Under­stand­ing laten­cy

Bren­dan Gregg of Sun Ora­cle fame made a good expla­na­tion how to visu­al­ize laten­cy to get a bet­ter under­stand­ing of what is going on (and as such about how to solve bot­tle­necks). I have seen all this already in var­i­ous posts in his blog and in the Ana­lyt­ics pack­age in an Open­Stor­age pre­sen­ta­tion, but the ACM arti­cle sum­ma­rizes it very good.

Unfor­tu­nate­ly Ana­lyt­ics is AFAIK not avail­able in Open­So­laris, so we can not go out and adapt it for FreeB­SD (which would prob­a­bly require to port/implement some addi­tion­al dtrace stuff/probes). I am sure some­thing like this would be very inter­est­ing to all those com­pa­nies which use FreeB­SD in an appli­ance (regard­less if it is a stor­age appli­ance like NetApp, or a net­work appli­ance like a Cis­co/Juniper router, or any­thing else which has to per­form good).

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