Brendan Moloney wrote:
Any input on things to check would be greatly appreciated.

It might be useful to run some tools like dstat, top/htop, vmstat and iostat while performing the rendering and summarise any behaviour which co-incides with the hiccups.

Have you ganglia on your cluster? You might notice system resource spikes which co-incide with your hiccups.

-stephen

--
Stephen Mulcahy, Applepie Solutions Ltd., Innovation in Business Center,
GMIT, Dublin Rd, Galway, Ireland.  +353.91.751262  http://www.aplpi.com
Registered in Ireland, no. 289353 (5 Woodlands Avenue, Renmore, Galway)
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