python-gevent package required for running server.
Under Ubuntu:
apt-get install python-geventUnder Ubuntu using virtualenv:
sudo apt-get install python-virtualenv python-dev libev-dev
cd /path/to/latency/
virtualenv .env
source .env/bin/activate
pip install geventUnder MacOs using virtualenv:
brew install libev python
cd /path/to/latency/
virtualenv .env
source .env/bin/activate
pip install gevent./latency.py
or
./latency.py --help for help