Em 20/04/2013 09:09, Tobi Oetiker escreveu:
hi daniel
On 19.04.2013, at 16:42, Daniel Hilst Selli <[email protected]> wrote:
AFAIK, major page faults are generated when data that is not yet present
on RAM is loaded from disk, but in this case data is being write do
disk, I can't
see how writes can generate faults, but still, it seems that is
happening, ... !?
rrdtool changes just few bytes in the rrf file with each update
the OS though can only write a complete block of data to disk.
so when you write a byte to a file, the OS has to first fetch the block, modify
the byte and write the block back
that is why rrdtool benefits greatly from more RAM as it can hold mor blocks in
RAM and does not have to read them first.
cheers tobi
Thanks Tobi, I had no idea about this read/update/write process, Now I
know how to improve the performance of my
collectd+rrdtool stuff,
Cheers
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