I left a set of 4 UML instances running overnight and noticed that in the
morning my computer was not very responsive (every application I tried to
interact with seemed slow). vmstat reported 96% IO wait (wa%).
Does it make sense that leaving UML instances running would raise this
statistic over time? The UMLs were very lightly loaded.
Why would having a large wa% make the system unresponsive? I must not
understand what wa really means. I would have thought that one process spending
a long time waiting for IO would not affect other processes. In other words,
one process is only waiting for IO if no other process needs the time while it
is waiting. It is certain type of idleness.
What am I missing?
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