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# Gitaly Benchmarking Tool
## What is this?
An Ansible script for running RPC-level benchmarks against Gitaly.
Currently five open source repositories are used:
- Git
- GitLab
- Linux
- Homebrew-Core
- Chromium
Requests are sent to Gitaly via [ghz](https://ghz.sh/), a gRPC benchmarking
tool. The details of the requests can be found in
`roles/client/files/queries/<RPC_NAME>/<REPO_NAME>`.
## Steps for use
### 1. Create instance
```
./create-benchmark-instance
```
This will create a Gitaly node and a small client node to
send requests to Gitaly over gRPC. This will ask for the Gitaly revision that
will be built.
### 2. Configure instance
```
./configure-benchmark-instance
```
Install Gitaly from source with from desired reference and install other
required tools. A disk image containing the test repositories will be mounted
to `/mnt/git-repositories` on the Gitaly node.
### 3. Run benchmarks
```
./run-benchmarks
```
Run all RPCs against all repos listed in the `rpc` and `repos` section of
`group_vars/all.yml`. By default the Gitaly node is profiled with `perf` and
several `libbpf-tools` binaries for generating flamegraphs and other
performance information. Profiling adds ~10% overhead, and can be disabled by
running the job with:
```
./run-benchmarks --extra-vars "profile=false"
```
The output of the job will be written to an archive titled
`benchmark-<GITALY_REV>-<EPOCH>.tar.gz` in the `results` directory.
### 4. Destroy instance
```
./destroy-benchmark-instance
```
All nodes will be destroyed.
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