ILBOMVO
ILBOMVO is the COBOL subroutine called when one or both operands are variable in length or longer than 4096 bytes. Variable-length operands may exceed 256 bytes.
Hints
If high CPU usage is reported to this routine, see if you can redefine variable length items as fixed length. The attribution reports will show the location in your program from where the variable length move is called.
Reference Sources
IBM OS/VS COBOL Subroutine Library Program Logic, LY28-6425.