Provide a system ID to identify the host running test, the PV version, and a run ID for the whole test, as three separate fields in each output line, for easier processing later.
This commit is contained in:
Andrew Wood
@@ -4,7 +4,9 @@
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# multiple times, then calculate the mean and standard deviation for each
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# set of measurements.
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#
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# The report is written to stdout as tab-separated values.
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# The report is written to stdout as tab-separated values, each line
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# prefixed with an opaque system ID (based on "uname -a"), the PV version
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# expressed as an integer, and a run ID based on the start date and time.
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#
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# Takes a path to a pv binary as an argument.
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@@ -12,8 +14,8 @@ pv="$1"
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test -n "${pv}" || pv='pv'
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rounds='10' # how many rounds of measurements to take
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testFileMB='256' # size of each of the test files in MiB
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testZeroesMB='1024' # amount of /dev/zero data to use in MiB
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testFileMB='256' # max size of each of the test files, in MiB
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testZeroesMB='1024' # amount of /dev/zero data to use, in MiB
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# Use /dev/shm for workspace if possible to eliminate disk I/O as a factor.
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if test -d /dev/shm && mountpoint -q /dev/shm; then
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@@ -26,22 +28,23 @@ while test ${testFileMB} -gt 4; do
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testFileMB=$((testFileMB/2))
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done
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# Write an output line of up to 5 arguments, prefixed with a system ID and
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# Write an output line of up to 7 arguments, prefixed with a system ID and
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# the current time.
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outputLine () {
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test -n "${sysId}" || sysId="$({ uname -a; ${pv} --version; } | md5sum | awk '{print $1}')"
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printf '%s\t%s\t%s\t%s\t%s\t%s\t%s\n' "${sysId}" "$(date +%Y-%m-%dT%H:%M:%S)" "$1" "$2" "$3" "$4" "$5"
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test -n "${sysId}" || sysId="$(uname -a | md5sum | cut -b1-7)"
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test -n "${pvId}" || pvId="$(${pv} --version | awk 'FNR==1{print $2}' | awk -F . '{print 1000000*$1+1000*$2+$3}')"
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test -n "${runId}" || runId="$(date '+%Y%m%d%H%M%S')"
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printf '%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\t%s\n' "${sysId}" "${pvId}" "${runId}" "$1" "$2" "$3" "$4" "$5" "$6" "$7"
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}
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# Write a line of results with the heading $1, reading the times from
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# ${workDir}/times and deriving the rate from the elapsed time (from
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# ${workDir}/elapsed, or the real time from ${workDir}/times if that's not
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# present) and the size written in ${workDir}/size. Removes those three
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# files in the process.
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# Write a line of results for measurement $1 (prefixed with ${thisRound} and
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# a hash of $1), reading the times from ${workDir}/times and deriving the
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# rate from the elapsed time (from ${workDir}/elapsed, or the real time from
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# ${workDir}/times if that's not present) and the size written in
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# ${workDir}/size. Removes those three files in the process.
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#
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# The heading is prefixed with (${thisRound}) in the output (which round of
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# measurements this is), and the results without that prefix are spooled to
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# ${workDir}/results for later analysis.
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# The results without the prefix are spooled to ${workDir}/results for later
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# analysis.
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resultsLine () {
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testTimeReal="$(awk '$1=="real" {print $2}' "${workDir}/times")"
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testTimeUser="$(awk '$1=="user" {print $2}' "${workDir}/times")"
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@@ -51,21 +54,26 @@ resultsLine () {
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testRate="$(awk -v t="${testTimeReal}" '{if (t>0) { printf "%.3f\n", $1/t } else { print "-" }}' < "${workDir}/size")"
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test -n "${testRate}" || testRate='-'
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rm -f "${workDir}/elapsed" "${workDir}/times" "${workDir}/size"
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outputLine "(${thisRound}) $1" "${testRate}" "${testTimeReal}" "${testTimeUser}" "${testTimeSystem}"
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outputLine "${thisRound}" "$(printf '%s\n' "$1" | md5sum | cut -b1-7)" "${testRate}" "${testTimeReal}" "${testTimeUser}" "${testTimeSystem}" "$1"
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printf '%s\t%s\t%s\t%s\t%s\n' "$1" "${testRate}" "${testTimeReal}" "${testTimeUser}" "${testTimeSystem}" >> "${workDir}/results"
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}
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# Run $2 in a shell under "time -p", writing $1 to ${workDir}/size and the
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# Run $2 in a shell under "time", writing $1 to ${workDir}/size and the
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# times to ${workDir}/times. If measurable, the elapsed real time is
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# written with greater precision to ${workDir}/elapsed, otherwise that file
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# is removed.
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captureTimes () {
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printf '%s\n' "$1" > "${workDir}/size"
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t0="$(date '+%s.%N' 2>/dev/null)"
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{ time -p sh -c "{ $2; } 2>&3"; } 3>&2 2>"${workDir}/times"
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(
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TIMEFORMAT="real %3R
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user %3U
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sys %3S"
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time sh -c "{ $2; } 2>&3"
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) 3>&2 2>"${workDir}/times"
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t1="$(date '+%s.%N' 2>/dev/null)"
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if test -n "${t0}" && test -n "${t1}"; then
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awk -v "a=${t0}" -v b="${t1}" 'BEGIN{printf "%.6f\n", t1-t0}' < /dev/null > "${workDir}/elapsed"
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awk -v "t0=${t0}" -v "t1=${t1}" 'BEGIN{printf "%.6f\n", t1-t0}' < /dev/null > "${workDir}/elapsed"
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else
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rm -f "${workDir}/elapsed"
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fi
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@@ -92,7 +100,6 @@ outputLine 'System OS' "$(uname -o)"
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outputLine 'PV path' "${pv}"
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outputLine 'PV version' "$(${pv} -V | awk 'FNR==1 {print $2}')"
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outputLine 'Test file size (MB)' "${testFileMB}"
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outputLine 'Raw measurement' 'MiB/sec' 'Real time' 'User CPU time' 'System CPU time'
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# Generate two files of random data.
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dd if='/dev/urandom' of="${workDir}/file1" bs=1048576 count="${testFileMB}" 2>/dev/null
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@@ -185,6 +192,7 @@ gatherMeasurements () {
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}
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# Run several rounds of measurements.
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outputLine '#' 'ID' 'MiB/sec' 'Real time' 'User CPU time' 'System CPU time' 'Raw measurement'
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thisRound=0
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while test ${thisRound} -lt ${rounds}; do
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thisRound=$((1+thisRound))
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@@ -195,29 +203,31 @@ done
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# deviation of each field.
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awk -F "\t" '{print $1}' < "${workDir}/results" > "${workDir}/measurement-types"
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true > "${workDir}/measurement-types-used"
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outputLine 'Aggregated measurement' 'MiB/sec' 'Real time' 'User CPU time' 'System CPU time'
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outputLine 'μ/σ' 'ID' 'MiB/sec' 'Real time' 'User CPU time' 'System CPU time' 'Aggregated measurement'
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{
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while read -r measurement; do
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# Skip this type of measurement if already processed.
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grep -Fqx "${measurement}" "${workDir}/measurement-types-used" && continue
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printf '%s\n' "${measurement}" >> "${workDir}/measurement-types-used"
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# Hash the measurement name.
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measurementHash="$(printf '%s\n' "${measurement}" | md5sum | cut -b1-7)"
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# Separate out this measurement type's results.
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awk -F "\t" -v "m=${measurement}" '$1==m {print}' < "${workDir}/results" \
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> "${workDir}/measurements"
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# Calculate the mean of each field.
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awk -F "\t" -v fieldcount=5 \
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awk -F "\t" -v "h=${measurementHash}" -v fieldcount=5 \
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'BEGIN { samples=0 }
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{ m=$1; samples++; for (field=1; field<=fieldcount; field++) { total[field] += $(1+field) } }
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END { printf "%s %s", "μ", m; for (field=1; field<=fieldcount; field++) { printf "\t%.3f", total[field]/samples }; printf "\n" }' \
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END { printf "%s\t%s", "μ", h; for (field=1; field<=fieldcount; field++) { printf "\t%.3f", total[field]/samples }; printf "\t%s\n", m }' \
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< "${workDir}/measurements" > "${workDir}/mean"
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# Calculate the standard deviation of each field.
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cat "${workDir}/mean" "${workDir}/measurements" \
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| awk -F "\t" -v fieldcount=5 \
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| awk -F "\t" -v "h=${measurementHash}" -v "m=${measurement}" -v fieldcount=5 \
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'BEGIN { samples=0 }
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FNR==1 { for (field=1; field<=fieldcount; field++) { mean[field] += $(1+field) } }
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FNR>1 { m=$1; samples++; for (field=1; field<=fieldcount; field++) { variance=$(1+field)-mean[field]; sum_variance_squared[field] += (variance*variance) } }
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END { printf "%s %s", "σ", m; for (field=1; field<=fieldcount; field++) { printf "\t%.3f", sqrt(sum_variance_squared[field]/samples) }; printf "\n" }' \
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FNR==1 { for (field=1; field<=fieldcount; field++) { mean[field] += $(2+field) } }
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FNR>1 { samples++; for (field=1; field<=fieldcount; field++) { variance=$(1+field)-mean[field]; sum_variance_squared[field] += (variance*variance) } }
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END { printf "%s\t%s", "σ", h; for (field=1; field<=fieldcount; field++) { printf "\t%.3f", sqrt(sum_variance_squared[field]/samples) }; printf "\t%s\n", m }' \
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> "${workDir}/stddev"
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sed "s!^!${sysId}\t$(date +%Y-%m-%dT%H:%M:%S)\t!" "${workDir}/mean" "${workDir}/stddev"
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sed "s!^!${sysId}\t${pvId}\t${runId}\t!" "${workDir}/mean" "${workDir}/stddev"
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done
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} < "${workDir}/measurement-types"
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