When to Increase or Decrease Threads for Processing Documents

Your knowledge of your integration solution is the best tool for determining when to adjust thread usage for document processing (trigger execution). For example, suppose that a batch process that occurs at the same time each day results in a spike in document publishing. You might want to increase threads for document processing right before the batch process starts to make server threads available to process documents.

Alternatively, if you observe memory constraints or other resource issues, you can decrease the number of threads for document processing. Document processing consumes memory because Integration Server keeps the document in memory while the server thread evaluates the document and executes the trigger service.

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You can also determine when to modify the number of threads allowed for document processing by monitoring thread usage. You can do this by viewing the thread usage information displayed on the Server > Statistics page. However, you can also establish a warning threshold that instructs Integration Server to alert you when the number of available threads drops below a particular level. Specifically, Integration Server creates a journal log entry stating "Available Threads Warning Threshold Usage Exceeded." When Integration Server writes this journal log entry, you might want to decrease threads for document processing to allow more threads to be used for other functions. For more information about setting an available threads warning threshold, seeManaging the Server Thread Pool.

Another way to determine when to alter the number of server threads allotted for processing documents is to monitor the current number of threads that are processing documents for triggers. Integration Server Administrator displays this value in the Current Threads field located under Document Processing on the Settings > Messaging > webMethods Messaging Trigger Management page.

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Other ways to control the resources used for document processing are: adjusting execution threads for concurrent triggers and suspending or resuming document processing for triggers. For more information about adjusting trigger queue capacity, see Decreasing Document Processing for Concurrent Triggers. For more information about suspending (or resuming) document processing, see Suspending and Resuming Document Processing.