A python script using BPF to log I/O latency.
This tool fits in the collection of bcc tools where some script to measure I/O requests already exist,
however bioslow lets you specify a threshold and logs all I/O requests which take longer than that.
usage: bioslow [-h] [-t THRESHOLD] [-l LOGFILE] [-u {us,ms,s}]
Log slow I/O operations over a given threshold
optional arguments:
-h, --help show this help message and exit
-t THRESHOLD, --threshold THRESHOLD
log requests which took longer than this (default: 1µs)
-l LOGFILE, --logfile LOGFILE
log to a given file instead of stdout
-u {us,ms,s}, --unit {us,ms,s}
unit of threshold and reported times. Can be 'us', 'ms' or 's'
examples:
./bioslow # print latency of I/O operations
./bioslow -t 10 # print I/O operations longer than 10us
./bioslow -t 100 -u ms # print I/O operations longer than 100ms
./bioslow -l foo.log # log to a file instread of stdout