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docs: improve performance metrics documentation

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Add a performance metrics list and the definition of output format.

Signed-off-by: Songqian Li <sionli@tencent.com>
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Songqian Li 2024-07-15 20:29:50 +08:00 committed by Bo Chen
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@ -8,6 +8,8 @@ e.g. `dev_cli.sh`. The only prerequisite is [Docker installation](https://docs.d
Please note that upon its first invocation, this script will pull a
fairly large container image.
## Run the Performance Tests
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:
@ -27,3 +29,83 @@ 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
```
To set custom timeout or test iterations for all performance tests:
```
$ ./scripts/dev_cli.sh tests --metrics -- -- --timeout 5 --iterations 10
```
## Performance Tests Details
The following table lists the supported performance tests with default timeout and number of iterations.
The `timeout` defines the maximum execution time of each test for each iteration.
The `iteration` defines how many times a test needs to be executed to generate the final metrics data.
| **Type** | **Metric** | **Timeout(s)** | **Iterations** |
|------------|--------------------------------------------|----------------|----------------|
| Boot Time | boot_time_ms | 2 | 10 |
| | boot_time_pmem_ms | 2 | 10 |
| | boot_time_16_vcpus_ms | 2 | 10 |
| | boot_time_16_vcpus_pmem_ms | 2 | 10 |
| Virtio Net | virtio_net_latency_us | 10 | 5 |
| | virtio_net_throughput_single_queue_rx_gbps | 10 | 5 |
| | virtio_net_throughput_single_queue_tx_gbps | 10 | 5 |
| | virtio_net_throughput_multi_queue_rx_gbps | 10 | 5 |
| | virtio_net_throughput_multi_queue_tx_gbps | 10 | 5 |
| Block | block_read_MiBps | 10 | 5 |
| | block_write_MiBps | 10 | 5 |
| | block_random_read_MiBps | 10 | 5 |
| | block_random_write_MiBps | 10 | 5 |
| | block_multi_queue_read_MiBps | 10 | 5 |
| | block_multi_queue_write_MiBps | 10 | 5 |
| | block_multi_queue_random_read_MiBps | 10 | 5 |
| | block_multi_queue_random_write_MiBps | 10 | 5 |
| | block_read_IOPS | 10 | 5 |
| | block_write_IOPS | 10 | 5 |
| | block_random_read_IOPS | 10 | 5 |
| | block_random_write_IOPS | 10 | 5 |
| | block_multi_queue_read_IOPS | 10 | 5 |
| | block_multi_queue_write_IOPS | 10 | 5 |
| | block_multi_queue_random_read_IOPS | 10 | 5 |
| | block_multi_queue_random_write_IOPS | 10 | 5 |
## Output Format
Performance-metrics output the result into a json file if `report-file` param is set.
The fields included in JSON include:
| Field Name | Content |
|--------------------|------------------------------------------|
| git_human_readable | Recent tag information of git repository |
| git_revision | Commit id of HEAD |
| git_commit_date | Commit date of HEAD |
| date | Date for executing the program |
| results | A list of metrics |
A sample example is below.
```json
{
"git_human_readable": "v38.0-421-gc67f7997-dirty",
"git_revision": "c67f799717f99efc0a798683520278da25d5f8b9",
"git_commit_date": "Fri Jul 12 00:02:26 2024 +0000",
"date": "Mon Jul 15 17:33:19 CST 2024",
"results": [
{
"name": "boot_time_ms",
"mean": xxx,
"std_dev": xxx,
"max": xxx,
"min": xxx
},
{
"name": "block_multi_queue_read_MiBps",
"mean": xxx,
"std_dev": xxx,
"max": xxx,
"min": xxx
},
...
]
}
```