Document 'openfiles' option

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 483f68bc5b6a69f372acaa7ecc0f8482a0bb40f3..d1a3ad1e3291bb5b23555ec5c388c2ab48185322 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -253,6 +253,10 @@ bs_unaligned       If this option is given, any byte size value within bsrange
 
 nrfiles=int    Number of files to use for this job. Defaults to 1.
 
+openfiles=int  Number of files to keep open at the same time. Defaults to
+               the same as nrfiles, can be set smaller to limit the number
+               simultaneous opens.
+
 file_service_type=str  Defines how fio decides which file from a job to
                service next. The following types are defined:
 
@@ -669,10 +673,11 @@ util=             The disk utilization. A value of 100% means we kept the disk
 ----------------
 
 For scripted usage where you typically want to generate tables or graphs
-of the results, fio can output the results in a comma separated format.
+of the results, fio can output the results in a semicolon separated format.
 The format is one long line of values, such as:
 
-client1,0,0,936,331,2894,0,0,0.000000,0.000000,1,170,22.115385,34.290410,16,714,84.252874%,366.500000,566.417819,3496,1237,2894,0,0,0.000000,0.000000,0,246,6.671625,21.436952,0,2534,55.465300%,1406.600000,2008.044216,0.000000%,0.431928%,1109
+client1;0;0;1906777;1090804;1790;0;0;0.000000;0.000000;0;0;0.000000;0.000000;929380;1152890;25.510151%;1078276.333333;128948.113404;0;0;0;0;0;0.000000;0.000000;0;0;0.000000;0.000000;0;0;0.000000%;0.000000;0.000000;100.000000%;0.000000%;324;100.0%;0.0%;0.0%;0.0%;0.0%;0.0%;0.0%;100.0%;0.0%;0.0%;0.0%;0.0%;0.0%
+;0.0%;0.0%;0.0%;0.0%;0.0%
 
 Split up, the format is as follows:
 
@@ -688,4 +693,7 @@ Split up, the format is as follows:
                Completion latency: min, max, mean, deviation
                Bw: min, max, aggregate percentage of total, mean, deviation
        CPU usage: user, system, context switches
+       IO depths: <=1, 2, 4, 8, 16, 32, >=64
+       IO latencies: <=2, 4, 10, 20, 50, 100, 250, 500, 750, 1000, >=2000
+       Text description