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| 1 | +/* |
| 2 | +MIT License |
| 3 | +
|
| 4 | +Copyright (c) 2024 Vish Kannan |
| 5 | +
|
| 6 | +Permission is hereby granted, free of charge, to any person obtaining a copy |
| 7 | +of this software and associated documentation files (the "Software"), to deal |
| 8 | +in the Software without restriction, including without limitation the rights |
| 9 | +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 10 | +copies of the Software, and to permit persons to whom the Software is |
| 11 | +furnished to do so, subject to the following conditions: |
| 12 | +
|
| 13 | +The above copyright notice and this permission notice shall be included in all |
| 14 | +copies or substantial portions of the Software. |
| 15 | +
|
| 16 | +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 17 | +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 18 | +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 19 | +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 20 | +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 21 | +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
| 22 | +SOFTWARE. |
| 23 | +*/ |
| 24 | + |
| 25 | +// Package vishhstress was forked from <https://github.com/vishh/stress/tree/eab4e3384bcad9899b8b801b4a1917a758e97d96> |
| 26 | +// so that it can be consumed from agnhost. |
| 27 | +package vishhstress |
| 28 | + |
| 29 | +import ( |
| 30 | + "io" |
| 31 | + "io/ioutil" |
| 32 | + "os" |
| 33 | + "time" |
| 34 | + |
| 35 | + "github.com/spf13/cobra" |
| 36 | + "k8s.io/apimachinery/pkg/api/resource" |
| 37 | + "k8s.io/klog/v2" |
| 38 | +) |
| 39 | + |
| 40 | +var ( |
| 41 | + argMemTotal string |
| 42 | + argMemStepSize string |
| 43 | + argMemSleepDuration time.Duration |
| 44 | + argCpus int |
| 45 | + buffer [][]byte |
| 46 | +) |
| 47 | + |
| 48 | +// CmdStress is used by agnhost Cobra. |
| 49 | +var CmdStress = &cobra.Command{ |
| 50 | + Use: "stress", |
| 51 | + Short: "Lightweight compute resource stress utlity", |
| 52 | + Args: cobra.NoArgs, |
| 53 | + Run: main, |
| 54 | +} |
| 55 | + |
| 56 | +func init() { |
| 57 | + flags := CmdStress.Flags() |
| 58 | + flags.StringVar(&argMemTotal, "mem-total", "0", "total memory to be consumed. Memory will be consumed via multiple allocations.") |
| 59 | + flags.StringVar(&argMemStepSize, "mem-alloc-size", "4Ki", "amount of memory to be consumed in each allocation") |
| 60 | + flags.DurationVar(&argMemSleepDuration, "mem-alloc-sleep", time.Millisecond, "duration to sleep between allocations") |
| 61 | + flags.IntVar(&argCpus, "cpus", 0, "total number of CPUs to utilize") |
| 62 | +} |
| 63 | + |
| 64 | +func main(cmd *cobra.Command, _ []string) { |
| 65 | + total := resource.MustParse(argMemTotal) |
| 66 | + stepSize := resource.MustParse(argMemStepSize) |
| 67 | + klog.Infof("Allocating %q memory, in %q chunks, with a %v sleep between allocations", total.String(), stepSize.String(), argMemSleepDuration) |
| 68 | + burnCPU() |
| 69 | + allocateMemory(total, stepSize) |
| 70 | + klog.Infof("Allocated %q memory", total.String()) |
| 71 | + select {} |
| 72 | +} |
| 73 | + |
| 74 | +func burnCPU() { |
| 75 | + src, err := os.Open("/dev/zero") |
| 76 | + if err != nil { |
| 77 | + klog.Fatalf("failed to open /dev/zero") |
| 78 | + } |
| 79 | + for i := 0; i < argCpus; i++ { |
| 80 | + klog.Infof("Spawning a thread to consume CPU") |
| 81 | + go func() { |
| 82 | + _, err := io.Copy(ioutil.Discard, src) |
| 83 | + if err != nil { |
| 84 | + klog.Fatalf("failed to copy from /dev/zero to /dev/null: %v", err) |
| 85 | + } |
| 86 | + }() |
| 87 | + } |
| 88 | +} |
| 89 | + |
| 90 | +func allocateMemory(total, stepSize resource.Quantity) { |
| 91 | + for i := int64(1); i*stepSize.Value() <= total.Value(); i++ { |
| 92 | + newBuffer := make([]byte, stepSize.Value()) |
| 93 | + for i := range newBuffer { |
| 94 | + newBuffer[i] = 0 |
| 95 | + } |
| 96 | + buffer = append(buffer, newBuffer) |
| 97 | + time.Sleep(argMemSleepDuration) |
| 98 | + } |
| 99 | +} |
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