Before you run the program again, start the vmstat 5 command in the data collection window. After a few frames of vmstat output, start the program again in the first window.

1)Youll notice that the columns labeled bo, in, and cs in the vmstat output begin to change when you start the program running. Explain what these columns represent, and why they begin to change when the program begins to run.

2)Since we know that the program repeatedly writes to and then reads back data from a set of files, why is there no activity in the column labeled bi ?

3)The column labeled cache also changes during the execution of the program. Explain this change (its really the basis for answering part b above).

4)Before the program begins running, the information listed under the id and wa columns usually shows a large percentage of CPU id and a very small percentage of CPU wa. How do these numbers change once the program begins running, and why do they change that way ?