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- Dec 2010
How to use "sar" or any other tools to measure cache hit ratios?
According to the manual of "sar" in Unix systems (computerhope.com/unix/usar.htm), it allows to determine the number of accesses to system buffers (lread and lwrite). Thus, we can easily calculate the cache hit ratio of I/Os via the system buffer.
However, "sar" in Linux only measures I/Os to physical devices (as bread and bwrite), instead of those to the system buffer (linux.die.net/man/1/sar)
I need to measure cache hit ratios for I/Os on Linux system buffer, and was wondering if there's a way to use "sar" or any other similar tools to determine such ratios.
Please let me know if you have any clues.
Thank you very much,