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zipf is a power law probability distribution. When applied to performance testing of block devices, it will select blocks over the full range of LBAs, but will more frequently select lower-numbered LBAs. The theta parameter governs the distribution - higher values of theta will concentrate the distribution on a smaller number of LBAs. Note that fio supports zipf, so adding it to SPDK will enable our perf tools (bdevperf, nvme-perf) to provide similar functionality. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: I7df129c9d61996a2070188c6cd9f1fde631ac208 Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7779 Tested-by: SPDK CI Jenkins <sys_sgci@intel.com> Community-CI: Broadcom CI Community-CI: Mellanox Build Bot Reviewed-by: Ben Walker <benjamin.walker@intel.com> Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com> |
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