Abstract: The present invention describes a system and process for measuring the performance of programs by means of messages, in particular with distributed programs. A corresponding area for performance and/or time entries is added to the message which is to be processed. At each processing stage of the message, a performance and/or time marker is deposited in this area. The performance and/or time marker consists essentially of the identifier of the computer, the identifier of the particular processing stage, a description of the particular processing stage, and performance data and/or a value of the computer time. All the performance and time markers are written into a file for later evaluation, so that data is available at the same time. Thanks to the integrated processing of performance data with application data, the performance analysis, e.g. of response times of definable processing procedures, in particular with distributed networks, is considerably simplified.

Abstract: A system and method for controlling access to data in storage which is shared by a plurality of processors are disclosed. The shared storage is located outside of main storage of each of the processors and stores a lock file. The lock file comprises a plurality of control fields containing access administration information (ZVI) authorizing the processors to access the data when not currently being accessed by another processor and a status identification code (SKC) to indicate the status of the access administration information. In response to a data access request from one of the processors, the status identification code provided by the processor is compared to the stored status identification code.