x/tools/go/ssa: requires tons of memory for testing

[mikioh]

For example, on linux-amd64-nocgo (http://build.golang.org/log/00d8b3a0c6186837e4e3d83cc06a69797734f202),

ok      golang.org/x/tools/go/pointer   57.885s
fatal error: runtime: out of memory

runtime stack:
runtime.throw(0x85dd00, 0x16)
    /tmp/workdir/go/src/runtime/panic.go:527 +0x90
runtime.sysMap(0xc8628c0000, 0x100000, 0xbd100, 0xa14418)
    /tmp/workdir/go/src/runtime/mem_linux.go:203 +0x9b
runtime.mHeap_SysAlloc(0x9f4940, 0x100000, 0x0)
    /tmp/workdir/go/src/runtime/malloc.go:426 +0x160
runtime.mHeap_Grow(0x9f4940, 0x8, 0x0)
    /tmp/workdir/go/src/runtime/mheap.go:628 +0x63
runtime.mHeap_AllocSpanLocked(0x9f4940, 0x1, 0x7f0aeb59d390)
    /tmp/workdir/go/src/runtime/mheap.go:532 +0x5f1
runtime.mHeap_Alloc_m(0x9f4940, 0x1, 0x9, 0x7f0aeb59d390)
    /tmp/workdir/go/src/runtime/mheap.go:425 +0x1ac
runtime.mHeap_Alloc.func1()
    /tmp/workdir/go/src/runtime/mheap.go:484 +0x41
runtime.systemstack(0xc820167e50)
    /tmp/workdir/go/src/runtime/asm_amd64.s:278 +0xab
runtime.mHeap_Alloc(0x9f4940, 0x1, 0x10000000009, 0x40db44)
    /tmp/workdir/go/src/runtime/mheap.go:485 +0x63
runtime.mCentral_Grow(0x9fc778, 0x0)
    /tmp/workdir/go/src/runtime/mcentral.go:190 +0x93
runtime.mCentral_CacheSpan(0x9fc778, 0x7f0aeb59d390)
    /tmp/workdir/go/src/runtime/mcentral.go:86 +0x4d4
runtime.mCache_Refill(0x7f0aec5a3000, 0x9, 0x7f0aeb59d390)
    /tmp/workdir/go/src/runtime/mcache.go:118 +0xcf
runtime.mallocgc.func2()
    /tmp/workdir/go/src/runtime/malloc.go:614 +0x2b
runtime.systemstack(0xc820016000)
    /tmp/workdir/go/src/runtime/asm_amd64.s:262 +0x79
runtime.mstart()
    /tmp/workdir/go/src/runtime/proc1.go:668

(snip)

created by golang.org/x/tools/go/ssa.(*Program).Build
    /tmp/workdir/gopath/src/golang.org/x/tools/go/ssa/builder.go:2248 +0x12a
FAIL    golang.org/x/tools/go/ssa   28.128s

[bradfitz]

/cc @alandonovan @griesemer

As I told Robert, these machines have 1.8GB of memory to do nothing but run all.bash, essentially.

[griesemer]

The question though is: Do these machines have less memory than the others?
Because these tests run fine on the other platforms.

• gri

On Tue, Jan 26, 2016 at 11:29 PM, Brad Fitzpatrick <notifications@github.com

wrote:

/cc @alandonovan https://github.com/alandonovan @griesemer
https://github.com/griesemer

As I told Robert, these machines have 1.8GB of memory to do nothing but
run all.bash, essentially.

—
Reply to this email directly or view it on GitHub
#14113 (comment).

[bradfitz]

Nope. Same. https://github.com/golang/build/blob/master/dashboard/builders.go

The race builders are bigger, but the rest are the same.

[bradfitz]

I can reproduce this on Linux with no special care on my development machine (not a builder).

Our tests should not require multiple gigabytes of memory.

I'm going to disable it.

@alandonovan, @griesemer, if these tests are important, put them on a diet. I don't know what they're doing, but it's too much.

[bradfitz]

I saw it running two tests at once, one using 1.2GB and one using 700+MB. That's the limit of the machine. If the Linux builders have no swap, that explains their death. It's possible other machines are just swapping a bunch.

[cespare]

The only heavyweight test is TestStdlib which "runs the SSA builder in sanity-checking mode on all packages beneath $GOROOT". That test uses 1.3GB to run on my Linux machine.

Perhaps that test should use a small subset of the stdlib packages by default.

Alternatively, the test could collect its statistics package-by-package rather than loading all packages at once, but it does do one global function uniqueness check that would be incompatible with this approach.

[griesemer]

We should just have a -short version: In that case, the test runs just over
say $GOROOT/src/go.

• gri

On Wed, Jan 27, 2016 at 4:06 PM, Caleb Spare notifications@github.com
wrote:

The only heavyweight test is TestStdlib which "runs the SSA builder in
sanity-checking mode on all packages beneath $GOROOT". That test uses 1.3GB
to run on my Linux machine.

Perhaps that test should use a small subset of the stdlib packages by
default.

Alternatively, the test could collect its statistics package-by-package
rather than loading all packages at once, but it does do one global
function uniqueness check that would be incompatible with this approach.

—
Reply to this email directly or view it on GitHub
#14113 (comment).

[gopherbot]

Change https://golang.org/cl/360837 mentions this issue: go/pointer: skip TestInput on 32-bit platforms