rate_submit: synchronize accesses to io_u_queue->nr

[fio.git] / HOWTO

diff --git a/HOWTO b/HOWTO
index 7bbd589838ed5dc3c4f9a6cb27e1e620c75a8e3d..0c5b7109df30c55c35bbc2d8441be0ee97d3ecb8 100644 (file)
--- a/HOWTO
+++ b/HOWTO
@@ -194,7 +194,10 @@ Command line options
        Force a full status dump of cumulative (from job start) values at `time`
        intervals. This option does *not* provide per-period measurements. So
        values such as bandwidth are running averages. When the time unit is omitted,
-       `time` is interpreted in seconds.
+       `time` is interpreted in seconds. Note that using this option with
+       ``--output-format=json`` will yield output that technically isn't valid
+       json, since the output will be collated sets of valid json. It will need
+       to be split into valid sets of json after the run.
 
 .. option:: --section=name