isCOBOL Evolve : Appendices : Performance Tuning : Guidelines for faster compilation : General advice
General advice
Writing a file on disk has a cost, so it’s important to reduce the number of files that the Compiler will generate. Review your Compiler options and configuration looking for the below items, and check if you really need them or if you can discard them:
Compiler options
-efa
-efd
Generate EFD dictionaries required by several tools and file handlers
-efc
Generate ISS dictionaries required by c-tree in order to link files to the SQL Engine
-ef
Generate error files that include the list of errors and warnings returned by the Compiler
-jj -jc
When used together, the intermediate Java source is left on disk
-ld
-lf
Generate list files that include the source code and all the copybooks
Compiler configurations / directives
iscobol.compiler.easydb=1
$SET “easydb” “1”
Generate bridge programs that allow to use COBOL I/O statements on a RDBMS
iscobol.compiler.easylinkage=1
$SET “easylinkage” “1”
Generate a bridge program that allows your COBOL program to be called from Java programs
iscobol.compiler.servicebridge=1
$SET “servicebridge” “1”
Generate bridge classes that allow your COBOL program to be called via WebService technology
EFD and ISS dictionaries as well as Database Bridge routines are generated for each FD found in the COBOL source. The same FD could be included in multiple programs, so the Compiler may regenerate the same dictionary and Database Bridge routine multiple times without reason. In order to avoid the regeneration of the same dictionary and Database Bridge routine it’s good practice to gather all your FDs in a dummy program and compile only this dummy program with the options and configurations that make the Compiler generate dictionaries and Database Bridge routines.