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Scrathbook

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Cluster Management

In reply to Scrathbook

• Error message:
         p4_error: semget failed for setnum: 0
  This means that the maximum number of allowed semaphores on the
  master node has been created, and the program you are trying to run
  cannot allocate a new semaphore for inter-process communication. This
  can happen when somebody has been testing software that does not exit
  properly, leaving semaphores and shared memory segments allocated.
  If the leftover semaphores are owned by you, it can be fixed by running the following two commands:
  Run on each machine:    /opt/mpich/gnu/sbin/cleanipcs
  Run on the cluster root:  cluster-fork /opt/mpich/gnu/sbin/cleanipcs

Linux Tips

In reply to Scrathbook

!! – This will execute the last command from history file.
!<char> – This will execute the last command from history, starting with <char>

Linux Administration

In reply to Scrathbook

• du -Lk <path>: This will give the disk usage statistics for the path.
• 
  rpm -i mpi*rpm: This will install the given RPM file.
• 
  /etc/init.d/iptables status: This will give the status of the iptables in the system.
• 
  /opt/rocks/sbin/create-account -c “Asif Rahaman ” -d /export/home/weland/rahaman -g 380 -s /bin/bash -u 24855 rahaman: Create an account in Rocks for user Asif Rahaman and given directory.
• cluster-fork <cmd>: Runs the command in every system on the cluster.
• 
  diff <file1> <file2>: Finds and lists the difference between the files.
• scp chaffin@antaeus.hpcc.ttu.edu:/home/chaffin/bash-test .: Secure Copy from one remote location to another.
• find . -name “chaffin” -print: Used to find the file with name chaffin.
• rsync –archive –rsh=/usr/bin/ssh ./post hrothgar.hpcc.ttu.edu:/home/chaffin/post: Move the archive post to another system hrothgar.

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