Hello,
How can I calculate using VST the buffer hits ratio, we can see via promon?
I don't know which VST and fields to use...
Thanks
The computation done by the promon program for the buffer hit ratio is
(logical reads + logical writes - os reads) * 100
-------------------------------------------------
(logical reads + logical writes)
these values can be obtained from a couple of places in the vsts. Using _actbuffer, the hit ratio is
hr = ((_buffer-logicrds + _buffer-logicwrts - _buffer-osrds) * 100) / (_buffer-logicrds + _buffer-logicwrts).
note that small differences in the hit ratio can mean much larger changes in the i/o rate. for example, a decrease in the hit ratio from 99.5 to 99.0 percent is double the i/o.