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linux下perf工具初体验
背景
使用perf工具，来定位指令集的性能问题。
初体验
安装
- Ubuntu/Debian
sudo apt install linux-tools-$(uname -r) linux-tools-generic
- RHEL/CentOS
sudo yum install perf
确认安装情况
perf --version
结果
perf --version
perf version 4.18.0-348.7.1.el8_5.x86_64
支持普通用户使用
echo 0 > /proc/sys/kernel/perf_event_paranoid
或者修改文件 /etc/sysctl.conf如下：
kernel.perf_event_paranoid = 0
使用
perf 和 git 的使用类似，里面包含一组子命令，每个子命令有自己的参数。
支持的事件
列出所有事件
perf list
branch-instructions OR branches [Hardware event]
branch-misses [Hardware event]
bus-cycles [Hardware event]
cache-misses [Hardware event]
cache-references [Hardware event]
cpu-cycles OR cycles [Hardware event]
instructions [Hardware event]
ref-cycles [Hardware event]
alignment-faults [Software event]
bpf-output [Software event]
context-switches OR cs [Software event]
cpu-clock [Software event]
cpu-migrations OR migrations [Software event]
dummy [Software event]
emulation-faults [Software event]
major-faults [Software event]
minor-faults [Software event]
page-faults OR faults [Software event]
task-clock [Software event]
duration_time [Tool event]
L1-dcache-load-misses [Hardware cache event]
L1-dcache-loads [Hardware cache event]
L1-dcache-stores [Hardware cache event]
L1-icache-load-misses [Hardware cache event]
LLC-load-misses [Hardware cache event]
LLC-loads [Hardware cache event]
LLC-store-misses [Hardware cache event]
LLC-stores [Hardware cache event]
branch-load-misses [Hardware cache event]
branch-loads [Hardware cache event]
dTLB-load-misses [Hardware cache event]
dTLB-loads [Hardware cache event]
dTLB-store-misses [Hardware cache event]
dTLB-stores [Hardware cache event]
iTLB-load-misses [Hardware cache event]
iTLB-loads [Hardware cache event]
node-load-misses [Hardware cache event]
node-loads [Hardware cache event]
node-store-misses [Hardware cache event]
node-stores [Hardware cache event]
branch-instructions OR cpu/branch-instructions/ [Kernel PMU event]
branch-misses OR cpu/branch-misses/ [Kernel PMU event]
bus-cycles OR cpu/bus-cycles/ [Kernel PMU event]
cache-misses OR cpu/cache-misses/ [Kernel PMU event]
cache-references OR cpu/cache-references/ [Kernel PMU event]
cpu-cycles OR cpu/cpu-cycles/ [Kernel PMU event]
instructions OR cpu/instructions/ [Kernel PMU event]
mem-loads OR cpu/mem-loads/ [Kernel PMU event]
mem-stores OR cpu/mem-stores/ [Kernel PMU event]
ref-cycles OR cpu/ref-cycles/ [Kernel PMU event]
topdown-fetch-bubbles OR cpu/topdown-fetch-bubbles/ [Kernel PMU event]
topdown-recovery-bubbles OR cpu/topdown-recovery-bubbles/ [Kernel PMU event]
topdown-slots-issued OR cpu/topdown-slots-issued/ [Kernel PMU event]
topdown-slots-retired OR cpu/topdown-slots-retired/ [Kernel PMU event]
topdown-total-slots OR cpu/topdown-total-slots/ [Kernel PMU event]
cstate_core/c3-residency/ [Kernel PMU event]
cstate_core/c6-residency/ [Kernel PMU event]
cstate_core/c7-residency/ [Kernel PMU event]
cstate_pkg/c2-residency/ [Kernel PMU event]
cstate_pkg/c3-residency/ [Kernel PMU event]
cstate_pkg/c6-residency/ [Kernel PMU event]
cstate_pkg/c7-residency/ [Kernel PMU event]
intel_bts// [Kernel PMU event]
intel_pt// [Kernel PMU event]
msr/aperf/ [Kernel PMU event]
msr/cpu_thermal_margin/ [Kernel PMU event]
msr/mperf/ [Kernel PMU event]
msr/pperf/ [Kernel PMU event]
msr/smi/ [Kernel PMU event]
msr/tsc/ [Kernel PMU event]
power/energy-pkg/ [Kernel PMU event]
power/energy-ram/ [Kernel PMU event]
uncore_iio_free_running_0/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_0/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_0/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_0/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_0/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_0/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_0/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_0/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_0/ioclk/ [Kernel PMU event]
uncore_iio_free_running_0/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_0/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_0/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_0/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_0/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_0/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_0/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_0/util_out_port3/ [Kernel PMU event]
uncore_iio_free_running_1/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_1/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_1/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_1/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_1/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_1/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_1/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_1/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_1/ioclk/ [Kernel PMU event]
uncore_iio_free_running_1/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_1/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_1/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_1/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_1/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_1/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_1/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_1/util_out_port3/ [Kernel PMU event]
uncore_iio_free_running_2/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_2/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_2/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_2/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_2/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_2/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_2/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_2/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_2/ioclk/ [Kernel PMU event]
uncore_iio_free_running_2/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_2/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_2/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_2/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_2/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_2/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_2/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_2/util_out_port3/ [Kernel PMU event]
uncore_iio_free_running_3/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_3/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_3/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_3/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_3/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_3/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_3/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_3/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_3/ioclk/ [Kernel PMU event]
uncore_iio_free_running_3/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_3/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_3/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_3/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_3/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_3/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_3/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_3/util_out_port3/ [Kernel PMU event]
uncore_iio_free_running_4/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_4/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_4/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_4/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_4/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_4/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_4/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_4/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_4/ioclk/ [Kernel PMU event]
uncore_iio_free_running_4/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_4/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_4/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_4/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_4/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_4/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_4/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_4/util_out_port3/ [Kernel PMU event]
uncore_iio_free_running_5/bw_in_port0/ [Kernel PMU event]
uncore_iio_free_running_5/bw_in_port1/ [Kernel PMU event]
uncore_iio_free_running_5/bw_in_port2/ [Kernel PMU event]
uncore_iio_free_running_5/bw_in_port3/ [Kernel PMU event]
uncore_iio_free_running_5/bw_out_port0/ [Kernel PMU event]
uncore_iio_free_running_5/bw_out_port1/ [Kernel PMU event]
uncore_iio_free_running_5/bw_out_port2/ [Kernel PMU event]
uncore_iio_free_running_5/bw_out_port3/ [Kernel PMU event]
uncore_iio_free_running_5/ioclk/ [Kernel PMU event]
uncore_iio_free_running_5/util_in_port0/ [Kernel PMU event]
uncore_iio_free_running_5/util_in_port1/ [Kernel PMU event]
uncore_iio_free_running_5/util_in_port2/ [Kernel PMU event]
uncore_iio_free_running_5/util_in_port3/ [Kernel PMU event]
uncore_iio_free_running_5/util_out_port0/ [Kernel PMU event]
uncore_iio_free_running_5/util_out_port1/ [Kernel PMU event]
uncore_iio_free_running_5/util_out_port2/ [Kernel PMU event]
uncore_iio_free_running_5/util_out_port3/ [Kernel PMU event]
uncore_imc_0/cas_count_read/ [Kernel PMU event]
uncore_imc_0/cas_count_write/ [Kernel PMU event]
uncore_imc_0/clockticks/ [Kernel PMU event]
uncore_imc_1/cas_count_read/ [Kernel PMU event]
uncore_imc_1/cas_count_write/ [Kernel PMU event]
uncore_imc_1/clockticks/ [Kernel PMU event]
uncore_imc_2/cas_count_read/ [Kernel PMU event]
uncore_imc_2/cas_count_write/ [Kernel PMU event]
uncore_imc_2/clockticks/ [Kernel PMU event]
uncore_imc_3/cas_count_read/ [Kernel PMU event]
uncore_imc_3/cas_count_write/ [Kernel PMU event]
uncore_imc_3/clockticks/ [Kernel PMU event]
uncore_imc_4/cas_count_read/ [Kernel PMU event]
uncore_imc_4/cas_count_write/ [Kernel PMU event]
uncore_imc_4/clockticks/ [Kernel PMU event]
uncore_imc_5/cas_count_read/ [Kernel PMU event]
uncore_imc_5/cas_count_write/ [Kernel PMU event]
uncore_imc_5/clockticks/ [Kernel PMU event]
列出软件事件
$ perf list software
List of pre-defined events (to be used in -e):
alignment-faults [Software event]
bpf-output [Software event]
context-switches OR cs [Software event]
cpu-clock [Software event]
cpu-migrations OR migrations [Software event]
dummy [Software event]
emulation-faults [Software event]
major-faults [Software event]
minor-faults [Software event]
page-faults OR faults [Software event]
task-clock [Software event]
duration_time [Tool event]
查看实时CPU profile
sudo perf top