Declare stat_calc_lat_nu() static

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index e4d3198e49559e0e085cd04e8adc2fa8495a424e..8ee00fd1210dbf7089f5b58b270f46ebb41c2721 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1854,12 +1854,12 @@ I/O engine
 
                **pmemblk**
                        Read and write using filesystem DAX to a file on a filesystem
 
                **pmemblk**
                        Read and write using filesystem DAX to a file on a filesystem

-                       mounted with DAX on a persistent memory device through the NVML
+                       mounted with DAX on a persistent memory device through the PMDK

                        libpmemblk library.
 
                **dev-dax**
                        Read and write using device DAX to a persistent memory device (e.g.,
                        libpmemblk library.
 
                **dev-dax**
                        Read and write using device DAX to a persistent memory device (e.g.,

-                       /dev/dax0.0) through the NVML libpmem library.
+                       /dev/dax0.0) through the PMDK libpmem library.

 
                **external**
                        Prefix to specify loading an external I/O engine object file. Append
 
                **external**
                        Prefix to specify loading an external I/O engine object file. Append


@@ -1875,7 +1875,7 @@ I/O engine
 
                **libpmem**
                        Read and write using mmap I/O to a file on a filesystem
 
                **libpmem**
                        Read and write using mmap I/O to a file on a filesystem

-                       mounted with DAX on a persistent memory device through the NVML
+                       mounted with DAX on a persistent memory device through the PMDK

                        libpmem library.
 
 I/O engine specific parameters
                        libpmem library.
 
 I/O engine specific parameters


@@ -2311,6 +2311,14 @@ I/O replay
        still respecting ordering. The result is the same I/O pattern to a given
        device, but different timings.
 
        still respecting ordering. The result is the same I/O pattern to a given
        device, but different timings.
 

+.. option:: replay_time_scale=int
+
+       When replaying I/O with :option:`read_iolog`, fio will honor the
+       original timing in the trace. With this option, it's possible to scale
+       the time. It's a percentage option, if set to 50 it means run at 50%
+       the original IO rate in the trace. If set to 200, run at twice the
+       original IO rate. Defaults to 100.
+

 .. option:: replay_redirect=str
 
        While replaying I/O patterns using :option:`read_iolog` the default behavior
 .. option:: replay_redirect=str
 
        While replaying I/O patterns using :option:`read_iolog` the default behavior


@@ -2627,18 +2635,6 @@ Verification
        previously written file. If the data direction includes any form of write,
        the verify will be of the newly written data.
 
        previously written file. If the data direction includes any form of write,
        the verify will be of the newly written data.
 

-.. option:: verifysort=bool
-
-       If true, fio will sort written verify blocks when it deems it faster to read
-       them back in a sorted manner. This is often the case when overwriting an
-       existing file, since the blocks are already laid out in the file system. You
-       can ignore this option unless doing huge amounts of really fast I/O where
-       the red-black tree sorting CPU time becomes significant. Default: true.
-
-.. option:: verifysort_nr=int
-
-       Pre-load and sort verify blocks for a read workload.
-

 .. option:: verify_offset=int
 
        Swap the verification header with data somewhere else in the block before
 .. option:: verify_offset=int
 
        Swap the verification header with data somewhere else in the block before


@@ -2935,7 +2931,8 @@ Measurements and reporting
 
        Define the set of CPUs that are allowed to handle online log compression for
        the I/O jobs. This can provide better isolation between performance
 
        Define the set of CPUs that are allowed to handle online log compression for
        the I/O jobs. This can provide better isolation between performance

-       sensitive jobs, and background compression work.
+       sensitive jobs, and background compression work. See
+       :option:`cpus_allowed` for the format used.

 
 .. option:: log_store_compressed=bool
 
 
 .. option:: log_store_compressed=bool