#### `test-lz4-speed.py` - script for testing lz4 speed difference between commits
This script creates `speedTest` directory to which lz4 repository is cloned.
Then it compiles all branches of lz4 and performs a speed benchmark for a given list of files (the `testFileNames` parameter).
After `sleepTime` (an optional parameter, default 300 seconds) seconds the script checks repository for new commits.
If a new commit is found it is compiled and a speed benchmark for this commit is performed.
The results of the speed benchmark are compared to the previous results.
If compression or decompression speed for one of lz4 levels is lower than `lowerLimit` (an optional parameter, default 0.98) the speed benchmark is restarted.
If second results are also lower than `lowerLimit` the warning e-mail is send to recipients from the list (the `emails` parameter).
Additional remarks:
- To be sure that speed results are accurate the script should be run on a "stable" target system with no other jobs running in parallel
- Using the script with virtual machines can lead to large variations of speed results
- The speed benchmark is not performed until computers' load average is lower than `maxLoadAvg` (an optional parameter, default 0.75)
- The script sends e-mails using `mutt`; if `mutt` is not available it sends e-mails without attachments using `mail`; if both are not available it only prints a warning
The example usage with two test files, one e-mail address, and with an additional message:
```
./test-lz4-speed.py "silesia.tar calgary.tar" "email@gmail.com" --message "tested on my laptop" --sleepTime 60
```
To run the script in background please use:
```
nohup ./test-lz4-speed.py testFileNames emails &
```
The full list of parameters:
```
positional arguments:
testFileNames file names list for speed benchmark
emails list of e-mail addresses to send warnings
optional arguments:
-h, --help show this help message and exit
--message MESSAGE attach an additional message to e-mail
