On 15/02/18 09:26, David Mathog wrote:

Sometimes for no reason that I can discern an IO operation on this machine will stall. Things that should take seconds will run for minutes, or at least until I get tired of waiting and kill them.
Here is today's example:

gunzip -c largeFile.gz > largeFile

Does "perf top -p ${PID}" show anything useful about where the
processes is spending its time?

Good luck!
Chris
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