What version of Go are you using (go version)?

% go version
go version devel +01f0dbbafc Thu Nov 1 00:54:46 2018 +0000 darwin/amd64

Does this issue reproduce with the latest release?

yes

What operating system and processor architecture are you using (go env)?

darwin/amd64

What did you do?

(~/src/github.com/heptio/contour) % time go1.11 test ./...
?       github.com/heptio/contour/apis/contour/v1beta1  [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned    [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/fake       [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/scheme     [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/typed/contour/v1beta1      [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/typed/contour/v1beta1/fake [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/contour     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/contour/v1beta1     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/internalinterfaces  [no test files]
?       github.com/heptio/contour/apis/generated/listers/contour/v1beta1        [no test files]
ok      github.com/heptio/contour/cmd/contour   (cached)
ok      github.com/heptio/contour/internal/contour      (cached)
ok      github.com/heptio/contour/internal/dag  (cached)
?       github.com/heptio/contour/internal/debug        [no test files]
ok      github.com/heptio/contour/internal/e2e  (cached)
ok      github.com/heptio/contour/internal/envoy        (cached)
ok      github.com/heptio/contour/internal/grpc (cached)
?       github.com/heptio/contour/internal/httpsvc      [no test files]
ok      github.com/heptio/contour/internal/k8s  (cached)
ok      github.com/heptio/contour/internal/metrics      (cached)

real    0m1.148s
user    0m2.947s
sys     0m1.139s

What did you expect to see?

wall time for go test should be the same or better than Go 1.11.

What did you see instead?

(~/src/github.com/heptio/contour) % time go test ./...
?       github.com/heptio/contour/apis/contour/v1beta1  [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned    [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/fake       [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/scheme     [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/typed/contour/v1beta1      [no test files]
?       github.com/heptio/contour/apis/generated/clientset/versioned/typed/contour/v1beta1/fake [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/contour     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/contour/v1beta1     [no test files]
?       github.com/heptio/contour/apis/generated/informers/externalversions/internalinterfaces  [no test files]
?       github.com/heptio/contour/apis/generated/listers/contour/v1beta1        [no test files]
ok      github.com/heptio/contour/cmd/contour   (cached)
ok      github.com/heptio/contour/internal/contour      (cached)
ok      github.com/heptio/contour/internal/dag  (cached)
?       github.com/heptio/contour/internal/debug        [no test files]
ok      github.com/heptio/contour/internal/e2e  (cached)
ok      github.com/heptio/contour/internal/envoy        (cached)
ok      github.com/heptio/contour/internal/grpc (cached)
?       github.com/heptio/contour/internal/httpsvc      [no test files]
ok      github.com/heptio/contour/internal/k8s  (cached)
ok      github.com/heptio/contour/internal/metrics      (cached)

real    0m5.247s
user    0m5.312s
sys     0m3.849s

Go test time has regressed by 3x

/cc @andybons
@agnivade
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agnivade commented Nov 1, 2018

It seems either the test is cached or there are no test files. I wonder where so much time is being spent on.

@davecheney
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I've removed ~/Library/Caches/go-build and this resolved the problem.

@golang golang locked and limited conversation to collaborators Nov 1, 2019
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@davecheney @agnivade @gopherbot