Add vsync io engine

[fio.git] / README

diff --git a/README b/README
index b7fc96b6888d1032bf04cbbb5f8c5f309fa18e7c..940839c3892a354da5332b1234dca4d914e1b473 100644 (file)
--- a/README
+++ b/README
@@ -62,6 +62,7 @@ Command line
 ------------
 
 $ fio
+        --debug         Enable some debugging options (see below)
         --output        Write output to file
         --runtime       Runtime in seconds
         --latency-log   Generate per-job latency logs
@@ -72,6 +73,9 @@ $ fio
        --cmdhelp=cmd   Print command help, "all" for all of them
        --showcmd       Turn a job file into command line options
        --readonly      Turn on safety read-only checks
+       --eta=when      When ETA estimate should be printed
+                       May be "always", "never" or "auto"
+
 
 Any parameters following the options will be assumed to be job files,
 unless they match a job file parameter. You can add as many as you want,
@@ -84,6 +88,21 @@ if rw=write/randwrite/rw/randrw is given, but this extra safety net can
 be used as an extra precaution. It will also enable a write check in the
 io engine core to prevent an accidental write due to a fio bug.
 
+The debug switch allows adding options that trigger certain logging
+options in fio. Currently the options are:
+
+       process         Dump info related to processes
+       file            Dump info related to file actions
+       io              Dump info related to IO queuing
+       mem             Dump info related to memory allocations
+       blktrace        Dump info related to blktrace setup
+       verify          Dump info related to IO verification
+       all             Enable all debug options
+       ? or help       Show available debug options.
+
+You can specify as many as you want, eg --debug=file,mem will enable
+file and memory debugging.
+
 
 Job file
 --------
@@ -117,13 +136,16 @@ The job file parameters are:
        size=x          Set file size to x bytes (x string can include k/m/g)
        ioengine=x      'x' may be: aio/libaio/linuxaio for Linux aio,
                        posixaio for POSIX aio, sync for regular read/write io,
-                       mmap for mmap'ed io, syslet-rw for syslet driven
-                       read/write, splice for using splice/vmsplice,
-                       sgio for direct SG_IO io, net for network io, or cpuio
-                       for a cycler burner load. sgio only works on Linux on
-                       SCSI (or SCSI-like devices, such as usb-storage or
-                       sata/libata driven) devices. Fio also has a null io
-                       engine, which is mainly used for testing fio itself.
+                       psync for regular pread/pwrite io, vsync for regular
+                       readv/writev (with queuing emulation) mmap for mmap'ed
+                       io, syslet-rw for syslet driven read/write, splice for
+                       using splice/vmsplice, sgio for direct SG_IO io, net
+                       for network io, or cpuio for a cycler burner load. sgio
+                       only works on Linux on SCSI (or SCSI-like devices, such
+                       as usb-storage or sata/libata driven) devices. Fio also
+                       has a null io engine, which is mainly used for testing
+                       fio itself.
+
        iodepth=x       For async io, allow 'x' ios in flight
        overwrite=x     If 'x', layout a write file first.
        nrfiles=x       Spread io load over 'x' number of files per job,