Qsq_Print; Qsq_Service_Time; Qsq_Start; Qsq_Throughput - Red Hat ENTERPRISE LINUX 5.4 - SYSTEMTAP LANGUAGE Reference Manual

Systemtap language reference

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Chapter 9. Predefined functions

qsq_blocked:long (qname:string, scale:long)

This function returns the fraction of elapsed time during which one or more requests were on the wait

queue.

9.6.2. qsq_print

General syntax:

qsq_print:unknown (qname:string)

This function prints a line containing the following statistics for the given queue:

• queue name

• average rate of requests per second

• average wait queue length

• average time on the wait queue

• average time to service a request

• percentage of time the wait queue was used

• percentage of time any request was being serviced

General syntax:

qsq_service_time:long (qname:string, scale:long)

This function returns the average time in microseconds required to service a request once it is

removed from the wait queue.

General syntax:

qsq_start:unknown (qname:string)

This function resets the statistics counters for the given queue, and restarts tracking from the moment

the function was called. This command is used to create a queue.

General syntax:

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