X-Git-Url: https://git.kernel.dk/?p=fio.git;a=blobdiff_plain;f=HOWTO;h=142b83e5020f9b77303756354c9a3ef8cdbaa682;hp=45cf0bdf4b7367a870f472d23aac8e45de60e43c;hb=de5ed0e4d398bc9d4576f9b2b82d7686989c27e1;hpb=55bfd8c81c25d7953b4d6f9320e46af5cb790b0c diff --git a/HOWTO b/HOWTO index 45cf0bdf..142b83e5 100644 --- a/HOWTO +++ b/HOWTO @@ -1991,6 +1991,8 @@ I/O engine Asynchronous read and write using DDN's Infinite Memory Engine (IME). This engine will try to stack as much IOs as possible by creating requests for IME. FIO will then decide when to commit these requests. + **libiscsi** + Read and write iscsi lun with libiscsi. I/O engine specific parameters ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ @@ -2339,8 +2341,13 @@ I/O depth ``serialize_overlap`` tells fio to avoid provoking this behavior by explicitly serializing in-flight I/Os that have a non-zero overlap. Note that setting this option can reduce both performance and the :option:`iodepth` achieved. - Additionally this option does not work when :option:`io_submit_mode` is set to - offload. Default: false. + + This option only applies to I/Os issued for a single job except when it is + enabled along with :option:`io_submit_mode`=offload. In offload mode, fio + will check for overlap among all I/Os submitted by offload jobs with :option:`serialize_overlap` + enabled. + + Default: false. .. option:: io_submit_mode=str @@ -2559,12 +2566,13 @@ I/O replay .. option:: replay_align=int - Force alignment of I/O offsets and lengths in a trace to this power of 2 - value. + Force alignment of the byte offsets in a trace to this value. The value + must be a power of 2. .. option:: replay_scale=int - Scale sector offsets down by this factor when replaying traces. + Scale byte offsets down by this factor when replaying traces. Should most + likely use :option:`replay_align` as well. .. option:: replay_skip=str @@ -3000,6 +3008,10 @@ Steady state data from the rolling collection window. Threshold limits can be expressed as a fixed value or as a percentage of the mean in the collection window. + When using this feature, most jobs should include the :option:`time_based` + and :option:`runtime` options or the :option:`loops` option so that fio does not + stop running after it has covered the full size of the specified file(s) or device(s). + **iops** Collect IOPS data. Stop the job if all individual IOPS measurements are within the specified limit of the mean IOPS (e.g., ``iops:2`` @@ -3681,7 +3693,8 @@ is one long line of values, such as:: 2;card0;0;0;7139336;121836;60004;1;10109;27.932460;116.933948;220;126861;3495.446807;1085.368601;226;126864;3523.635629;1089.012448;24063;99944;50.275485%;59818.274627;5540.657370;7155060;122104;60004;1;8338;29.086342;117.839068;388;128077;5032.488518;1234.785715;391;128085;5061.839412;1236.909129;23436;100928;50.287926%;59964.832030;5644.844189;14.595833%;19.394167%;123706;0;7313;0.1%;0.1%;0.1%;0.1%;0.1%;0.1%;100.0%;0.00%;0.00%;0.00%;0.00%;0.00%;0.00%;0.01%;0.02%;0.05%;0.16%;6.04%;40.40%;52.68%;0.64%;0.01%;0.00%;0.01%;0.00%;0.00%;0.00%;0.00%;0.00% A description of this job goes here. -The job description (if provided) follows on a second line. +The job description (if provided) follows on a second line for terse v2. +It appears on the same line for other terse versions. To enable terse output, use the :option:`--minimal` or :option:`--output-format`\=terse command line options. The @@ -3766,6 +3779,11 @@ minimal output v3, separated by semicolons:: 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_min;read_clat_max;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_min;write_clat_max;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;cpu_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 +In client/server mode terse output differs from what appears when jobs are run +locally. Disk utilization data is omitted from the standard terse output and +for v3 and later appears on its own separate line at the end of each terse +reporting cycle. + JSON output ------------ @@ -4044,6 +4062,7 @@ is recorded. Each *data direction* seen within the window period will aggregate its values in a separate row. Further, when using windowed logging the *block size* and *offset* entries will always contain 0. + Client/Server ------------- @@ -4131,3 +4150,6 @@ containing two hostnames ``h1`` and ``h2`` with IP addresses 192.168.10.120 and /mnt/nfs/fio/192.168.10.120.fileio.tmp /mnt/nfs/fio/192.168.10.121.fileio.tmp + +Terse output in client/server mode will differ slightly from what is produced +when fio is run in stand-alone mode. See the terse output section for details.