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# DataLake Performance Tests
In order to run the performance tests, the `devtools_testutils` package must be installed. This is done as part of the `dev_requirements`.
Start be creating a new virtual environment for your perf tests. This will need to be a Python 3 environment, preferably >=3.7.
Note that there are no T1 tests for this project.
### Setup for test resources
These tests will run against a pre-configured Storage account. The following environment variable will need to be set for the tests to access the live resources:
```
AZURE_STORAGE_CONNECTION_STRING=<live storage account connection string>
```
### Setup for T2 perf test runs
```cmd
(env) ~/azure-storage-file-datalake> pip install -r dev_requirements.txt
(env) ~/azure-storage-file-datalake> pip install -e .
```
## Test commands
When `devtools_testutils` is installed, you will have access to the `perfstress` command line tool, which will scan the current module for runable perf tests. Only a specific test can be run at a time (i.e. there is no "run all" feature).
```cmd
(env) ~/azure-storage-file-datalake> cd tests
(env) ~/azure-storage-file-datalake/tests> perfstress
```
Using the `perfstress` command alone will list the available perf tests found.
### Common perf command line options
These options are available for all perf tests:
- `--duration=10` Number of seconds to run as many operations (the "run" function) as possible. Default is 10.
- `--iterations=1` Number of test iterations to run. Default is 1.
- `--parallel=1` Number of tests to run in parallel. Default is 1.
- `--no-client-share` Whether each parallel test instance should share a single client, or use their own. Default is False (sharing).
- `--warm-up=5` Number of seconds to spend warming up the connection before measuring begins. Default is 5.
- `--sync` Whether to run the tests in sync or async. Default is False (async).
- `--no-cleanup` Whether to keep newly created resources after test run. Default is False (resources will be deleted).
### Common DataLake command line options
The options are available for all SB perf tests:
- `--size=10240` Size in bytes of data to be transferred in upload or download tests. Default is 10240.
- `--max-concurrency=1` Number of threads to concurrently upload/download a single operation using the SDK API parameter. Default is 1.
### T2 Tests
The tests currently written for the T2 SDK:
- `UploadTest` Uploads a stream of `size` bytes to a new File.
- `UploadFromFileTest` Uploads a local file of `size` bytes to a new File.
- `DownloadTest` Download a stream of `size` bytes.
- `AppendTest` Append `size` bytes to an existing file.
## Example command
```cmd
(env) ~/azure-storage-file-datalake/tests> perfstress UploadTest --parallel=2 --size=10240
```
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