Path integral mode can be run only in parallel using number of processors equal to the number of beads in the path integral representation of quantum particles. The number of beads should be even.
PIMD <num. of beads>
Use PIMD mode with the given number of beads
PI_thermo <temp> <tau> <chain>
Use Nose chain of thermostats for each atom. This is preferable option instead
of the common Nose thermostat for all atoms. <temp> is the target
temperature, <tau> is the relaxation time
for the thermostats and <chain> is the number of thermostats in each
chain. If this option is specified, Nose_thermostat option is ignored.