Normally each user is assigned two directories.
For example, my home directory is /fs/meiko-user/tyang
in which I edit and compile the code,
another directory is /export/tmphome/tyang where I run the program.
The files under /fs/meiko-user are backed up every few
days. But the files under /export/tmphome are not backed
up.
The Meiko parallel nodes can only access /export/tmphome thus
the binary code has to be executed under that directory.
Your own exeuction directory is linked to 
/Mtmp.