Have you ever been attacked by a goose?
Goose is a Rust load testing tool based on Locust. User behavior is defined with standard Rust code.
Goose load tests are built using Cargo to build a new application with a dependency on the Goose library.
Passing the included simple example the -h flag you can see the
run-time configuration options available to Goose load tests:
``
$ cargo run --release --example simple -- -h
Finished release [optimized] target(s) in 0.05s
Runningtarget/release/examples/simple -h`
client 0.4.0
Configuration options required for launching a Goose loadtest
USAGE: simple [FLAGS] [OPTIONS]
FLAGS: -h, --help Prints help information -l, --list Shows list of all possible Goose tasks and exits -g, --log-level Log level (-g, -gg, -ggg, etc.) --only-summary Only prints summary stats --print-stats Prints stats in the console --reset-stats Resets statistics once hatching has been completed --status-codes Includes status code counts in console stats -V, --version Prints version information -v, --verbose Debug level (-v, -vv, -vvv, etc.)
OPTIONS:
-c, --clients
The examples/simple.rs example copies the simple load test documented on the locust.io web page, rewritten in Rust for Goose. It uses minimal advanced functionality, but demonstrates how to GET and POST pages. It defines a single Task Set which has the client log in and then load a couple of pages.
Goose can make use of all available CPU cores. By default, it will launch 1 client per core, and it can be configured to launch many more. The following was configured instead to launch 1,024 clients. Each client randomly pauses 5 to 15 seconds after each task is loaded, so it's possible to spin up a large number of clients. Here is a snapshot of top when running this example on an 8-core VM with 10G of available RAM -- there were ample resources to launch considerably more "clients", though ulimit had to be resized:
``` top - 11:14:57 up 16 days, 4:40, 2 users, load average: 0.00, 0.04, 0.01 Tasks: 129 total, 1 running, 128 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.3 us, 0.3 sy, 0.0 ni, 99.2 id, 0.0 wa, 0.0 hi, 0.2 si, 0.0 st MiB Mem : 9993.6 total, 6695.1 free, 1269.3 used, 2029.2 buff/cache MiB Swap: 10237.0 total, 10234.7 free, 2.3 used. 8401.5 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
19776 goose 20 0 9.8g 874688 8252 S 6.3 8.5 0:42.90 simple
```
Here's the output of running the loadtest. The -v flag sends INFO and more critical messages to stdout (in addition to the log file). The -c1024 tells Goose to spin up 1,024 clients. The -r32 option tells Goose to spin up 32 clients per second. The -t 10m option tells Goose to run the load test for 10 minutes, or 600 seconds. The --print-stats flag tells Goose to collect statistics during the load test, and the --status-codes flag tells it to include statistics about HTTP Status codes returned by the server. Finally, the --only-summary flag tells Goose to only display the statistics when the load test finishes, otherwise it would display running statistics every 15 seconds for the duration of the test.
``
$ cargo run --release --example simple -- --host http://apache.fosciana -v -c1024 -r32 -t 10m --print-stats --status-codes --only-summary
Finished release [optimized] target(s) in 0.05s
Runningtarget/release/examples/simple --host 'http://apache.fosciana' -v -c1024 -r32 -t 10m --print-stats --status-codes --only-summary`
18:42:48 [ INFO] Output verbosity level: INFO
18:42:48 [ INFO] Logfile verbosity level: INFO
18:42:48 [ INFO] Writing to log file: goose.log
18:42:48 [ INFO] run_time = 600
18:42:48 [ INFO] global host configured: http://apache.fosciana
18:42:53 [ INFO] launching client 1 from WebsiteUser...
18:42:53 [ INFO] launching client 2 from WebsiteUser...
18:42:53 [ INFO] launching client 3 from WebsiteUser...
18:42:53 [ INFO] launching client 4 from WebsiteUser...
18:42:53 [ INFO] launching client 5 from WebsiteUser...
18:42:53 [ INFO] launching client 6 from WebsiteUser...
18:42:53 [ INFO] launching client 7 from WebsiteUser...
18:42:53 [ INFO] launching client 8 from WebsiteUser...
...
18:43:25 [ INFO] launching client 1022 from WebsiteUser...
18:43:25 [ INFO] launching client 1023 from WebsiteUser...
18:43:25 [ INFO] launching client 1024 from WebsiteUser...
18:43:25 [ INFO] launched 1024 clients...
18:53:26 [ INFO] stopping after 600 seconds...
Name | # reqs | # fails | req/s | fail/s
GET / | 34,077 | 582 (1.7%) | 53 | 0
GET /about/ | 34,044 | 610 (1.8%) | 53 | 0
POST /login | 1,024 | 0 (0%) | 1 | 0
------------------------+----------------+----------------+-------+----------
Name | Avg (ms) | Min | Max | Mean
GET / | 12.38 | 0.01 | 1001.10 | 0.09
GET /about/ | 12.80 | 0.01 | 1001.10 | 0.08
POST /login | 0.21 | 0.15 | 1.82 | 0.20
------------------------+------------+------------+------------+-------------
Slowest page load within specified percentile of requests (in ms):
Name | 50% | 75% | 98% | 99% | 99.9% | 99.99%
GET / | 0.09 | 0.10 | 345.18 | 500.60 | 1000.93 | 1001.09 GET /about/ | 0.08 | 0.10 | 356.65 | 500.61 | 1000.94 | 1001.08 POST /login | 0.20 | 0.22 | 0.27 | 0.34 | 1.36 | 1.82 ------------------------+------------+------------+------------+-------------
Name | Status codes
GET / | 33,495 [200], 582 [0]
GET /about/ | 33,434 [200], 610 [0]
Aggregated | 67,953 [200]
```
The Goose project roadmap is documented in TODO.md.