Spotlight is a powerful diagnostic and problem-resolution tool for Windows operating systems. Its unique user interface provides you with an intuitive, visual representation of the activity on the host machine.
For information on Spotlight on Windows, see these sections
| Section |
Description |
|---|---|
| Background Information |
Introductory material to Spotlight on Windows. |
| Connect to a Windows System | Create / Modify / Delete connections to Windows systems. |
| Home Page | The Spotlight home page shows the flow of information and commands between various sub-components and the size and status of internal resources such as processes, disk files and memory structures. |
| Alarms |
Spotlight alerts you to problems with your system by issuing an alarm. You can configure Spotlight in the level of severity that constitutes an alarm, to disable an alarm, and the actions Spotlight takes on raising the alarm. |
| Drilldowns | When you have isolated a problem, you can display a drilldown page, whose charts and tables provide a detailed breakdown of the underlying statistics. |
| View | Options | Customize Spotlight. |
| Troubleshooting | Solve problems using Spotlight. |
For information on using Spotlight applications See
The Disks panel on the Spotlight on Windows home page and the Disks drilldown are not displaying data. Ensure disk performance counters are enabled on the Windows machine being monitored.
Solution: Enable collection of disk data:
On the Windows system being monitored
At the command prompt, type the following
diskperf -y
Spotlight on Windows cannot display data in the Network panel, flows, and drilldowns. The likely cause is that the appropriate performance counters have not been enabled on the Windows machine being diagnosed.
Solution: Enable the collection of network data:
In Windows systems where there are multiple processors, an activity (thread) in a process can migrate from processor to processor – and every migration reloads the processor cache.
Process affinity, which you can set on the target Windows machine via the Windows Task Manager, allows you to establish an association that permits specified processes to run ONLY on nominated processors. This limits the number of cache reloads, which may be desirable on systems operating under heavy load.
You CANNOT set process affinity via Spotlight on Windows.
What you CAN do is:
Use the Processes drilldown to indicate the CPUs where the specified process is permitted to run. This enables Spotlight to report the CPU usage for that process with accuracy.
Example: Running a process on an eight-CPU system
Spotlight uses the Windows Performance Monitor (PerfMon) to retrieve important data from target Windows systems, including the total percentage of CPU usage by specified processes.
On a single-CPU system, PerfMon can report a maximum CPU usage of 100%.
On a multiple-CPU system, that maximum value is multiplied by the number of CPUs. For an eight-CPU system, PerfMon can report a maximum CPU usage of 800%. Spotlight on Windows compensates by dividing the reported PerfMon value by the number of CPUs on the system.
However, when the affinity for a process is set so that it can run only on two nominated CPUs of the eight available, the default Spotlight calculation fails. For example, if PerfMon reports a CPU usage of 120% for the process (corresponding to a 60% usage on each permitted CPU), Spotlight initially calculates a value of 15%. Use Spotlight's Configure Affinity function to adjust the Spotlight calculation. Processes Page
How to set process affinity
Process affinity can be set via the Windows Task Manager on Windows machines that have multiple CPUs.
Right-click the name of the process whose affinity you want to set and select Set Affinity.
Note: This option is unavailable when the system has one CPU.
Note: You can also set process affinity for Microsoft SQL Server through the SQL Server Enterprise Manager.
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