benchmark_io.sh
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benchmark_io.sh
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			#!/bin/bash

			SIZES='1 10 100'
			INSTANCES=$(echo -n c4science-app0{0..1}; echo -n " c4science-phd00")

			for s in $SIZES; do
			CMD_W="sync; dd if=/dev/zero of=/var/repo/test bs=1M count=$s oflag=dsync 2>&1"
			CMD_R="sysctl -w vm.drop_caches=3; dd if=/var/repo/test of=/dev/null bs=1M count=$s oflag=dsync 2>&1"
			echo "> Write ${s}M"
			for n in $INSTANCES; do
			echo -en " $n: "
			ssh $n "$CMD_W" 2> /dev/null \| grep copied \| awk '{print $6 " sec, ", $8, $9}'
			done

			echo "> Read ${s}M"
			for n in $INSTANCES; do
			echo -en " $n: "
			ssh $n "$CMD_R" 2> /dev/null \| grep copied \| awk '{print $6 " sec, ", $8, $9}'
			done
			done