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Creating a Collector
A Collector is a user-defined collection of queries which determine the data collection carried out from one or more Host computers or devices during a Test-run. Include them in your Tests to target specific components of the WAE under test and the Hosts used to run a Test, with precise data collection queries to collect the performance data you need. Create Collectors and incorporate them into your Tests, then run the Test to generate the results data required.
Collectors give you the flexibility to collect and monitor a wide range of performance data at user defined intervals during a Test-run. A Collector can contain a single data collection query and be used to target a single Host. Or alternatively, they can contain multiple queries and target multiple Hosts.
NT Performance Collectors are used for collecting performance data from Hosts running Windows NT or Windows 2000. SNMP Collectors are used for collecting SNMP data from Hosts and other devices running an SNMP agent or proxy SNMP agent. For information SNMP Collectors please refer to the HTTP/S Load User's Guide available from OpenSTA.org.
Note: If you are using an NT Performance Collector to target a Web server that is running Microsoft IIS (Internet Information Server), you can monitor and collect performance from it by selecting the Web Service object from the Performance Object text box when you set up a new query.
In this example the procedure below takes you through adding two data collection queries targeting the same Host.
Create an NT Performance Collector
- In Commander, select File > New Collector > NT Performance.
- Or: In the Repository Window, right-click
Collectors, and select New Collector > NT Performance.
- The Collector appears in the Repository Window with a small crossed red circle over the Collector icon
, indicating that the Collector has no content.
- Note: After you have opened a Collector and defined a data collection query using the Edit Query dialog box in the Collector Pane, the icon changes to reflect this
.
- Give the new Collector a name within the Repository Window, in this example NT_PERFORMANCE, then press Return.
- In the Repository Window, double-click the new Collector
NT_PERFORMANCE, to open the Collector Pane in the Commander Main Window, where you can setup your data collection queries.
- In the Name text box enter a unique title for the data collection query, in this case Processor.
- Note: When you run a Test the query name you enter is listed in the Available Views text box which is displayed in the Monitoring tab of the Test Pane. You can select and monitor queries during a Test-run.
Query names also appear in the Custom SNMP graph with the associated results data. Use the Results Window in the Results tab of the Test Pane to display them.- Click the Browse Queries button to open the Browse Performance Counters dialog box and define the query.
- In the Browse Performance Counters dialog box, select the Host you want to collect data from. You can select to either:
- Use local computer counters: Collects data from the computer you are currently using.
- Or, Select counters from computer: Enables you to specify a networked computer. Type \\ then the name of the computer, or click
and select a computer from the list.
- In the Performance object selection box select a performance object, in this example Processor. Click
, to the right of the selection box and choose an entry from the drop down list.
- In the Performance counters selection box choose a performance counter, in this example % Processor Time.
- In the Instances selection box pick an instance of the selected performance counter.
- Click OK to confirm your choices and return to the Edit Query dialog box.
- In the Interval text box enter a time period in seconds, for example 5, to control the frequency of data collection, or use
, to set a value.
- Leave the Delta Value column check box unchecked to record the raw data value, or check the box to record the Delta value.
- Click OK to display the data collection query you have defined in the Collector Pane.
- Use
, in the toolbar to add an additional query then repeat steps 4-13. This time select the Memory Performance object and Page Faults/sec Performance counter.
After you have created the Collector, the next step is to add it to a Test. Move on to the next section for details on how to create a Test.
Next Section: Creating a Test
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