Jenkinsfile: run each py.test on a separate executor Running all py.test processes in parallel on the same executor is not a good idea. If a node has not much RAM, it could run out of memory when all py.test processes run at the same time. And If there are only 2 CPU cores, it doesn't make sense to run more then 2 processes either. Therefore use a separate executor for each one. The py.test processes will thus only run in parallel if there are multiple Jenkins executors available.

[tox]
minversion = 1.8
envlist = py{26,27}-pytest

[testenv]
setenv =
    PYTHONHASHSEED = 0
deps =
    -r{toxinidir}/dev_requirements.txt
    py26-pytest: unittest2
    python-ldap
    python-pam
commands =
    pytest: py.test {posargs}