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kata-overhead.go
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/
kata-overhead.go
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// +build cgo,linux
// Copyright (c) 2014,2015,2016 Docker, Inc.
// Copyright (c) 2019 Intel Corporation
//
// SPDX-License-Identifier: Apache-2.0
//
package main
import (
"context"
"fmt"
"time"
"github.com/kata-containers/runtime/pkg/katautils"
"github.com/kata-containers/runtime/virtcontainers/types"
"github.com/sirupsen/logrus"
"github.com/urfave/cli"
)
var kataOverheadCLICommand = cli.Command{
Name: "kata-overhead",
Usage: "provides kata overhead at sandbox level",
ArgsUsage: `<sandbox-id> [sandbox-id...]
<sandbox-id> is your name for the instance of the sandbox.`,
Description: `The kata-overhead command shows the overhead of a running Kata sandbox. Overhead
is calculated as the sum of pod resource utilization as measured on host cgroup minus the total
container usage measured inside the Kata guest for each container's cgroup.`,
Action: func(context *cli.Context) error {
ctx, err := cliContextToContext(context)
if err != nil {
return err
}
args := context.Args()
if !args.Present() {
return fmt.Errorf("Missing container ID, should at least provide one")
}
for _, cID := range []string(args) {
if err := overhead(ctx, cID); err != nil {
return err
}
}
return nil
},
}
func overhead(ctx context.Context, containerID string) error {
span, _ := katautils.Trace(ctx, "overhead")
defer span.Finish()
kataLog = kataLog.WithField("container", containerID)
setExternalLoggers(ctx, kataLog)
span.SetTag("container", containerID)
status, sandboxID, err := getExistingContainerInfo(ctx, containerID)
if err != nil {
return err
}
containerID = status.ID
kataLog = kataLog.WithFields(logrus.Fields{
"container": containerID,
"sandbox": sandboxID,
})
setExternalLoggers(ctx, kataLog)
span.SetTag("container", containerID)
span.SetTag("sandbox", sandboxID)
if status.State.State == types.StateStopped {
return fmt.Errorf("container with id %s is not running", status.ID)
}
initTime := time.Now().UnixNano()
initialSandboxStats, initialContainerStats, err := vci.StatsSandbox(ctx, sandboxID)
if err != nil {
return err
}
hostInitCPU := initialSandboxStats.CgroupStats.CPUStats.CPUUsage.TotalUsage
guestInitCPU := uint64(0)
for _, cs := range initialContainerStats {
guestInitCPU += cs.CgroupStats.CPUStats.CPUUsage.TotalUsage
}
// Wait for 1 second to calculate CPU usage
time.Sleep(time.Second * 1)
finishtTime := time.Now().UnixNano()
finishSandboxStats, finishContainersStats, err := vci.StatsSandbox(ctx, sandboxID)
if err != nil {
return err
}
hostFinalCPU := finishSandboxStats.CgroupStats.CPUStats.CPUUsage.TotalUsage
guestFinalCPU := uint64(0)
for _, cs := range finishContainersStats {
guestFinalCPU += cs.CgroupStats.CPUStats.CPUUsage.TotalUsage
}
var guestMemoryUsage uint64
for _, cs := range finishContainersStats {
guestMemoryUsage += cs.CgroupStats.MemoryStats.Usage.Usage
}
hostMemoryUsage := finishSandboxStats.CgroupStats.MemoryStats.Usage.Usage
deltaTime := finishtTime - initTime
cpuUsageGuest := float64(guestFinalCPU-guestInitCPU) / float64(deltaTime) * 100
cpuUsageHost := float64(hostFinalCPU-hostInitCPU) / float64(deltaTime) * 100
fmt.Printf("Sandbox overhead for container: %s\n", containerID)
fmt.Printf("cpu_overhead=%f\n", cpuUsageHost-cpuUsageGuest)
fmt.Printf("memory_overhead_bytes=%d\n\n", hostMemoryUsage-guestMemoryUsage)
fmt.Printf(" --CPU details--\n")
fmt.Printf("cpu_host=%f\n", cpuUsageHost)
fmt.Printf("\tcpu_host_init=%d\n", hostInitCPU)
fmt.Printf("\tcpu_host_final=%d\n", hostFinalCPU)
fmt.Printf("cpu_guest=%f\n", cpuUsageGuest)
fmt.Printf("\tcpu_guest_init=%d\n", guestInitCPU)
fmt.Printf("\tcpu_guest_final=%d\n", guestFinalCPU)
fmt.Printf("Number of available vCPUs=%d\n", finishSandboxStats.Cpus)
fmt.Printf(" --Memory details--\n")
fmt.Printf("memory_host_bytes=%d\n", hostMemoryUsage)
fmt.Printf("memory_guest_bytes=%d\n\n", guestMemoryUsage)
return nil
}