Command line output is spuradic while running because fio replaces the
last line while updating the status of the process instead of replacing
the update string.
EXAMPLE:
consider the update string as following
Jobs: 1 (f=1): [m] [61.9% done] [112.8M/123.6M /s] [123 /125 iops] [eta
00m:08s]
however, if the command prompt's line buffer size is smaller than the
length of the update string, the update string gets separated into 2 lines:
Jobs: 1 (f=1): [m] [61.9% done] [112.8M/123.6M /s] [123 /125 iops]
[eta 00m:08s]
which means that on the next update string you write, after removing the
current line, you will end up with
Jobs: 1 (f=1): [m] [61.9% done] [112.8M/123.6M /s] [123 /125 iops]
Jobs: 1 (f=1): [m] [65.2% done] [112.8M/123.6M /s] [129 /150 iops]
[eta 00m:08s]
on the console output.... I thought this was a feature and was using it
to my advantage until I started receiving low throughput values which
started making my status update strings smaller than the line buffer
size resulting in a single line of output. In order to fix, you need to
remove a status update string with the equivalent length of the last
string written using \b.
example
status update="I am an update"
to remove you send "\b\b\b\b\b\b\b\b\b\b\b\b\b\b" to stdout
I would also like to make a feature request of a verbose option that
disables the replacement of output as described above as the output
information can be extremely useful in certain cases; in my case I would
like very high resolution output of the instantaneous throughput and not
a summary at the end.
Environment: windows
version:fio-2.0.7-9g5c3f
--
Russell Weber
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