| #!/bin/sh |
| |
| # Measure I/O latency once, return data in InfluxDB format |
| # |
| # Run one ioping command for read, and one for write. |
| # Each one sends 3 requests and reports the minimum time, in nanoseconds. |
| # (Because of limitations of ioping, we can't just send one request and get |
| # the number back in the batch format. Additionally, the number seems to be |
| # fluctuating quite a bit so taking the smallest number out of 3 requests is |
| # stabilising it a bit.) |
| |
| |
| set -e |
| |
| [ x"$1" = x ] && echo "$0 takes a path as a first argument" && exit 1 |
| |
| # Try to run in high priority to avoid slow-downs because of |
| # factors other than I/O. |
| renice -n -10 -p $$ >/dev/null 2>&1 || true |
| |
| |
| rlatency="$(ioping -B -k -c 3 -i 0.1 "$1" | cut -d " " -f 5)" |
| wlatency="$(ioping -B -k -c 3 -i 0.1 -W "$1" | cut -d " " -f 5)" |
| |
| printf "ioping,path=$1 read_latency_ns=%u,write_latency_ns=%u\n" \ |
| $rlatency $wlatency |
