Specifies the number of processors that the thread-enabled applications
should assume will be available for concurrent processing.
| Valid in: |
configuration file, SAS invocation, OPTIONS
statement, SAS System Options window
|
| Category: |
System administration: Performance
|
| PROC OPTIONS GROUP= |
PERFORMANCE
|
| Default: |
Under Windows, OpenVMS, and z/OS, the default
is ACTUAL. Under UNIX, the default is either ACTUAL or 4 for systems that
have more than four processors.
|
| Interaction: |
If the THREADS system option is set to NOTHREADS,
the CPUCOUNT= option has no effect.
|
|
CPUCOUNT= 1 - 1024 | ACTUAL
|
-
1-1024
-
is the number of CPUs that SAS will assume
are available for use by thread-enabled applications.
| Tip: |
The value is typically set
to the actual number of CPUs available to the current process by your configuration. |
| Tip: |
Setting CPUCOUNT= to a number greater than
the actual number of available CPUs might result in reduced overall performance
of SAS. |
-
ACTUAL
-
returns the number of physical processors
that are associated with the operating system where SAS is executing. If the
operating system is executing in a partition, the value of the CPUCOUNT system
is the number of physical processors that are associated with the operating
system in that partition.
| Tip: |
This number can be less
than the physical number of CPUs if the SAS process has been restricted by
system administration tools. |
| Tip: |
Setting CPUCOUNT= to ACTUAL
at any time causes the option to be reset to the number of physical processors
that are associated with the operating system at that time. If the operating
system is executing in a partition, the value of the CPUCOUNT system is the
number of physical processors that are associated with the operating system
in that partition. |
| Tip: |
If your system supports Simultaneous Multi-Threading
(SMT), hyperthreading, or Chip Multi-Threading (CMT), the value of the CPUCOUNT=
option represents the number of such threads on the system. |
Certain procedures have been modified
to take advantage of multiple CPUs by threading the procedure processing.
The Base SAS engine also uses threading to create an index. The CPUCOUNT=
option provides the information that is needed to make decisions about the
allocation of threads.
Changing the value of CPUCOUNT= affects the degree of
parallelism each thread-enabled process attempts to achieve. Setting CPUCOUNT
to a number greater than the actual number of available CPUs might result
in reduced overall performance of SAS.
When the related system option THREADS
is in effect, threading will be active where available. The value of the CPUCOUNT=
option affects the performance of THREADS by suggesting how many system CPUs
are available for use by thread-enabled SAS procedures.
Copyright © 2011 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
