TuningRRD – RRDtool Trac
Tuning RRDtool for performance RRDtool minimizes writing to disk by using circular buffers. If you run a small deployment of RRDtool with a few hundred rrd files, you will find RRDtool to be very fast in updating its rrd files. If your installation runnins into 50k or 100k or even more rrd files, things may be less speedy. Background Information To understand RRDtool performance tuning, you must k
Page Cache, the Affair Between Memory and Files
Previously we looked at how the kernel manages virtual memory for a user process, but files and I/O were left out. This post covers the important and often misunderstood relationship between files and memory and its consequences for performance. Two serious problems must be solved by the OS when it comes to files. The first one is the mind-blowing slowness of hard drives, and disk seeks in particu
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