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fio基础23

The client number is printed, along with the group id and error of that thread. Below is the io statistics, here for writes. In the order listed, they denote: io= Number of megabytes io performed bw= Average bandwidth rate iops= Average IOs performed per second runt= The runtime of that thread slat= Submission latency (avg being the average, stdev being the standard deviation). This is the time it took to submit the io. For sync io, the slat is really the completion latency, since queue/complete is one operation there. This value can be in milliseconds or microseconds, fio will choose the most appropriate base and print that. In the example above, milliseconds is the best scale. Note: in --minimal mode latencies are always expressed in microseconds. clat= Completion latency. Same names as slat, this denotes the time from submission to completion of the io pieces. For sync io, clat will usually be equal (or very close) to 0, as the time from submit to complete is basically just CPU time (io has already been done, see slat explanation). bw= Bandwidth. Same names as the xlat stats, but also includes an approximate percentage of total aggregate bandwidth this thread received in this group. This last value is only really useful if the threads in this group are on the same disk, since they are then competing for disk access. cpu= CPU usage. User and system time, along with the number of context switches this thread went through, usage of system and user time, and finally the number of major and minor page faults. IO depths= The distribution of io depths over the job life time. The numbers are divided into powers of 2, so for example the 16= entries includes depths up to that value but higher than the previous entry. In other words, it covers the range from 16 to 31. IO submit= How many pieces of IO were submitting in a single submit call. Each entry denotes that amount and below, until the previous entry - eg, 8=100% mean that we submitted anywhere in

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