International System of Units (SI):
.RS
.P
-ki means kilo (K) or 1000
+Ki means kilo (K) or 1000
.RE
.RS
-mi means mega (M) or 1000**2
+Mi means mega (M) or 1000**2
.RE
.RS
-gi means giga (G) or 1000**3
+Gi means giga (G) or 1000**3
.RE
.RS
-ti means tera (T) or 1000**4
+Ti means tera (T) or 1000**4
.RE
.RS
-pi means peta (P) or 1000**5
+Pi means peta (P) or 1000**5
.RE
.P
To specify power-of-2 binary values defined in IEC 80000-13:
.RS
.P
-k means kibi (Ki) or 1024
+K means kibi (Ki) or 1024
.RE
.RS
-m means mebi (Mi) or 1024**2
+M means mebi (Mi) or 1024**2
.RE
.RS
-g means gibi (Gi) or 1024**3
+G means gibi (Gi) or 1024**3
.RE
.RS
-t means tebi (Ti) or 1024**4
+T means tebi (Ti) or 1024**4
.RE
.RS
-p means pebi (Pi) or 1024**5
+P means pebi (Pi) or 1024**5
.RE
.P
With `kb_base=1024' (the default), the unit prefixes are opposite
terse_version_3;fio_version;jobname;groupid;error;read_kb;read_bandwidth;read_iops;read_runtime_ms;read_slat_min;read_slat_max;read_slat_mean;read_slat_dev;read_clat_max;read_clat_min;read_clat_mean;read_clat_dev;read_clat_pct01;read_clat_pct02;read_clat_pct03;read_clat_pct04;read_clat_pct05;read_clat_pct06;read_clat_pct07;read_clat_pct08;read_clat_pct09;read_clat_pct10;read_clat_pct11;read_clat_pct12;read_clat_pct13;read_clat_pct14;read_clat_pct15;read_clat_pct16;read_clat_pct17;read_clat_pct18;read_clat_pct19;read_clat_pct20;read_tlat_min;read_lat_max;read_lat_mean;read_lat_dev;read_bw_min;read_bw_max;read_bw_agg_pct;read_bw_mean;read_bw_dev;write_kb;write_bandwidth;write_iops;write_runtime_ms;write_slat_min;write_slat_max;write_slat_mean;write_slat_dev;write_clat_max;write_clat_min;write_clat_mean;write_clat_dev;write_clat_pct01;write_clat_pct02;write_clat_pct03;write_clat_pct04;write_clat_pct05;write_clat_pct06;write_clat_pct07;write_clat_pct08;write_clat_pct09;write_clat_pct10;write_clat_pct11;write_clat_pct12;write_clat_pct13;write_clat_pct14;write_clat_pct15;write_clat_pct16;write_clat_pct17;write_clat_pct18;write_clat_pct19;write_clat_pct20;write_tlat_min;write_lat_max;write_lat_mean;write_lat_dev;write_bw_min;write_bw_max;write_bw_agg_pct;write_bw_mean;write_bw_dev;cpu_user;cpu_sys;cpu_csw;cpu_mjf;pu_minf;iodepth_1;iodepth_2;iodepth_4;iodepth_8;iodepth_16;iodepth_32;iodepth_64;lat_2us;lat_4us;lat_10us;lat_20us;lat_50us;lat_100us;lat_250us;lat_500us;lat_750us;lat_1000us;lat_2ms;lat_4ms;lat_10ms;lat_20ms;lat_50ms;lat_100ms;lat_250ms;lat_500ms;lat_750ms;lat_1000ms;lat_2000ms;lat_over_2000ms;disk_name;disk_read_iops;disk_write_iops;disk_read_merges;disk_write_merges;disk_read_ticks;write_ticks;disk_queue_time;disk_util
.fi
.RE
+.SH JSON+ OUTPUT
+The \fBjson+\fR output format is identical to the \fBjson\fR output format except that it
+adds a full dump of the completion latency bins. Each \fBbins\fR object contains a
+set of (key, value) pairs where keys are latency durations and values count how
+many I/Os had completion latencies of the corresponding duration. For example,
+consider:
+
+.RS
+"bins" : { "87552" : 1, "89600" : 1, "94720" : 1, "96768" : 1, "97792" : 1, "99840" : 1, "100864" : 2, "103936" : 6, "104960" : 534, "105984" : 5995, "107008" : 7529, ... }
+.RE
+
+This data indicates that one I/O required 87,552ns to complete, two I/Os required
+100,864ns to complete, and 7529 I/Os required 107,008ns to complete.
+
+Also included with fio is a Python script \fBfio_jsonplus_clat2csv\fR that takes
+json+ output and generates CSV-formatted latency data suitable for plotting.
+
+The latency durations actually represent the midpoints of latency intervals.
+For details refer to stat.h.
+
+
.SH TRACE FILE FORMAT
There are two trace file format that you can encounter. The older (v1) format
is unsupported since version 1.20-rc3 (March 2008). It will still be described
projects / fio.git / blobdiff