fio_plugin: add norandommap=1 recommendation to README
While here, also mention that the plugin only supports a single thread currently. Signed-off-by: Jim Harris <james.r.harris@intel.com> Change-Id: I265e59a89e77cd8ed26419e811aa2f36afcd37b3
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@ -38,3 +38,9 @@ To select NVMe devices, you simply pass an identifier as the filename in the for
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Remember that NVMe namespaces start at 1, not 0! Also, the notation uses '.' throughout,
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not ':'. For example - 0000.04.00.0/1.
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Currently the fio_plugin is limited to a single thread, so only one job is supported.
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When testing random workloads, it is recommended to set norandommap=1. fio's random map
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processing consumes extra CPU cycles which will degrade performance over time with
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the fio_plugin since all I/O are submitted and completed on a single CPU core.
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