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E – Glossary
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MTRR For Memory Type Range Registers. MTRR For
"Memory Type Range Registers". Used by the
InfiniPath driver to enable write combining to the
InfiniPath on-chip transmit buffers. This improves write
bandwidth to the InfiniPath chip, by writing multiple
words in a single bus transaction (typically 64). Applies
only to x86_64 systems.
MTU For Maximum Transfer Unit. The largest packet size
that can be transmitted over a given network.
multicast group A mechanism that a group of nodes use to
communicate amongst either other. It is an efficient
mechanism for broadcasting messages to many nodes,
as messages sent to the group are received by all
members of the group without the sender having to
explicitly send it to each individual member (or even
having to know who the members are.) Nodes can join
or leave the group at any time.
node file Same as hostsfile.
node program Each individual process that is part of the parallel MPI
job. The machine on which it is executed is called a
node.
OpenIB The previous name of OpenFabrics.
OpenFabrics The open source InfiniBand protocol stack.
OpenMP Specification that provides an open source model for
parallel programming that is portable across shared
memory architectures from different vendors.
OpenSM Open source SM (Subnet Manager) that provides basic
functionality for subnet discovery and activation.
PCIe For PCI Express. Based on PCI concepts and
standards, PCIe uses a faster serial connection
mechanism.
RDMA For Remote Direct Memory Access. A communications
protocol that enables data transmission from the
memory of one computer to the memory of another
without involving the CPU. The most common form of
RDMA is over InfiniBand.
RPM For Red Hat Package Manager. A tool for packaging,
installing, and managing software for Linux
distributions.