mplotqueries: Graph ratio of nscanned to n(toreturn|returned) about mtools

[rueckstiess]

That feature doesn't exist yet and makes sense... The only thing close to that is mlogfilter <logfile> --scan to find queries with high nscanned/nreturned ratio but that just finds them based on a fixed threshold and doesn't plot the ratios.

[rueckstiess]

I'm going to solve this more general. I've implemented a feature to plot arbitrary fields of a logline.

For example:

mplotqueries <logfile> --type scatter --yaxis nscanned

plots the nscanned values over time.

mplotqueries <logfile> --type scatter --yaxis numYields

plots the numYields values over time.

Your particular suggestion nscanned/n is not possible with this implementation. Do you think it is really necessary to have that kind of functionality or would it be enough to find outliers by just nscanned for example?

[rueckstiess]

After implementing the general case, it was easy to make a new plottype that solves the specific nscanned/n ratio.
It is a separate new plot type called "nscanned/n" and can be invoked with:

mplotqueries <logfile> --type nscanned/n

It calculates the ratio of nscanned / n and plots the resulting number as the value for the y axis.

Logarithmic scale is orthogonal to this and already a feature. You can enable it with --logscale or by pressing the L key in a plot.

This feature will be in the develop branch soon and in the 1.0.3 release in 2 weeks.