gops is a command to list and diagnose Go processes currently running on your system.

$ gops
983     uplink-soecks	(/usr/local/bin/uplink-soecks)
52697   gops	(/Users/jbd/bin/gops)
4132*   foops (/Users/jbd/bin/foops)
51130   gocode	(/Users/jbd/bin/gocode)

$ go get -u github.com/google/gops

For processes that starts the diagnostics agent, gops can report additional information such as the current stack trace, Go version, memory stats, etc.

In order to start the diagnostics agent, see the hello example.

package main

import (
	"log"
	"time"

	"github.com/google/gops/agent"
)

func main() {
	if err := agent.Listen(nil); err != nil {
		log.Fatal(err)
	}
	time.Sleep(time.Hour)
}

To print all go processes, run gops without arguments:

$ gops
983     uplink-soecks	(/usr/local/bin/uplink-soecks)
52697   gops	(/Users/jbd/bin/gops)
4132*   foops (/Users/jbd/bin/foops)
51130   gocode	(/Users/jbd/bin/gocode)

Note that processes running the agent are marked with * next to the PID (e.g. 4132*).

In order to print the current stack trace from a target program, run the following command:

$ gops stack <pid>

To print the current memory stats, run the following command:

$ gops memstats <pid>

gops supports CPU and heap pprof profiles. After reading either heap or CPU profile, it shells out to the go tool pprof and let you interatively examine the profiles.

To enter the CPU profile, run:

$ gops pprof-cpu <pid>

To enter the heap profile, run:

$ gops pprof-heap <pid>

If you want to force run garbage collection on the target program, run the following command. It will block until the GC is completed.

$ gops gc <pid>

gops reports the Go version the target program is built with, if you run the following:

$ gops version <pid>

To print the runtime statistics such as number of goroutines and GOMAXPROCS, run the following:

$ gops stats <pid>