Java problem on Fedora 17

Michael Torrie torriem at gmail.com
Thu Oct 25 10:39:05 MDT 2012


On 10/25/2012 10:34 AM, Michael Torrie wrote:
> When everything hangs, can you kill the java compile process immediately
> and have everything unfreeze fairly instantly?  Or does it take a while
> for things to settle down?  Is your hard drive light going light mad
> when things are hung?  What is your load average during the hang?  Are
> any processes in the "D" or uninterruptible sleep stage?  If you run top
> and sort by memory usage, how much VSS/Virt are your largest processes
> (shift-m to sort by that)?  What is your swap file usage at that point?

Also, top gives you the percentage of the time processes are in i/o
waiting on the 3rd line.  A higher i/o wait percentage starving for i/o,
perhaps due to thrashing.  And just to explain the load average, the
load average is roughly the number of processes waiting for i/o (or
something) before the scheduler can run them again.  The higher the load
average, typically the higher the amount of thrashing going on.  Or
you've got major problems in the i/o subsystem, like disk errors, or nfs
went away.  That sort of thing.


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