marylou4On 7 May 2007, the new scheduler policies were implemented on marylou4. Please review these policy changes outlined here. If you have questions, contact the Support Staff. Overviewmarylou4 is a Linux cluster consisting of 630 nodes (Dell PowerEdge 1955's). Each node is equipped with two Dual-core Intel Xeon EM64T processors (2.6GHz) and 8 GB of memory. 210 of the nodes are connected with Infiniband, a high-speed, low-latency copper interconnect. EnvironmentEach marylou4 node runs its own Linux kernel (Red Hat Enterprise Linux 4) and is equipped with standard Linux utilities and applications. The Ethernet version of MPICH provides message-passing interface (MPI) across all the nodes. A special version of MPI, MVAPICH, runs on the Infiniband nodes. Serial execution is supported in addition to MPI code. Accessmarylou4 is accessed exclusively using the SSH (version 2) protocol. This applies to both interactive shell access and external file transfer (using the SSH scp and sftp utilities). SSH clients are available for nearly all computing platforms. Windows versions of the client can be downloaded from The PuTTY download page and a graphical file transfer tool can be found at winscp.com. The address to use for SSH connections is marylou4.byu.edu. The system is available from both on- and off-campus. Batch JobsAll processes run on the marylou4 compute nodes are managed by a job scheduling system. marylou4 uses the PBS/Torque resource manager with the Moab scheduler. When you connect to marylou4.byu.edu you are actually logged into one of several marylou4 interactive nodes. You can use the interactive node to submit batch jobs, compile and test your programs, and manage your home directory space. When you submit a job, the job is dispatched to processors on compute nodes. Interactive logins on compute nodes are only permitted when the user is actively running a job on the node(s). Use the Quick Links on the left column of this page for PBS Batch information and tutorials. Help ResourcesThe first place to look for assistance with marylou4 is the marylou4 FAQ. If you cannot find the answer to your question there, feel free to contact the system administrators or open a support ticket. |
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