io_u: Fix bad interaction with --openfiles and non-sequential file selection policy

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index a881277c80279873f16414ce7a257fa5ab881bbd..45ec8d43dcbf8172318f91d12c33005037386bd9 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -1462,9 +1462,31 @@ starting I/O if the platform and file type support it. Defaults to true.
 This will be ignored if \fBpre_read\fR is also specified for the
 same job.
 .TP
-.BI sync \fR=\fPbool
-Use synchronous I/O for buffered writes. For the majority of I/O engines,
-this means using O_SYNC. Default: false.
+.BI sync \fR=\fPstr
+Whether, and what type, of synchronous I/O to use for writes.  The allowed
+values are:
+.RS
+.RS
+.TP
+.B none
+Do not use synchronous IO, the default.
+.TP
+.B 0
+Same as \fBnone\fR.
+.TP
+.B sync
+Use synchronous file IO. For the majority of I/O engines,
+this means using O_SYNC.
+.TP
+.B 1
+Same as \fBsync\fR.
+.TP
+.B dsync
+Use synchronous data IO. For the majority of I/O engines,
+this means using O_DSYNC.
+.PD
+.RE
+.RE
 .TP
 .BI iomem \fR=\fPstr "\fR,\fP mem" \fR=\fPstr
 Fio can use various types of memory as the I/O unit buffer. The allowed
@@ -1804,6 +1826,13 @@ Read and write iscsi lun with libiscsi.
 .TP
 .B nbd
 Synchronous read and write a Network Block Device (NBD).
+.TP
+.B libcufile
+I/O engine supporting libcufile synchronous access to nvidia-fs and a
+GPUDirect Storage-supported filesystem. This engine performs
+I/O without transferring buffers between user-space and the kernel,
+unless \fBverify\fR is set or \fBcuda_io\fR is \fBposix\fR. \fBiomem\fR must
+not be \fBcudamalloc\fR. This ioengine defines engine specific options.
 .SS "I/O engine specific parameters"
 In addition, there are some parameters which are only valid when a specific
 \fBioengine\fR is in use. These are used identically to normal parameters,
@@ -2117,7 +2146,36 @@ Example URIs:
 \fInbd+unix:///?socket=/tmp/socket\fR
 .TP
 \fInbds://tlshost/exportname\fR
-
+.RE
+.RE
+.TP
+.BI (libcufile)gpu_dev_ids\fR=\fPstr
+Specify the GPU IDs to use with CUDA. This is a colon-separated list of int.
+GPUs are assigned to workers roundrobin. Default is 0.
+.TP
+.BI (libcufile)cuda_io\fR=\fPstr
+Specify the type of I/O to use with CUDA. This option
+takes the following values:
+.RS
+.RS
+.TP
+.B cufile (default)
+Use libcufile and nvidia-fs. This option performs I/O directly
+between a GPUDirect Storage filesystem and GPU buffers,
+avoiding use of a bounce buffer. If \fBverify\fR is set,
+cudaMemcpy is used to copy verification data between RAM and GPU(s).
+Verification data is copied from RAM to GPU before a write
+and from GPU to RAM after a read.
+\fBdirect\fR must be 1.
+.TP
+.BI posix
+Use POSIX to perform I/O with a RAM buffer, and use
+cudaMemcpy to transfer data between RAM and the GPU(s).
+Data is copied from GPU to RAM before a write and copied
+from RAM to GPU after a read. \fBverify\fR does not affect
+the use of cudaMemcpy.
+.RE
+.RE
 .SS "I/O depth"
 .TP
 .BI iodepth \fR=\fPint