Viewing scheduler information

The Scheduler maintains the internal list of the requests for data. The Scheduler regularly scans the list to determine whether requests are executed placed into a waiting queue. A task placed in a waiting queue is flagged as "READY." You can view statistics compiled by the collector about the planning of requests.

Procedure

  1. Click Collector Information from the Monitor tab.
  2. Select a collector from the list.
  3. Click the Scheduler tab.
    The Scheduler window displays the following information:
    Item Description
    Collections Priority Mode

    Indicates the number of Collections Priority Mode requests on the current collector.

    Execute requests
    Indicates the number of requests being executed on the collector.
    • Execute external requests (Nb) [immediate] - Indicates the number of external requests being executed on the collector.
    • Execute internal requests (Nb) [immediate] - Indicates the number of internal requests being executed on the collector.
    Items Processed
    Indicates the collector activity level. The activity level is measured in number of requests executed per second over a specific time period.
    • Items Processed Average (Nb) [last 24 hours] - Indicates the number of requests executed during the last 24 hours.
    • Items Processed Average (Nb) [last hour] - Indicates the number of requests executed during the last hour.
    • Items Processing Rate (Nb/s) [last 24 hours] - Indicates the request execution rate per second during the last 24 hours. You can compare this activity level with results on comparable systems to evaluate performance.
    • Items Processing Rate (Nb/s) [last hour] - Indicates the request execution rate per second during the last hour. This rate is similar to the rate for the last 24 hours but is more sensitive to variations during collections over longer periods (longer than one hour).
    Items Scheduled
    Requests that need to be executed. The Scheduler scans the list to determine the requests to execute or to place in the waiting queue.
    • Items Scheduled (Nb) [immediate] indicates the number of requests generated in this list.
    • Max Items Scheduled (Nb) [immediate] indicates the maximum configuration value for the request list size.
    Queue Max Size
    Third of the three waiting queues where a thread searches for a request number to execute.
    • Queue Max Size (Nb) [last 24 hours] indicates the maximum size attained by the queue during the last 24 hours.
    • Queue Max Size (Nb) [last hour] indicates the maximum size attained by the queue during the last hour.
    • Queue Size (Nb) [immediate] indicates the current size of the queue.
    Threads
    Collector activity creates threads. The collector verifies it can activate a thread each time it executes a collection or launches a command. If it cannot activate a thread, no collector activity occurs and reliability is diminished.
    • Threads (Nb) [immediate] - Indicates the number of threads created through collector activity. This is a realtime counter. The value can change quickly from 1 to MaxThreadedItems. You can tune this value in the registry.conf file in the following location:
      $PVMHOME/conf/registry.conf
    • Threads Availability (%) [last 24 hours] - Indicates collector reliability during the last 24 hours.
    • Threads Availability (%) [last hour] - Indicates collector reliability during the last hour.
    internal errors (Nb) [cumul]

    Indicates the number of memory errors detected and corrected. This counter needs to remain at zero. If it is not at zero, restart the collector.