How to measure Linux Performance Wrong

By Peter Zaitsev from Percona

Session summary

Intro slide

Concurrency & latency

CPU

Look up USE method, e.g. Brendan Gregg

LoadAvg is interesting but what are the resources of the machine? Also this blurs IO and CPU usage. 

Look at Saturation metrics, normalised load and ??

PSI – new feature Pressure Stall Information

Look runqlat a command line tool to look at run queue latency

CPU states to not:

IO wait is idle

Steal is CPU not available to your VM

Disk space used vs file length, think sparse files. These are missed in du – sh commands.

free look at available memory not free memory running out.

ping or mtr?

Area of research bcc tools

 

 

 

 

 

 

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