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cmd/go: timing out on plan9/386 builder #29822

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0intro opened this issue Jan 18, 2019 · 8 comments
Closed

cmd/go: timing out on plan9/386 builder #29822

0intro opened this issue Jan 18, 2019 · 8 comments
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Builders x/build issues (builders, bots, dashboards) FrozenDueToAge OS-Plan9
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Unplanned

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@0intro
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0intro commented Jan 18, 2019

Since the addition of many new tests in cmd/go during the last
few weeks, the cmd/go tests are timing out on the plan9/386
builder running on GCE.

Test "go_test:cmd/go" ran over 20m0s limit (20m0.001784079s)

This is related to CL 158537.
@0intro 0intro added OS-Plan9 Builders x/build issues (builders, bots, dashboards) labels Jan 18, 2019
@0intro 0intro added this to the Go1.12 milestone Jan 18, 2019
@0intro 0intro self-assigned this Jan 18, 2019
@bradfitz
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Sorry, but this is not Go 1.12 material.

The Plan 9 port exists on a best effort basis.

@bradfitz bradfitz modified the milestones: Go1.12, Unplanned Jan 18, 2019
@bcmills
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bcmills commented Jan 18, 2019 •
edited

Are they that slow even in -short mode?

Is there something about plan9 that makes operations dramatically slower than everywhere else? (go test -short cmd/go currently takes ~37s on my 6-core workstation.)

@bcmills
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bcmills commented Jan 18, 2019

Or is there something deadlocking in the test?

@0intro
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0intro commented Jan 18, 2019 •
edited

File I/O are slow on Plan 9. There was a deadlock in ramfs related to the use of the lockfile package, but I fixed in November (issue #29033). Now, the cmd/go tests complete, but it takes more than 20m (the coordinator timeout) to complete on GCE.

I plan to enable SMP on the Plan 9 image, so the cmd/go tests could complete significantly faster.

@gopherbot
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Change https://golang.org/cl/158597 mentions this issue: env: enable SMP in Plan 9 image

@gopherbot
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Change https://golang.org/cl/158541 mentions this issue: dashboard: bump plan9 GCE image

@bradfitz
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Deployed & cleared the plan 9 column again. Let's see what happens.

gopherbot pushed a commit to golang/build that referenced this issue Jan 18, 2019
@bradfitz
dashboard: bump plan9 GCE image
ce20899 
Includes CL 158597 (enable SMP in Plan 9 image)

Updates golang/go#29822

Change-Id: Ic158c5153e79635ff1bc877d5dfb12a98f380d50
Reviewed-on: https://go-review.googlesource.com/c/158541
Reviewed-by: Bryan C. Mills <bcmills@google.com>
@gopherbot
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Change https://golang.org/cl/158542 mentions this issue: env/plan9: revert SMP changes, stop running cmd/go tests

gopherbot pushed a commit to golang/build that referenced this issue Jan 18, 2019
@bradfitz
env/plan9: revert SMP changes, stop running cmd/go tests
a865ae3 
Revert "env: enable SMP in Plan 9 image"
This reverts commit 6478d3e.

Revert "dashboard: bump plan9 GCE image"
This reverts commit ce20899.

Updates golang/go#29822

Change-Id: I47e75d135e092ee9d5a80c66e91c1048c67cd5f6
Reviewed-on: https://go-review.googlesource.com/c/158542
Reviewed-by: Bryan C. Mills <bcmills@google.com>
Reviewed-by: David du Colombier <0intro@gmail.com>
@0intro 0intro mentioned this issue May 8, 2019
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@golang golang locked and limited conversation to collaborators Jan 18, 2020
@rsc rsc unassigned 0intro Jun 23, 2022
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@bradfitz @bcmills @0intro @gopherbot