System for monitoring computer system performance

A computer implemented method for modifying a program module produced by a translator in the form an intermediate machine readable language having instructions independent of computer hardware architecture into machine dependent executable instructions to be carried out in a computer system comprising:

• partitioning the linked code module into basic program components;
• tracing an execution flow through the basic program components using navigational routines to deduce structural and flow information;
• locating program components to be monitored during the tracing step using the deduced structural information;
• and
• inserting a call instruction in the located program component to be monitored, the call instruction for transferring execution control to a user analysis routine to monitor the program component to be monitored during execution of the program component in the computer system, wherein the user analysis routine does not share procedures or data with the program module.

A method of modifying a computer program formed of machine dependent executable instructions, comprising the steps of:

• translating the machine dependent executable instructions into a program module in an intermediate language;
• partitioning the program module into a plurality of basic program components;
• tracing an execution flow through the plurality of basic program components using navigational routines;
• while tracing the execution flow through the plurality of basic program components, modifying the plurality of basic program components by inserting a call instruction to transfer execution control to a user analysis routine when a specific program component is executed in the computer system, wherein the user analysis routine does not share procedures or data with the program module;
• and
• generating instrumented machine dependent executable code from the modified plurality of basic program components after inserting the call instruction.

A method of modifying a computer program formed of machine dependent executable code, comprising the steps of:

• translating the machine dependent executable code into machine independent executable code;
• inserting a call instruction referencing a user analysis routine into the machine independent executable code, wherein the user analysis routine does not share procedures or data with the program module;
• and
• generating modified machine dependent executable code from the machine independent executable code which includes the call instruction.