fio: add libpmem engine

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index e510e18c4c782a3335f6edaf29fed89799b9445c..dce96bcd8103f075d56b21173659f3061f6600b1 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -1464,7 +1464,7 @@ Buffers and memory
        followed by the remaining zeroed. With this set to some chunk size smaller
        than the block size, fio can alternate random and zeroed data throughout the
        I/O buffer. This is particularly useful when bigger block sizes are used
-       for a job.
+       for a job. Defaults to 512.
 
 .. option:: buffer_pattern=str
 
@@ -1820,6 +1820,11 @@ I/O engine
                        set  `filesize` so that all the accounting still occurs, but no
                        actual I/O will be done other than creating the file.
 
+               **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
+                       libpmem library.
+
 I/O engine specific parameters
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~