Vegeta is a versatile HTTP load testing tool built out of need to drill HTTP services with a constant request rate. It can be used both as a command line utility and a library.

This fork ads support to attacking with multiple rates and a csv reporter suitable for import into spreadsheet applications.

You need go installed and GOBIN in your PATH. Once that is done, run the command:

$ go get github.com/tsenart/vegeta
$ go install github.com/tsenart/vegeta

$ echo "GET http://localhost/" | vegeta rapid -rates=100,200,300 -duration=10s | vegeta report -reporter=csv

$ vegeta -h
Usage: vegeta [globals] <command> [options]

Commands:
  attack  Hit the targets
  report  Report the results
  rapid   Hit the targets with multiple rates 

Globals:
  -cpus=8 Number of CPUs to use

Specifies the number of CPUs to be used internally. It defaults to the amount of CPUs available in the system.

$ vegeta attack -h
Usage of attack:
  -duration=10s: Duration of the test
  -header=: Targets request header
  -ordering="random": Attack ordering [sequential, random]
  -output="stdout": Output file
  -rate=50: Requests per second
  -targets="stdin": Targets file

Specifies the amount of time to issue request to the targets. The internal concurrency structure's setup has this value as a variable. The actual run time of the test can be longer than specified due to the responses delay.

Specifies a request header to be used in all targets defined. You can specify as many as needed by repeating the flag.

Specifies the ordering of target attack. The default is random and it will randomly pick one of the targets per request without ever choosing that target again. The other option is sequential and it does what you would expect it to do.

Specifies the output file to which the binary results will be written to. Made to be piped to the report command input. Defaults to stdout.

Specifies the requests per second rate to issue against the targets. The actual request rate can vary slightly due to things like garbage collection, but overall it should stay very close to the specified.

Specifies the attack targets in a line separated file, defaulting to stdin. The format should be as follows.

GET http://goku:9090/path/to/dragon?item=balls
GET http://user:password@goku:9090/path/to
HEAD http://goku:9090/path/to/success
...

$ vegeta report -h
Usage of report:
  -input="stdin": Input files (comma separated)
  -output="stdout": Output file
  -reporter="text": Reporter [text, json, plot]

Specifies the input files to generate the report of, defaulting to stdin. These are the output of vegeta attack. You can specify more than one (comma separated) and they will be merged and sorted before being used by the reports.

Specifies the output file to which the report will be written to.

Specifies the kind of report to be generated. It defaults to text.

Requests      [total]               1200
Duration      [total]               1.998307684s
Latencies     [mean, 95, 99, max]   223.340085ms, 326.913687ms, 416.537743ms, 7.788103259s
Bytes In      [total, mean]         3714690, 3095.57
Bytes Out     [total, mean]         0, 0.00
Success       [ratio]               55.42%
Status Codes  [code:count]          0:535  200:665
Error Set:
Get http://localhost:6060: dial tcp 127.0.0.1:6060: connection refused
Get http://localhost:6060: read tcp 127.0.0.1:6060: connection reset by peer
Get http://localhost:6060: dial tcp 127.0.0.1:6060: connection reset by peer
Get http://localhost:6060: write tcp 127.0.0.1:6060: broken pipe
Get http://localhost:6060: net/http: transport closed before response was received
Get http://localhost:6060: http: can't write HTTP request on broken connection

{
  "latencies": {
    "mean": 9093653647,
    "95th": 12553709381,
    "99th": 12604629125,
    "max": 12604629125
  },
  "bytes_in": {
    "total": 782040,
    "mean": 651.7
  },
  "bytes_out": {
    "total": 0,
    "mean": 0
  },
  "duration": 1998307684,
  "requests": 1200,
  "success": 0.11666666666666667,
  "status_codes": {
    "0": 1060,
    "200": 140
  },
  "errors": [
    "Get http://localhost:6060: dial tcp 127.0.0.1:6060: operation timed out"
  ]
}

Generates an HTML5 page with an interactive plot based on Dygraphs. Click and drag to select a region to zoom into. Double click to zoom out. Input a different number on the bottom left corner input field to change the moving average window size (in data points).

package main

import (
  vegeta "github.com/tsenart/vegeta/lib"
  "time"
  "fmt"
)

func main() {
  targets, _ := vegeta.NewTargets([]string{"GET http://localhost:9100/"})
  rate := uint64(100) // per second
  duration := 4 * time.Second

  results := vegeta.Attack(targets, rate, duration)
  metrics := vegeta.NewMetrics(results)

  fmt.Printf("Mean latency: %s", metrics.Latencies.Mean)
}

There will be an upper bound of the supported rate which varies on the machine being used. You could be CPU bound (unlikely), memory bound (more likely) or have system resource limits being reached which ought to be tuned for the process execution. The important limits for us are file descriptors and processes. On a UNIX system you can get and set the current soft-limit values for a user.

$ ulimit -n # file descriptors
2560
$ ulimit -u # processes / threads
709

Just pass a new number as the argument to change it.

The MIT License (MIT)

Copyright (c) 2013 Tomás Senart

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