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Query processing is the stage of the search where the query is received from (for example, the Search Center) and is processed to apply certain rules or expansion before being matched to the content of the index. Query processing in FAST Search for SharePoint 2010 is a set of components (QR Proxy, QR Server, and fdispatch) that receive the query from the FAST Query SSA (FAST Search Query module), process it, and pass it onto the Query Matching component. The query dispatcher (fdispatch) passes the query to the index columns and eventually to any index partitions. There is an fdispatcher located on each Query Matching component to distribute queries across index partitions.

This test monitors the queries from the fdispatch, promptly reports the active queries, the open file handles in the query dispatcher and the queries that are temporarily put on hold. Using this test you can easily identify how well the queries are processed and sent to the query matching component.

Measurement	Description	Measurement Unit	Interpretation
FSActivCont	Indicates the number of queries that are currently active on the query dispatcher since the last index set change.	Number	A high value is desired for this measure.
FSInstCont	Indicates the number of queries that have been dispatched since the last index set change.	Number
FSResoUsage	Indicates the number of file handles that are currently open in the query dispatcher.	Number
FSTotResoCont	Indicates the maximum number of open file handles.	Number	The maximum number of open file handles for fdispatch is 1014 and in the case of fsearch, the maximum open file handles in 1004.
FSWaitQueLenth	Indicates the number of queries in the queue dispatcher that are temporarily put on hold.	Number	Ideally, the value of this measure should be low.