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ep:laboratoare:02 [2016/11/01 10:20] emilian.radoi |
ep:laboratoare:02 [2017/10/02 20:27] (current) emilian.radoi |
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| ====== Tutorial 02 ====== | ====== Tutorial 02 ====== | ||
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| The material for this tutorial was taken from Darren Hoch’s “Linux System and Performance Monitoring”. You can access it at: http://ufsdump.org/papers/oscon2009-linux-monitoring.pdf. | The material for this tutorial was taken from Darren Hoch’s “Linux System and Performance Monitoring”. You can access it at: http://ufsdump.org/papers/oscon2009-linux-monitoring.pdf. | ||
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| - Convert 1 of 166 to decimal (1/166 = 0.006 seconds per Rotation) | - Convert 1 of 166 to decimal (1/166 = 0.006 seconds per Rotation) | ||
| - Multiply the seconds per rotation by 1000 milliseconds (6 MS per rotation) | - Multiply the seconds per rotation by 1000 milliseconds (6 MS per rotation) | ||
| - | - Divide the total in half (6/2 = 3 MS) or RD | + | - Divide the total in half (6/2 = 3 MS) (RD is considered half a revolution around a disk) |
| - Add an average of 3 MS for seek time (3 MS + 3 MS = 6 MS) | - Add an average of 3 MS for seek time (3 MS + 3 MS = 6 MS) | ||
| - Add 2 MS for latency (internal transfer) (6 MS + 2 MS = 8MS) | - Add 2 MS for latency (internal transfer) (6 MS + 2 MS = 8MS) | ||
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| Hint | Hint | ||
| - | * Divide the reads per second (//r/s//) and the writes per second (//w/s//) by the kilobytes read (//rkB/s//) and written (//wkB/s//) per second. | + | * Divide the kilobytes read (//rkB/s//) and written (//wkB/s//) per second by the reads per second (//r/s//) and the writes per second (//w/s//). |
| ==== Ex02 ==== | ==== Ex02 ==== | ||
