When you run a Data Collector Set, the data that is collected for performance counters is stored to a log file (.blg) in the location that was defined when the Data Collector Set was created. In Windows Performance Monitor, you can view log files to see a visual representation of performance counter data.
To view the Data Collector Set log file
Start Windows Performance Monitor.
Choose Start, in the Search box, type perfmon, and then choose the related link.
In the navigation pane, expand Monitoring Tools, and then choose Performance Monitor.
In the console pane toolbar, choose the View Log Data button.
The Performance Monitor Properties page opens at the Source tab.
In the Data Source section, select Log files, and then choose the Add button.
Browse to the log file that you want to view, and then choose the Open button.
Choose the OK button.