3 # Copyright 2012 the V8 project authors. All rights reserved.
4 # Redistribution and use in source and binary forms, with or without
5 # modification, are permitted provided that the following conditions are
8 # * Redistributions of source code must retain the above copyright
9 # notice, this list of conditions and the following disclaimer.
10 # * Redistributions in binary form must reproduce the above
11 # copyright notice, this list of conditions and the following
12 # disclaimer in the documentation and/or other materials provided
13 # with the distribution.
14 # * Neither the name of Google Inc. nor the names of its
15 # contributors may be used to endorse or promote products derived
16 # from this software without specific prior written permission.
18 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28 # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 ########## Global variable definitions
32 # Ensure that <your CPU clock> / $SAMPLE_EVERY_N_CYCLES < $MAXIMUM_SAMPLE_RATE.
33 MAXIMUM_SAMPLE_RATE=10000000
34 SAMPLE_EVERY_N_CYCLES=10000
35 SAMPLE_RATE_CONFIG_FILE="/proc/sys/kernel/perf_event_max_sample_rate"
36 KERNEL_MAP_CONFIG_FILE="/proc/sys/kernel/kptr_restrict"
42 usage: $0 <benchmark_command>
44 Executes <benchmark_command> under observation by the kernel's "perf" \
45 framework, then calls the low level tick processor to analyze the results.
49 if [ $# -eq 0 ] || [ "$1" == "-h" ] || [ "$1" == "--help" ] ; then
54 ########## Actual script execution
56 ACTUAL_SAMPLE_RATE=$(cat $SAMPLE_RATE_CONFIG_FILE)
57 if [ "$ACTUAL_SAMPLE_RATE" -lt "$MAXIMUM_SAMPLE_RATE" ] ; then
58 echo "Setting appropriate maximum sample rate..."
59 echo $MAXIMUM_SAMPLE_RATE | sudo tee $SAMPLE_RATE_CONFIG_FILE
62 ACTUAL_KERNEL_MAP_RESTRICTION=$(cat $KERNEL_MAP_CONFIG_FILE)
63 if [ "$ACTUAL_KERNEL_MAP_RESTRICTION" -ne "0" ] ; then
64 echo "Disabling kernel address map restriction..."
65 echo 0 | sudo tee $KERNEL_MAP_CONFIG_FILE
68 echo "Running benchmark..."
69 perf record -R -e cycles -c $SAMPLE_EVERY_N_CYCLES -f -i $@ --ll-prof