Wire up exp/test-expression-parser

[fio.git] / fio.1

diff --git a/fio.1 b/fio.1
index c61948bb52814a2a6bac248c5db0063406225a48..01c7cec03b5b345b3ac135608c5846844d145980 100644 (file)
--- a/fio.1
+++ b/fio.1
@@ -115,7 +115,15 @@ and there may be any number of global sections.  Specific job definitions
 may override any parameter set in global sections.
 .SH "JOB PARAMETERS"
 .SS Types
-Some parameters may take arguments of a specific type.  The types used are:
+Some parameters may take arguments of a specific type.
+Anywhere a numeric value is required, an arithmetic expression may be used,
+provided it is surrounded by parentheses.
+Supported operators are
+addition, subtraction, multiplication, division, modulus, and exponentiation.
+For time values in expressions
+units are microseconds by default.  This is different than for time
+values not in expressions (not enclosed in parentheses).
+The types used are:
 .TP
 .I str
 String: a sequence of alphanumeric characters.
@@ -478,7 +486,15 @@ size, fio can alternate random and zeroed data throughout the IO buffer.
 If set, fio will fill the IO buffers with this pattern. If not set, the contents
 of IO buffers is defined by the other options related to buffer contents. The
 setting can be any pattern of bytes, and can be prefixed with 0x for hex
-values.
+values. It may also be a string, where the string must then be wrapped with
+"".
+.TP
+.BI dedupe_percentage \fR=\fPint
+If set, fio will generate this percentage of identical buffers when writing.
+These buffers will be naturally dedupable. The contents of the buffers depend
+on what other buffer compression settings have been set. It's possible to have
+the individual buffers either fully compressible, or not at all. This option
+only controls the distribution of unique buffers.
 .TP
 .BI nrfiles \fR=\fPint
 Number of files to use for this job.  Default: 1.
@@ -679,7 +695,9 @@ Fio will normally perform IOs until it has exhausted the size of the region
 set by \fBsize\fR, or if it exhaust the allocated time (or hits an error
 condition). With this setting, the range/size can be set independently of
 the number of IOs to perform. When fio reaches this number, it will exit
-normally and report status.
+normally and report status. Note that this does not extend the amount
+of IO that will be done, it will only stop fio if this condition is met
+before other end-of-job criteria.
 .TP
 .BI fsync \fR=\fPint
 How many I/Os to perform before issuing an \fBfsync\fR\|(2) of dirty data.  If