SLACMON and SLACMON/370 operating as systems' tasks or jobs under OS/VS2, are designed to monitor hardware and software performance over a given period of time. Input specified in the parameter field on the execute card coupled with the corresponding operand in the operator's start command allows selected functions to be performed. Five data sets optionally provide names of queues, I/O devices, or modules that the programs monitor. Output consists of a number of reports followed by a summary page; certain summary data may appear on the console device. The output is most useful for identifying bottlenecks and interactions, tuning a system for peak performance and for indicating desirable hardware and software reconfiguration.IBM360,370; Assembly language; OS/360 MVT or MFT (SLACMON), OS/370 VS2 Release 1.6 (SLACMON/370).