WebSphere Enterprise Service Bus for z/OS, Version 6.2.0 Operating Systems: z/OS


Synchronous invocations

The ARM performance statistics that can be obtained from a simple SCA call to a service and the response from the service are described.

Parameters

Event monitoring for SCA components includes the event points that are shown in black Black event point, while the event points shown in blue Blue event point are used only to calculate and fire PMI/ARM statistics.

In the table and diagram below, the "current" ARM transaction (denoted as X1) is created when the calling service component was invoked for the first time. If the caller is not a service component, the current arm transaction will be used, or a new one will be created. If it is not the starting transaction it will have a parent. This is represented in the following table and diagram with the notation Xn.Xn+1. These are used to show the transaction lineage. Every SCA invocation starts a new transaction, which is parented by the current transaction of the caller. You can create new transactions and you can access the current transaction, but this will not modify the SCA transaction lineage.

Table 1. Arm statistics for synchronous invocations of SCA
Statistics Formula ARM Transaction
TotalResponseTime t3 - t0 X0 .X1
RequestDeliveryTime t1 - t0 X1 .X2
ResponseDeliveryTime t3 - t2  
GoodRequests CountEXIT  
BadRequests CountFAILURE  
ProcessTime t2 - t1  

Diagram of ARM statistics obtained from a SCA call with a synchronous implementation


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Timestamp icon Last updated: 21 June 2010


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