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E – Glossary
IB6054601-00 D E-3
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LID For Local Identifier. Assigned by the Subnet Manager
(SM) to each visible node within a single InfiniBand
fabric. It is similar conceptually to an IP address for
TCP/IP.
Lustre Open source project to develop scalable cluster file
systems.
MAC Address For Media Access Control Address. It is a unique
identifier attached to most forms of networking
equipment.
machines file Same as mpihostsfile.
MADs For Management Datagrams. Subnet Managers (SMs)
and Subnet Management Agents (SMAs)
communicate via MADs.
managed switch A switch that can be configured to run an embedded
Subnet Manager (SM).
MGID For Multicast Group ID. An identifier for a multicast
group. This can be assigned by the SM at multicast
group creation time, although frequently it is chosen by
the application or protocol instead.
MLID For Multicast Local ID for InfiniBand multicast. This is
the identifier a member of a multicast group uses for
addressing messages to other members of the group.
MPD For Multi-Purpose Daemon. An alternative to mpirun
to launch MPI jobs, providing support for MPICH.
Developed at Argonne National laboratory.
MPI For Message-Passing Interface. MPI is a
message-passing library or collection of routines used
in distributed-memory parallel programming. It is used
in data exchange and task synchronization between
processes. The goal of MPI is to provide portability and
efficient implementation across different platforms and
architectures.
MPICH A freely available, portable implementation of MPI.
mpihosts file A file containing a list of the hostnames of the nodes in
a cluster on which node programs may be run. Also
referred to as node file, hosts file, or machine(s) file.