P
parallel application
An application that u ses a distributed programming model and can run on multiple processors.
An HP XC MPI a p plication is a par allel application. That is, all interprocessor communicatio n
within an HP XC parallel application is performed through calls to the MPI message passing
library.
PXE
Preboot Execution Environment. A standard client/server interface that allows networked
computers that are not yet installed with an operating system to be config ured and booted
remotely. PXE booting is configured at the BIOS level.
R
resource manager role
Nodes with this role manage the allocation of r esources to user applications.
role
A set of services that are assigned to a node.
Root Administration Switch
A com ponent of the administrative network . The top switch in the Administrative Network; it
may be a logical network switch comprised of multiple hardware switches. The Root Console
Switch is connected to the Root Administration Switch.
root node
A server within the XC system that is connected directly to the Root Administration Switch.
RPM
Red Hat Package Manager.
1. A utility th at is used for software package management on a Linux operating system, most
notably to install and remove software packages.
2. A software package that is capable of being installed or removed with the RPM software
package management utility.
S
serial application
A command or user program that does not use any distributed shared-memory form of
parallelism. A serial application is basically a single-processor application that has no
communication l ibrary calls (for example, MPI, PVM, GM, or Portals).
An example of a serial application is a standard Linux command, such as the ls command.
Another example of a serial application is a program that has b een built on a Linux system
that is binary compatible with the HP XC environment, but does not contain any of the HP
XC infrastructure libraries.
SMP
Symmetr ic multiprocessing. A system with two or more CPUs that share equal (symmetric)
access to all of the facilities of a computer system, such as the memory and I/O subsystems.
In an HP XC system, the use of SM P technology increases the number of CPUs (amount of
computational power) available per unit of space.
ssh
Secure Shell. A shell p rogram for logging in to and executing com m ands on a remote computer.
It can provide secure encrypted communications between two untrusted hosts over an insecure
network.
Glossary-5
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