oha (おはよう)

oha is a tiny program that sends some load to a web application and show realtime tui inspired by rakyll/hey.

This program is written in Rust and powered by tokio and beautiful tui by ratatui.

Installation

This program is built on stable Rust, with both make and cmake prerequisites to install via cargo.

cargo install oha

You can optionally build oha against native-tls instead of rustls.

cargo install --no-default-features --features rustls oha

You can enable VSOCK support by enabling vsock feature.

cargo install --features vsock oha

On Arch Linux

pacman -S oha

On macOS (Homebrew)

brew install oha

On Windows (winget)

winget install hatoo.oha

On Debian (Azlux's repository)

echo "deb [signed-by=/usr/share/keyrings/azlux-archive-keyring.gpg] http://packages.azlux.fr/debian/ stable main" | sudo tee /etc/apt/sources.list.d/azlux.list
sudo wget -O /usr/share/keyrings/azlux-archive-keyring.gpg https://azlux.fr/repo.gpg
apt update
apt install oha

X-CMD (Linux, macOS, Windows WSL/GitBash)

You can install with x-cmd.

x env use oha

Containerized

You can also build and create a container image including oha

docker build . -t example.com/hatoo/oha:latest

Then you can use oha directly through the container

docker run -it example.com/hatoo/oha:latest https://example.com:3000

Profile-Guided Optimization (PGO)

You can build oha with PGO by using the following commands:

bun run pgo.js

And the binary will be available at target/[target-triple]/pgo/oha.

Platform

• Linux - Tested on Ubuntu 18.04 gnome-terminal
• Windows 10 - Tested on Windows Powershell
• MacOS - Tested on iTerm2

Usage

-q option works different from rakyll/hey. It's set overall query per second instead of for each workers.

Ohayou(おはよう), HTTP load generator, inspired by rakyll/hey with tui animation.

Usage: oha [OPTIONS] <URL>

Arguments:
  <URL>  Target URL.

Options:
  -n <N_REQUESTS>
          Number of requests to run. [default: 200]
  -c <N_CONNECTIONS>
          Number of connections to run concurrently. You may should increase limit to number of open files for larger `-c`. [default: 50]
  -p <N_HTTP2_PARALLEL>
          Number of parallel requests to send on HTTP/2. `oha` will run c * p concurrent workers in total. [default: 1]
  -z <DURATION>
          Duration of application to send requests. If duration is specified, n is ignored.
          On HTTP/1, When the duration is reached, ongoing requests are aborted and counted as "aborted due to deadline"
          You can change this behavior with `-w` option.
          Currently, on HTTP/2, When the duration is reached, ongoing requests are waited. `-w` option is ignored.
          Examples: -z 10s -z 3m.
  -w, --wait-ongoing-requests-after-deadline
          When the duration is reached, ongoing requests are waited
  -q <QUERY_PER_SECOND>
          Rate limit for all, in queries per second (QPS)
      --burst-delay <BURST_DURATION>
          Introduce delay between a predefined number of requests.
          Note: If qps is specified, burst will be ignored
      --burst-rate <BURST_REQUESTS>
          Rates of requests for burst. Default is 1
          Note: If qps is specified, burst will be ignored
      --rand-regex-url
          Generate URL by rand_regex crate but dot is disabled for each query e.g. http://127.0.0.1/[a-z][a-z][0-9]. Currently dynamic scheme, host and port with keep-alive are not works well. See https://docs.rs/rand_regex/latest/rand_regex/struct.Regex.html for details of syntax.
      --max-repeat <MAX_REPEAT>
          A parameter for the '--rand-regex-url'. The max_repeat parameter gives the maximum extra repeat counts the x*, x+ and x{n,} operators will become. [default: 4]
      --dump-urls <DUMP_URLS>
          Dump target Urls <DUMP_URLS> times to debug --rand-regex-url
      --latency-correction
          Correct latency to avoid coordinated omission problem. It's ignored if -q is not set.
      --no-tui
          No realtime tui
  -j, --json
          Print results as JSON
      --fps <FPS>
          Frame per second for tui. [default: 16]
  -m, --method <METHOD>
          HTTP method [default: GET]
  -H <HEADERS>
          Custom HTTP header. Examples: -H "foo: bar"
  -t <TIMEOUT>
          Timeout for each request. Default to infinite.
  -A <ACCEPT_HEADER>
          HTTP Accept Header.
  -d <BODY_STRING>
          HTTP request body.
  -D <BODY_PATH>
          HTTP request body from file.
  -T <CONTENT_TYPE>
          Content-Type.
  -a <BASIC_AUTH>
          Basic authentication, username:password
      --http-version <HTTP_VERSION>
          HTTP version. Available values 0.9, 1.0, 1.1.
      --http2
          Use HTTP/2. Shorthand for --http-version=2
      --host <HOST>
          HTTP Host header
      --disable-compression
          Disable compression.
  -r, --redirect <REDIRECT>
          Limit for number of Redirect. Set 0 for no redirection. Redirection isn't supported for HTTP/2. [default: 10]
      --disable-keepalive
          Disable keep-alive, prevents re-use of TCP connections between different HTTP requests. This isn't supported for HTTP/2.
      --no-pre-lookup
          *Not* perform a DNS lookup at beginning to cache it
      --ipv6
          Lookup only ipv6.
      --ipv4
          Lookup only ipv4.
      --insecure
          Accept invalid certs.
      --connect-to <CONNECT_TO>
          Override DNS resolution and default port numbers with strings like 'example.org:443:localhost:8443'
      --disable-color
          Disable the color scheme.
      --unix-socket <UNIX_SOCKET>
          Connect to a unix socket instead of the domain in the URL. Only for non-HTTPS URLs.
      --stats-success-breakdown
          Include a response status code successful or not successful breakdown for the time histogram and distribution statistics
      --db-url <DB_URL>
          Write succeeded requests to sqlite database url E.G test.db
      --debug
          Perform a single request and dump the request and response
  -h, --help
          Print help
  -V, --version
          Print version

JSON output

oha prints JSON output when -j option is set. The schema of JSON output is defined in schema.json.

Benchmark

Performance Comparison

We used hyperfine for benchmarking oha against rakyll/hey on a local server. The server was coded using node. You can start the server by copy pasting this file and then running it via node. After copy-pasting the file, you can run the benchmark via hyperfine.

1. Copy-paste the contents into a new javascript file called app.js

const http = require("http");

const server = http.createServer((req, res) => {
  res.writeHead(200, { "Content-Type": "text/plain" });

  res.end("Hello World\n");
});

server.listen(3000, () => {
  console.log("Server running at http://localhost:3000/");
});

2. Run node app.js
3. Run hyperfine 'oha --no-tui http://localhost:3000' 'hey http://localhost:3000' in a different terminal tab

Benchmark Results

Benchmark 1: oha --no-tui http://localhost:3000

• Time (mean ± σ): 10.8 ms ± 1.8 ms [User: 5.7 ms, System: 11.7 ms]
• Range (min … max): 8.7 ms … 24.8 ms (107 runs)

Benchmark 2: hey http://localhost:3000

• Time (mean ± σ): 14.3 ms ± 4.6 ms [User: 12.2 ms, System: 19.4 ms]
• Range (min … max): 11.1 ms … 48.3 ms (88 runs)

Summary

In this benchmark, oha --no-tui http://localhost:3000 was found to be faster, running approximately 1.32 ± 0.48 times faster than hey http://localhost:3000.

Tips

Stress test in more realistic condition

oha uses default options inherited from rakyll/hey but you may need to change options to stress test in more realistic condition.

I suggest to run oha with following options.

oha <-z or -n> -c <number of concurrent connections> -q <query per seconds> --latency-correction --disable-keepalive <target-address>

• --disable-keepalive

  In real, user doesn't query same URL using Keep-Alive. You may want to run without Keep-Alive.

• --latency-correction

  You can avoid Coordinated Omission Problem by using --latency-correction.

Burst feature

You can use --burst-delay along with --burst-rate option to introduce delay between a defined number of requests.

oha -n 10 --burst-delay 2s --burst-rate 4

In this particular scenario, every 2 seconds, 4 requests will be processed, and after 6s the total of 10 requests will be processed. NOTE: If you don't set --burst-rate option, the amount is default to 1

Dynamic url feature

You can use --rand-regex-url option to generate random url for each connection.

oha --rand-regex-url http://127.0.0.1/[a-z][a-z][0-9]

Each Urls are generated by rand_regex crate but regex's dot is disabled since it's not useful for this purpose and it's very inconvenient if url's dots are interpreted as regex's dot.

Optionally you can set --max-repeat option to limit max repeat count for each regex. e.g http://127.0.0.1/[a-z]* with --max-repeat 4 will generate url like http://127.0.0.1/[a-z]{0,4}

Currently dynamic scheme, host and port with keep-alive are not works well.

Contribution

Feel free to help us!

Here are some issues to improving.

• Write tests
• Improve tui design.
  • Show more information?
  • There are no color in realtime tui now. I want help from someone who has some color sense.
• Improve speed
  • I'm new to tokio. I think there are some space to optimize query scheduling.