[rrd-developers] [PATCH,RFC] optional mmap based file I/O

Dave Plonka plonka at doit.wisc.edu
Wed May 30 19:15:33 CEST 2007

On Wed, May 30, 2007 at 12:07:25PM -0500, Dave Plonka wrote:
> This is
> what we've observed with Dale Carder's RRDCache application level
> cache strategy.  The CSV "journal" method that Kevin mentioned recently
> sounds essentially the same: i.e just save up the update arguments
> in a journal, then group them by RRD file and call update many times
> in quick succession, periodically.

A slight correction - now I remember Dale noticed it is possible to
 many sets of arguments to update a time so he did that, rather
than calling it very many times.

Of course that's better, but either way, the write to disk will
be coalesced.


plonka at doit.wisc.edu  http://net.doit.wisc.edu/~plonka/  Madison, WI

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