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I have been monitoring server side performance. I got some graph based on the reading, but I am not able to figure out the unit on the y-axis numbers. Is the CPU utilization calculated in % or some other unit? And what about memory, Network I/O, Swap memory??? Can any one suggest something.Is the unit on y-axis is bytes???

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For particular your image Y axis stands for Swap (page) file usage in bytes depending on chosen metric which could be one of:

  • used
  • pagein
  • pageout
  • free
  • total

You can calculate percentage for swap file as used/total * 100. For other metrics you will need to play the same trick.

See How to Monitor Your Server Health & Performance During a JMeter Load Test article for more information on monitoring server-side performance counters with PerfMon

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