From e8ae4b17bb1b17ac30730f940568f713ebe1cded Mon Sep 17 00:00:00 2001
From: Peter Wu <lekensteyn@gmail.com>
Date: Mon, 28 Oct 2013 10:56:16 +0100
Subject: build-time: benchmark compile times

This script stores compile times while compiling a kernel. It was used
to determine the temperature performance after changing thermal paste.
---
 build-time | 149 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 149 insertions(+)
 create mode 100755 build-time

(limited to 'build-time')

diff --git a/build-time b/build-time
new file mode 100755
index 0000000..19d26b8
--- /dev/null
+++ b/build-time
@@ -0,0 +1,149 @@
+#!/bin/bash
+# Watch CPU temperature while compiling
+#
+# Author: Peter Wu <lekensteyn@gmail.com>
+# Created: 2013-07-31
+
+GITREPO=${GITREPO:-$HOME/Linux-src/linux}
+SRCDIR=${SRCDIR:-/tmp/linux-src}
+BUILDDIR=${BUILDDIR:-/tmp/linux-build}
+LOGDIR=${LOGDIR:-.}
+
+for arg; do
+	# Clear all arguments in order to print usage message.
+	case $arg in
+	--help|-h)
+		set --
+		break
+		;;
+	esac
+	if ! [[ $arg -gt 0 ]]; then
+		echo "Invalid number: $arg" >&2
+		exit 1
+	fi
+done
+
+if [ $# -lt 2 ]; then
+	cat <<EOF
+Usage: $0 repetitions cores1 [cores2 ... coresN]
+
+Use at least three repetitions to get a reliable average. Specify a
+number of cores to test. For example, to compare a dual core against a
+quad core CPU, I used the following:
+
+    $0 3   4 8 12 16
+
+Timings and results will be written to stdout.
+
+The following environment vars are available:
+
+# Path to Linux git repository (to fetch sources from). Unused if
+# SRCDIR is given which contains a 'version' file.
+GITREPO=$GITREPO
+
+# Directory to build the kernel from. If there is no 'version' file,
+# the directory will be removed and created from sources in GITREPO.
+SRCDIR=$SRCDIR
+
+# Output directory for object files.
+BUILDDIR=$BUILDDIR
+
+# Directory to store temperature readings.
+LOGDIR=$LOGDIR
+EOF
+	exit 1
+fi
+
+# Begin logic
+
+if ! [ -e "$SRCDIR/version" ]; then
+	if [ -d "$SRCDIR/.git" ]; then
+		echo "$SRCDIR is a git repo, which I will not delete." >&2
+		echo "Create the 'version' file in the SRCDIR directory" >&2
+		echo "or specify a different target SRCDIR." >&2
+		exit 1
+	fi
+	rm -rf "$SRCDIR"
+	mkdir "$SRCDIR"
+	if ! (cd "$GITREPO" && git describe) > "$SRCDIR/version"; then
+		echo "$GITREPO is not a git repo? Aborting!" >&2
+		exit 1
+	fi
+	(cd "$GITREPO" && time git archive HEAD) | tar x -C "$SRCDIR"
+fi
+cat "$SRCDIR/version"
+
+mk() {
+	make -C "$SRCDIR" O="$BUILDDIR" "$@"
+}
+
+get_temps() {
+	cat /sys/devices/platform/coretemp.0/temp*_input |
+		tr '\n' '\t' | sed 's/\t$/\n/'
+}
+
+temp_logger() {
+	local name=$1
+	mkdir -p "$LOGDIR"
+	while sleep 1; do
+		get_temps
+	done > "$LOGDIR/$name"
+}
+
+run() {
+	local tag jobs sec1 sec2 logpid templog
+
+	tag=$1
+	jobs=$2
+	templog="temps-$tag-$jobs"
+
+	rm -rf "$BUILDDIR"
+	mkdir "$BUILDDIR"
+
+	mk defconfig >/dev/null 2>&1
+
+	echo
+	echo "Running $tag-$jobs"
+	temp_logger "$templog" & logpid=$!
+	time {
+		sec1=$(date +%s)
+		mk -j$jobs bzImage modules >/dev/null 2>&1
+		sec2=$(date +%s)
+		echo "jobs=$jobs  secs=$((sec2-sec1))"
+		echo -n "loadavg: "
+		cut -d\  -f1-3 /proc/loadavg
+	} 2>&1
+	kill $logpid; wait $logpid 2>/dev/null
+
+	# Very simple statistics
+	echo "Temperature (min / avg / max):"
+	awk '
+	{
+		for (i=0; i<NF; i++) {
+			sum[i] += $i / 1000;
+			if (max[i] < $i) max[i] = $i;
+			if (min[i] == "" || min[i] > $i) min[i] = $i;
+		}
+		count++;
+	}
+	END {
+		for (i in sum) {
+			avg = sum[i] / count;
+			print min[i] / 1000, "/", avg, "/", max[i] / 1000
+		}
+	}
+	' "$LOGDIR/$templog"
+}
+
+resdir="res-$(date +%Y%m%d-%H%M%S)"
+mkdir -v "$resdir"
+cd "$resdir"
+
+trials=$1; shift
+for ((trial_no=1; trial_no<=trials; trial_no++)); do
+	for jobs; do
+		run $trial_no $jobs
+	done
+done
+
+#rm -rf "$BUILDDIR" "$SRCDIR"
-- 
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