## FAQ: How can I figure out which processes are IO-bound?

The `bi` and `bo` columns of `vmstat` output stand for blocks in and blocks
out.  Some programs exist to parse this output, such as
[Iotop](http://guichaz.free.fr/iotop/).  On systems where DTrace is enabled,
a DTrace-using `iotop` may already be installed.  This applies to OS X, at
least.