6 The T9000 Farm

6.6 On-line monitoring

The event reconstruction code (CPREAD) produces a standard set of histograms for monitoring purposes. A process on a T9000 (a separate process for each network) was used to collect these histograms from each worker and communicate them to the SUN host, where the PAW (Physics Analysis Workstation) package [17] was used to view them.

As a method of checking the behaviour of the T9000 farm, the acceptance of CPREAD as seen by each processing node was monitored. This acceptance is defined as the fraction of events which passed the selection criteria of CPREAD. The acceptance as a function of the Worker Identifier is shown in Fig. . This approach provided information on the state of an individual worker and an indication of the quality of the data. More detailed monitoring was performed by using the standard set of histograms produced by each worker.

Application of T9000 to CPLEAR - 09 NOV 95

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