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From real to virtual in three trivial steps

Preamble

Let’s suppose you are administering a GNU/Linux server where some complex tests and updates must be run on. Now, there are myriads of different ways – tools and techniques – that surely would allow you to do precisely that without affecting the real server – not to mention if you […]

Changing the STACKSIZE (ulimit -s) limit whenever running mpirun

Preamble

Today, some basic SysOp stuff. 😉

Sometimes, when the total amount of the stack size is not enough to run parallel jobs with OpenMPI, and there is no presence of a scheduler like SGE or Torque, it seems quite impossible to deal with the “ulimit -s” […]