An experimental HTTP load testing application written in Rust.

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Applications Herd
Overview

Herd

Herd was a small side project in building a HTTP load testing application in Rust with a main focus on being easy to use and low on OS level dependencies such as the JVM.

Herd was developed on a pre-1.0 version of Rust, it is not unit tested and unlikley to compile on later versions of Rust, I intend to revisit this project as the Rust ecosystem matures.

Herd can spawn thousands of concurrent requests to HTTP endpoints by making use of unix process forking and multithreadding.

Herd is hardware intensive. Per each 1000 virtual users, Herd will fork itself in order to overcome hard limits set by the OS on how many active threads a process can have at any one time. Due to this, it is recomended you run Herd from a disposable machine in the cloud, high levels of virtual users can crash machines if they run out of memory or CPU resources, do not run Herd on a production machine.

Download and run

As Herd is unlikley to compile out the box, it is recomended you clone this repository and fully build from source, some alterations to the source code may be needed over time as the Rust language changes, I do not intend on continuously maintaining this project.

Dependencies:

gcc clang libssl rust cargo

Compile from source and run:
$ git clone [email protected]:imjacobclark/Herd.git && cd Herd
$ cargo build --release
$ ./target/release/herd -t <THREADS(int)> -r <REQUESTS(int)> <HOST(str)>

You can define several hosts to test with a configuration file. See example-config.yaml.

$ ./target/release/herd -c config.yaml
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Comments
  • The future of Herd

    The future of Herd

    I wondered if you planned to take this tool any further? I'd probably not use YAML to write tests as it becomes a little tricky when writing non-trivial tests. Gatling uses a DSL, but I'd probably stick to standard Rust.

    opened by ghost 3
  • Can't build on windows

    Can't build on windows

    Herd does not work on windows machines, here is the traceback:

    src\main.rs:102:20: 102:37 error: failed to resolve. Could not find `unistd` in `nix` [E0433]
src\main.rs:102         let _pid = nix::unistd::fork();
                                   ^~~~~~~~~~~~~~~~~
src\main.rs:102:20: 102:37 help: run `rustc --explain E0433` to see a detailed explanation
src\main.rs:102:20: 102:37 error: unresolved name `nix::unistd::fork` [E0425]
src\main.rs:102         let _pid = nix::unistd::fork();
                                   ^~~~~~~~~~~~~~~~~
src\main.rs:102:20: 102:37 help: run `rustc --explain E0425` to see a detailed explanation
error: aborting due to 2 previous errors
Could not compile `herd`.

    There would need to be a target for windows machines, either informing that it is not possible, or where another package would be used instead of nix. Probably: https://github.com/retep998/winapi-rs

    opened by lunemec 0
  • Record and persist relevant metrics

    Record and persist relevant metrics

    I was thinking of a stats module that does on the fly calculations at x intervals, including total and individual response times, max times, error rate and current RPS.

    These could be converted to a Graphite formatted text and pushed to port 2003 to be picked up by InfluxDB. Grafana can then read the data and present it in visual form.

    Another option would be to use a rest-client to write to InfluxDB via HTTP.

    opened by ghost 0
  • Calculate response times in percentiles

    Calculate response times in percentiles

    There is an argument that the mean can be a misleading metric if there is a high standard deviation.

    A more rounded set of metrics would be percentiles, I suggest printing the: 50, 75, 95, 99 percentiles to STDOUT.

    opened by ghost 0
Releases(v0.0.1)

  • v0.0.1(Jun 23, 2015)

    23.06.2015 - Version v0.0.1 (stable)

    • Linear test scenario strategy implemented
    • Scenario configuration via command line arguments
    • Workaround for hard thread limits set by OS w/ forks

    This release binary only supports darwin-x64, compile from source for other unix based systems.

    Source code(tar.gz)
    Source code(zip)
    herd-v0.0.1-darwin-x64.zip(6.99 MB)
Owner
Jacob Clark
Senior Technical Architect @BBC
Jacob Clark
GitHub
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