Re: successive bonnie++ tests taking longer and longer to run (system load steadily increasing)

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Raghavendra G wrote:

    However, at two points during the multi-day test run, something
    strange happened.  The time to completion dropped _dramatically_,
    and stayed there for numerous iterations, before jumping back up again :


Mostly reads are being served from io-cache?

Perhaps ; it is worth noting that even though the operations are consistent, the data are being generated randomly. I concede that, statistically speaking, some of those 0's and 1's would be cached effectively, but this shouldn't account for a sudden ~ 50% increase in efficiency that, just as suddenly as it appears, disappears again.

While it is irresponsible to extrapolate based on three points, my newest test run with io-cache disabled has yielded 10m30s, 10m36s, and 10m34s so far...


--
Daniel Maher <dma+gluster AT witbe DOT net>




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