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The PUB-Library (Paderborn University BSP-Library)
is a C-library of communication routines.
These routines allow implementing algorithms which are designed
for the BSP model (bulk synchrounus parallel model).
The BSP model divides algorithms into several parts called supersteps.
In each superstep a processor can work on local data and send messages.
At the end of the superstep a barrier synchronization takes place and
all processors receive the messages which were sent in the previous
superstep.
Further informations concerning the BSP model can be received from
[Val90].
PUB offers functions for both message passing and remote memory access.
Furthermore, some collective communication operations like broadcast and
parallel prefix are also provided.
To become more flexible, PUB allows creating independent BSP objects
each representing a virtual BSP computer.
Goudreau et al.[GHL$^+$96] defined an interface for BSP libraries call
``BSP Worldwide Standard'' which is
implemented in the Oxford BSP toolset[HDM97].
You can also use the BSP Worldwide Standard for programming with PUB
(refer to Section 1.6).
A performance comparison with other communication libraries and
some implementation details can be found in [BJOR99].
The PUB-Library is available for several parallel platforms. The generated library
is specified by four configuration variables PUB_MACHINE (machine type),
PUB_SYSTEM (operating system), PUB_COMMUNICATION (communication library) and
PUB_MODE (e.g. debug). See table 1 for supported systems.
Table:
possible configurations for the PUB-Library
| PUB_MACHINE |
description |
| cc, gcel, gcpp |
Parsytec parallel computer |
| crayt3e |
Cray T3E |
| ibmsp2 |
IBM SP/2 parallel computer |
| pc |
PC with x86 |
| psc |
PC cluster with SCI |
| sun |
Sun workstation, Sparc cpu |
| |
|
| PUB_SYSTEM |
description |
| aix |
IBM AIX |
| cygwin |
Windows, Cygnus gcc |
| linux |
Linux 2.x |
| nk |
Parsytec Nanokernel |
| parix |
Parsytec Parix |
| solaris |
Sun Solaris |
| unicos |
Cray Unicos |
| |
|
| PUB_COMMUNICATION |
description |
| seq |
one processor |
| mpi |
MPI |
| tcpip |
TCP/IP network |
| tcpipmig |
TCP/IP network with |
| |
migration of virtual p. |
| parix |
Parsytec Parix |
| shmem |
Cray SHMEM library |
| |
System V IPC |
| yasmin |
SCI library |
| |
|
| PUB_MODE |
description |
| release |
fastest version |
| debug |
additional debug code |
| profile |
generates profiling |
| |
information |
| |
|
|
The configure script tries to identify the machine and the operationg system and
asks for each possible communication/mode when a library is built.
You can install several versions of PUB. Choose the one you want by setting
environment variables before the call of pubcc (see section 1.2 for details).
PUB also contains support for virtual processors to run parallel programs
for easy debugging on simple workstations (or PCs) with one of the systems above
or Windows 32.
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