如何取消设置$ GODEBUG

I've been using Dave Cheney's gcvis tool to troubleshoot a memory leak. All went well, problem solved.

However, I have no idea how, but I cannot for the life of me stop the garbage collector output from flooding my logs, making development very difficult.

According to the runtime-package manual:

Setting gctrace to any value > 0 also causes the garbage collector to emit a summary when memory is released back to the system.

This, however, has no effect.

How can I remove the output?

I have tried the following:

Exporting to empty value

$ export GODEBUG=
$ go run main.go

Unsetting

$ unset GODEBUG
$ go run main.go

Setting to zero (also tried w / o quotation marks, just for completion)

$ export GODEBUG="gctrace=0"
$ go run main.go

Regardless, I get this output every time (package names redacted):

# my-package-0
gc 1 @0.006s 10%: 0.025+3.4+0.11 ms clock, 0.20+1.7/5.9/1.7+0.94 ms cpu, 4->4->3 MB, 5 MB goal, 8 P
gc 2 @0.019s 7%: 0.005+1.0+0.086 ms clock, 0.047+0.67/1.8/2.8+0.69 ms cpu, 5->5->4 MB, 6 MB goal, 8 P
gc 3 @0.030s 6%: 0.006+2.8+0.091 ms clock, 0.053+0.10/4.8/4.2+0.73 ms cpu, 7->8->6 MB, 8 MB goal, 8 P
gc 4 @0.050s 6%: 0.030+4.2+0.096 ms clock, 0.24+1.0/7.3/3.7+0.76 ms cpu, 13->14->8 MB, 14 MB goal, 8 P
# my-package-1
gc 1 @0.007s 5%: 0.010+2.6+0.15 ms clock, 0.086+0.19/3.4/2.6+1.2 ms cpu, 4->4->2 MB, 5 MB goal, 8 P
gc 2 @0.015s 6%: 0.007+2.5+0.11 ms clock, 0.060+0.63/3.4/2.4+0.91 ms cpu, 5->5->4 MB, 6 MB goal, 8 P
gc 3 @0.028s 6%: 0.010+3.0+0.53 ms clock, 0.084+0.23/2.7/2.4+4.2 ms cpu, 8->9->5 MB, 9 MB goal, 8 P
# my-package-3
gc 1 @0.009s 15%: 0.012+4.5+1.7 ms clock, 0.10+0.62/4.5/0.77+13 ms cpu, 4->4->2 MB, 5 MB goal, 8 P
gc 2 @0.030s 9%: 0.006+2.8+0.10 ms clock, 0.050+0.63/3.7/2.9+0.85 ms cpu, 5->5->4 MB, 6 MB goal, 8 P
gc 3 @0.043s 11%: 0.53+3.9+0.084 ms clock, 4.3+7.0/7.8/5.2+0.67 ms cpu, 9->10->7 MB, 10 MB goal, 8 P
gc 4 @0.062s 10%: 0.027+3.6+0.12 ms clock, 0.21+5.2/6.3/5.0+1.0 ms cpu, 12->13->8 MB, 14 MB goal, 8 P
# my-package-4
[...]

On request in comments, here is the output from $ go env:

GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/dimholt/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/dimholt/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/go"
GOTMPDIR=""
GOTOOLDIR="/usr/local/go/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/fx/p9gpbcnd5_jdgqyp6z1w9tqr0000gn/T/go-build333219542=/tmp/go-build -gno-record-gcc-switches -fno-common"

And my main.go:

package main

import (
    "fmt"
    "log"
    "net/http"

    "github.com/redacted/config"
    "github.com/redacted/db"
)

func main() {
    conf := config.GetConfig()

    // Connect database.
    db.Connect()
    defer db.Close()

    // Register all HTTP routes.
    registerRoutes()

    port := fmt.Sprintf(":%v", conf.Port)
    log.Printf("documents: listening on port %v", port[1:])
    log.Fatal(http.ListenAndServe(port, nil))
}

Something else is wrong.

Running GODEBUG= go run main.go should definitely run your main.go without GODEBUG on. Feel free to os.Getenv at the start of main.go to check GODEBUG - it should be off.

Can you minimize your main.go and show it? You could be setting the debug flags somehow from inside the code.

Try running go env and see what's set