Bundling Services into Servers


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The easiest way to package services into servers is to avoid packaging them at all. Unfortunately, if you do not package services, the number of servers, message queues, and semaphores rises beyond an acceptable level. Thus there is a trade-off between no bundling and too much bundling.

When to Bundle Services

We recommend that you bundle services if you have one of the situations or requirements described in the following list.

Functional similarity—if multiple services play a similar role in the application, you can bundle them in the same server. The application can offer all or none of them at a given time. In the bankapp application, for example, the WITHDRAW, DEPOSIT, and INQUIRY services are all operations that can be grouped together in a "bank teller operations" server. Administration of services is simplified when functionally similar services are bundled.
Similar libraries—less disk space is required if you bundle services that use the same libraries. For example, if you have three services that use the same 100K library and three services that use different 100K libraries, bundling the first three services saves 200K. Functionally equivalent services often use similar libraries.
Filling the queue—bundle only as many services into a server as the queue can handle. Each service added to an unfilled MSSQ set may add relatively little to the size of an executable, and nothing to the number of queues in the system. Once the queue is filled, however, system performance is degraded and you must create more executables to compensate.

Do not put two or more services that call each other, that is, call-dependent services, in the same server. If you do so, the server issues a call to itself, causing a deadlock.