lttng-iolatencystats - Online in the Cloud

PROGRAM:

NAME

lttng-iolatencystats - LTTng analyses IO latency statistics

DESCRIPTION

usage: lttng-iolatencystats [-h] [-r REFRESH] [--gmt] [--skip-validation]

[--begin BEGIN] [--end END]
[--period-begin PERIOD_BEGIN] [--period-end PERIOD_END] [--period-begin-key
PERIOD_BEGIN_KEY] [--period-end-key PERIOD_END_KEY] [--period-key-value
PERIOD_KEY_VALUE] [--cpu CPU] [--timerange TIMERANGE] [-V] [--no-progress]
[--procname PROCNAME] [--tid TID] [--min MIN] [--max MAX] [--log] [--limit LIMIT]
[--top] [--stats] [--freq] [--freq-resolution FREQ_RESOLUTION] [--freq-uniform]
[--freq-series] [--usage] [--minsize MINSIZE] [--maxsize MAXSIZE] <path/to/trace>

The I/O command.

positional arguments:
<path/to/trace>
trace path

optional arguments:
-h, --help
show this help message and exit

-r REFRESH, --refresh REFRESH
Refresh period, with optional units suffix (default units: s)

--gmt Manipulate timestamps based on GMT instead of local time

--skip-validation
Skip the trace validation

--begin BEGIN
start time: hh:mm:ss[.nnnnnnnnn]

--end END
end time: hh:mm:ss[.nnnnnnnnn]

--period-begin PERIOD_BEGIN
Analysis period start marker event name

--period-end PERIOD_END
Analysis period end marker event name (requires --period-begin)

--period-begin-key PERIOD_BEGIN_KEY
Optional, list of event field names used to match period markers (default: cpu_id)

--period-end-key PERIOD_END_KEY
Optional, list of event field names used to match period marker. If none specified,
use the same --period-begin-key

--period-key-value PERIOD_KEY_VALUE
Optional, define a fixed key value to which a period must correspond to be
considered.

--cpu CPU
Filter the results only for this list of CPU IDs

--timerange TIMERANGE
time range: [begin,end]

-V, --version
show program's version number and exit

--no-progress
Don't display the progress bar

--procname PROCNAME
Filter the results only for this list of process names

--tid TID
Filter the results only for this list of TIDs

--min MIN
Filter out durations shorter than min usec

--max MAX
Filter out durations longer than max usec

--log Output the I/O requests in chronological order

--limit LIMIT
Limit to top X (default = 10)

--top Output the top I/O latencies by category

--stats
Output the I/O latency statistics

--freq Output the I/O latency frequency distribution

--freq-resolution FREQ_RESOLUTION
Frequency distribution resolution (default 20)

--freq-uniform
Use a uniform resolution across distributions

--freq-series
Consolidate frequency distribution histogram as a single one

--usage
Output the I/O usage

--minsize MINSIZE
Filter out, I/O operations working with less that minsize bytes

--maxsize MAXSIZE
Filter out, I/O operations working with more that maxsize bytes

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