Rational Developer for System z
Enterprise COBOL for z/OS, Version 4.1, Programming Guide


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.

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.

Table 1. Performance-tuning worksheet
Compiler option Consideration Yes?
AWO Do you use the AWO option when possible?  
DATA When you use QSAM striped data sets, do you use the RENT and DATA(31) options? Is the load module 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?  
NUMPROC Do you use NUMPROC(PFD) when possible?  
OPTIMIZE Do you use OPTIMIZE for production runs? Can you use OPTIMIZE(FULL)?  
RENT Consider the performance tradeoffs of RENT versus NORENT.  
RMODE(ANY) Do you use RMODE(ANY) with your NORENT programs? Consider the performance tradeoffs with storage usage.  
SSRANGE Do you use NOSSRANGE for production runs?  
TEST Do you use NOTEST, TEST(NOHOOK), or TEST(NOHOOK,SEP) for production runs?  
TRUNC Do you use TRUNC(OPT) when possible?  

related concepts  
Storage and its addressability

related references  
Performance-related compiler options


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