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It now keeps track of I/O activity on a per-device basis (as well as a
cumulative system-wide view). ``I/O activity'' is defined as defined as
the time during which the device driver and device are activelty working
on at least one I/O. Here's a sample output:
==================== I/O Active Period Information ====================
DEV | # Live Avg. Act Avg. !Act % Live
---------- | ---------- ------------- ------------- ------
(254, 0) | 0 0.000000000 0.000000000 0.00
( 8, 17) | 0 0.000000000 0.000000000 0.00
( 8, 16) | 29 0.909596815 0.094646263 90.87
( 8, 33) | 0 0.000000000 0.000000000 0.00
( 8, 32) | 168 0.097848226 0.068231948 59.06
---------- | ---------- ------------- ------------- ------
Total Sys | 33 0.799808811 0.082334758 90.92
Also added a new btt -Z option that generates per-device and system-wide
I/O activity data that can be plotted.
Refer to the documentation updates (btt.1, btt.tex) for more information.
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btt_plot.py: Generate matplotlib plots for BTT generated data files
Files handled:
AQD - Average Queue Depth Running average of queue depths
BNOS - Block numbers accessed Markers for each block
Q2D - Queue to Issue latencies Running averages
D2C - Issue to Complete latencies Running averages
Q2C - Queue to Complete latencies Running averages
Usage:
btt_plot_aqd.py equivalent to: btt_plot.py -t aqd
btt_plot_bnos.py equivalent to: btt_plot.py -t bnos
btt_plot_q2d.py equivalent to: btt_plot.py -t q2d
btt_plot_d2c.py equivalent to: btt_plot.py -t d2c
btt_plot_q2c.py equivalent to: btt_plot.py -t q2c
Arguments:
[ -A | --generate-all ] Default: False
[ -L | --no-legend ] Default: Legend table produced
[ -o <file> | --output=<file> ] Default: <type>.png
[ -T <string> | --title=<string> ] Default: Based upon <type>
[ -v | --verbose ] Default: False
<data-files...>
The -A (--generate-all) argument is different: when this is specified,
an attempt is made to generate default plots for all 5 types (aqd, bnos,
q2d, d2c and q2c). It will find files with the appropriate suffix for
each type ('aqd.dat' for example). If such files are found, a plot for
that type will be made. The output file name will be the default for
each type. The -L (--no-legend) option will be obeyed for all plots,
but the -o (--output) and -T (--title) options will be ignored.
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