Kbase 19899: Relationship Between Progress/400 DataServer, CPW, and RPR
| Autor |
Progress Software Corporation - Progress |
| Acesso |
Público |
| Publicação |
10/16/2008 |
|
SUMMARY:
This solution describes the difference between CPW and RPR, and provides the minimum recommended configuration that the Progress/400 DataServer requires for the processor.
EXPLANATION:
When the IBM AS/400 was announced in 1988, the Relative Performance Rating (RPR) or Relative System Performance (RSP) of different models was measured using a RAMP-C workload. This workload is representative of general commercial processing. RPR figures for OS/400 models have
been expressed relative to the 9404 Model B10, which was the initial entry model for the OS/400 range in 1988 which had a RPR rating of 1.0.
The AS/400 product line continues to increase in power with the PowerPC RISC processors and 12-way processors. With this increased processing power and with more applications using vital technologies (such as Web serving, client/server, object-oriented, and multimedia), the point was reached when RAMP-C was no longer a valid means of measuring relative performance. Therefore, in the second half of 1996, RAMP-C was replaced by a workload called Commercial Processing Workload (CPW).
Relative system performance measurements (CPW values) are based on
AS/400 environment, Commercial Processing Workload (CPW). The CPW
workload is representative of commercial applications, particularly
those that do significant database processing in conjunction with
journaling and commitment control. The CPW workload is measured on
maximum configurations.
CPW contains a number of advantages over RAMP-C for measuring the
AS/400, such as:
-Inclusion of a batch component.
-Increased numbers of transaction types.
-Support for journaling and commitment control.
-Increased path lengths.
-More complex file and terminal I/O.
CPW figures give a relative performance rating of all AS/400 processors. The figures are not based relative to a single model
(as was RAMP-C and the 9404 Model B10 with a value of 1.0). For
processors introduced after August, 1997, only CPW values are
issued and no RAMP-C figures are provided.
SOLUTION:
The CPW minimum processor recommended configuration for the
Progress/400 DataServer Version 8.x with a relative performance (R/P) rating of 3.4.
CPW values have been calculated for all previous AS/400 models,
however CPW values may not be realized in all environments. There is some confusion due to the fact that the Progress/400 DataServer Version 8.x installation notes show an R/P rating of 3.4 can be installed on AS/400 systems that are measured by CPW and do not have
an equivalent RAMP-C rating.
In such cases, a CPW of 35.0 should be considered instead of a R/P rating of 3.4. Other Progress/400 DataServer versions require a CPW as follows:
- DataServer Version 9.x a CPW of at least 35.0
- Dataserver Version 9.1 a CPW of atleast 50.0
- AppServer Version 9.1 a CPW of at least 100.0
NOTE: CPW can be used as a quick means of comparing performance. However, a more detailed analysis should always be done using BEST/1** for OS/400, because the performance you see from AS/400 depends on
many factors. Some of these factors include the type and number of
disk devices, the number of workstation controllers, the amount of
memory, the system model and processor, the application being run, and
other factors.
Reference to Written Documentation:
-For a summary of all early OS/400 models that includes the CPW
figures as well as RAMP-C figures, see:
http://www.as400.ibm.com/handbook/5486MSum.html#45611
-For a summary of the PowerPC-based models 150, 170, 720, 730, 740,
and SB1, see "Summary of the AS/400e server 150":
http://www.as400.ibm.com/handbook/5486SSum.html#table1
-For a summary of the AS/400e server SB1, showing CPW figures for
all the processors, see:
http://www.as400.ibm.com/handbook/5486SSum.html#table6
Progress/400 DataServer Installation Notes, Version 8.x.
Progress/400 DataServer Installation Notes, Version 9.x.