commdand line output

[Rusty Weber <RWeber@fusionio.com>]

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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