Evaluating performance
Fill in the following worksheet to help you evaluate the performance of your program. If you answer yes to each question, you are probably improving the performance.
About this task
In thinking about the performance tradeoff, be sure you understand the function of each option as well as the performance advantages and disadvantages. You might prefer function over increased performance in many instances.
| Compiler option | Consideration | Yes? |
|---|---|---|
ARCH |
Do you use the highest architecture
level possible for all environments in which your programs will run?
For example, if the lowest level architecture you have including
your disaster recovery machines is z10, are you using ARCH(8)? |
|
AWO |
Do you use the AWO option when
possible? |
|
BLOCK0 |
Do you use BLOCK0 for
QSAM files? |
|
DATA |
When you use QSAM striped data sets, do you use
the RENT and DATA(31) options?
Is the program object AMODE 31?
Are you running with ALL31(ON)? |
|
DYNAM |
Can you use NODYNAM? Consider
the performance tradeoffs. |
|
FASTSRT |
When you use direct work files for the sort work
files, did you use the FASTSRT option? |
|
INLINE |
Do you use INLINE when
possible? |
|
INVDATA |
Do you use INVDATA when possible? |
|
NUMCHECK |
Do you use NONUMCHECK for
production runs? |
|
NUMPROC |
Do you use NUMPROC(PFD) when
possible? |
|
OPTIMIZE |
Do you use a non-zero OPTIMIZE level
for production runs? |
|
PARMCHECK |
Do you use NOPARMCHECK for
production runs? |
|
SSRANGE |
Do you use NOSSRANGE for production
runs? |
|
TEST |
Do you use NOTEST or TEST(NOEJPD) for production
runs? |
|
TRUNC |
Do you use TRUNC(OPT) when possible? |