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docs: Add a documentation for performance metrics

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Signed-off-by: Bo Chen <chen.bo@intel.com>
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Bo Chen 2022-03-10 11:48:10 -08:00 committed by Rob Bradford
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# Performance Metrics
Cloud Hypervisor provides a [performance metrics](https://github.com/cloud-hypervisor/cloud-hypervisor/tree/main/performance-metrics)
binary for users to generate metrics data from their own
environment. This document describes how to generate metrics data
quickly by using Cloud Hypervisor's development script,
e.g. `dev_cli.sh`. The only prerequisite is [Docker installation](https://docs.docker.com/engine/install/).
Please note that upon its first invocation, this script will pull a
fairly large container image.
To generate metrics data for all available performance tests (including
boot time, block I/O throughput, and network throughput & latency) and
output the result into a json file:
```
$ ./scripts/dev_cli.sh tests --metrics -- -- --report-file /tmp/metrics.json
```
To get a list of available performance tests:
```
$ ./scripts/dev_cli.sh tests --metrics -- -- --list-tests
```
To generate metrics data for selected performance tests, e.g. boot time only:
```
$ ./scripts/dev_cli.sh tests --metrics -- -- --report-file /tmp/metrics.json --test-filter boot_time
```