14 releases (7 breaking)

0.8.4 Aug 19, 2023
0.8.2 Nov 23, 2022

#33 in Profiling

32 downloads per month

MIT license

441 lines

checks tests


Simple and fast HTTP load testing tool written in Rust. All the actual functionality is provided by inquisitor-core, while this crate contains the command-line executable.

This project is currently a work in progress.

Building and Installing

From Source

Clone the repo and build:

$ git clone https://github.com/yds12/inquisitor
$ cd inquisitor
$ cargo build --release

With Cargo

Install via cargo with:

$ cargo install inquisitor


As an example, you can run with:

$ inquisitor -n 1000 -c 10 https://localhost:8080/test

This will hit the URL specified, (at least and approximately) -n number of times, using a pool of -c HTTP connections (in parallel, one tokio task per connection). These parameters need to be adjusted according to your environment.

Another way to run the tests is limiting by duration instead of total number of requests, via the -d parameter (below we limit it to 15 seconds):

$ inquisitor -d 15s https://localhost:8080/test

Other useful option is -k for insecure connections, ignoring TLS certificates.

You can also do POST requests (with -b for the request body):

$ inquisitor -d 1m --method post -b "hello" https://localhost:8080/test

To set the request headers, you can use the -H option (once per header):

$ inquisitor -d 1m --method post -b "hello" \
-H "Content-Type:text/plain" -H "User-Agent:Inquisitor/8.0" \

For more useful options, type:

$ inquisitor --help

Here's an example output:

$ inquisitor -d 20s https://localhost:8080/test
total time: 20.0 s
errors: 0/651526
throughput: 32574 req./s
response times:
    mean	362 us
    st.dev	362 us
    min	    68 us
    max	    18.8 ms
    50%	    316 us
    75%	    522 us
    90%	    546 us
    95%	    571 us
    99%	    843 us
    99.9%	5.54 ms


There are some other tools in this category in Rust, such as Goose and Drill. Inquisitor is inspired more by tools such as wrk and siege than Goose, Drill or k6, which means that we want our tool to be:

  • efficient: capable of generating as many requests per second (RPS) as the hardware allows;
  • simple: we are not trying to be feature complete;
  • no scripting: for this you should look into the excellent k6 or some of the other tools mentioned.

From the tools that I have tried, by far the one capable of generating the highest number of RPS is wrk, which in my hardware will do something around 30-70k RPS. These numbers are significantly larger than the RPS of some of the tools I mentioned, and orders of magnitude higher than some others. This is the main motivation of Inquisitor: reach the level of RPS of wrk, while being written in Rust and if possible slowly add features that the comunity deems to be useful.


We will follow semantic versioning. Before 1.0, we will bump the MINOR number when there are breaking changes in the UI/CLI (e.g. change or removal of CLI options, change in the output format). For new features that don't alter the program's behavior while using the previously existing CLI options (e.g. addition of a new CLI option that don't change the program's behavior when not used), and minor patches, we will just bump the PATCH number.


~348K SLoC