Centos6下通过 oprofile分析CPU性能
2014-01-18 10:55:15 bobpen 阅读数 2218更多 分类专栏: linux环境
Centos 6.4 x86_64
oprofile-0.9.9
oprofile安装
#wget http://ncu.dl.sourceforge.net/project/oprofile/oprofile/oprofile-0.9.9/oprofile-0.9.9.tar.gz
#tar -zxvf oprofile-0.9.9.tar.gz
#cd oprofile-0.9.9
#./configure
#make
#make install
oprofile使用
常用命令:
使用oprofile检测CPU,需要经过初始化、启动、导出数据、查看结果四个步骤。
初始化
opcontrol --no-vmlinux : oprofile启动后,不记录内核模块、内核代码相关统计数据
opcontrol --init : 加载oprofile模块、oprofile驱动程序
oprofile控制
opcontrol --start : 指示oprofile启动检测
opcontrol --dump : 指示将oprofile检测到的数据写入文件
opcontrol --reset : 清空之前检测的数据记录
opcontrol --h : 关闭oprofile进程
查看结果
opreport :默认查看oprofile检测结果
opreport -l : 以函数的角度显示检测结果
opreport -l oprofile_test : 以函数的角度,针对oprofile_test进程显示检测结果
opannotate -s oprofile_test : 以代码的角度,针对oprofile_test进程显示检测结果
opannotate -s /lib64/libc-2.12.so : 以代码的角度,针对libc-2.4.so库显示检测结果
在oprofile安装完成后,第一步初始化oprofile
[root@compute oprofile-0.9.9]# opcontrol --init
而后启动oprofile
[root@compute oprofile-0.9.9]# opcontrol --start --no-vmlinux
ATTENTION: Use of opcontrol is discouraged. Please see the man page for operf.
Using default event: CPU_CLK_UNHALTED:100000:0:1:1
Using 2.6+ OProfile kernel interface.
Using log file /var/lib/oprofile/samples/oprofiled.log
Daemon started.
Profiler running.
通过默认的方式查看CPU检测报告
[root@compute oprofile-0.9.9]# opreport | less
Using /var/lib/oprofile/samples/ for samples directory.
CPU: Intel Westmere microarchitecture, speed 2393.96 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
CPU_CLK_UNHALT...|
samples| %|
------------------
361031 83.4576 vmlinux
32789 7.5797 ext4
14667 3.3905 jbd2
10162 2.3491 no-vmlinux
3178 0.7346 libc-2.12.so
1798 0.4156 mptbase
1386 0.3204 oprofiled
1380 0.3190 oprofile
1267 0.2929 opannotate
1242 0.2871 libpython2.6.so.1.0
1102 0.2547 mptscsih
924 0.2136 bash
290 0.0670 ld-2.12.so
201 0.0465 kvm
159 0.0368 bnx2
159 0.0368 libstdc++.so.6.0.13
120 0.0277 sd_mod
通过函数方式显示检测结果
[root@compute oprofile-0.9.9]# opreport -l | less
CPU: Intel Westmere microarchitecture, speed 2393.96 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
samples % image name app name symbol name
107138 20.1679 no-vmlinux no-vmlinux /no-vmlinux
51905 9.7707 vmlinux vmlinux intel_idle
32789 6.1723 ext4 ext4 /ext4
32755 6.1659 vmlinux vmlinux port_inb
21769 4.0978 vmlinux vmlinux copy_user_generic_string
16469 3.1002 vmlinux vmlinux __clear_user
14667 2.7609 jbd2 jbd2 /jbd2
13871 2.6111 vmlinux vmlinux native_sched_clock
8691 1.6360 vmlinux vmlinux get_page_from_freelist
5864 1.1039 vmlinux vmlinux find_busiest_group
5701 1.0732 vmlinux vmlinux mark_page_accessed
2894 0.5448 vmlinux vmlinux __schedule
2888 0.5436 vmlinux vmlinux __list_del_entry
2817 0.5303 vmlinux vmlinux menu_select
2772 0.5218 vmlinux vmlinux kmem_cache_alloc
2652 0.4992 vmlinux vmlinux __alloc_pages_slowpath
2478 0.4665 vmlinux vmlinux __wake_up_bit
2438 0.4589 vmlinux vmlinux __hrtimer_start_range_ns
2428 0.4571 vmlinux vmlinux kmem_cache_free
2262 0.4258 vmlinux vmlinux __list_add
下同编写简单代码消耗CPU,通过opannotate来了解CPU的占用情况,代码如下:
#vi test.c
int main()
{
int a = 0, b = 0;
for (; a < 1000000000; a++ )
{
b++;
}
}
#gcc -o oprofile_test test.c
执行该代码
#./oprofile_test &
将检测数据写入文件
#opcontrol --dump
查看该代码的CPU检测数据
[root@compute ~]# opreport -l oprofile_test
Using /var/lib/oprofile/samples/ for samples directory.
CPU: Intel Westmere microarchitecture, speed 2393.96 MHz (estimated)
Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
samples % symbol name
492407 100.000 main
通过opannotate查看代码层CPU的占用情况
[root@compute ~]# opannotate -s oprofile_test
Using /var/lib/oprofile/samples/ for session-dir
/*
* Command line: opannotate -s oprofile_test
*
* Interpretation of command line:
* Output annotated source file with samples
* Output all files
*
* CPU: Intel Westmere microarchitecture, speed 2393.96 MHz (estimated)
* Counted CPU_CLK_UNHALTED events (Clock cycles when not halted) with a unit mask of 0x00 (No unit mask) count 100000
*/
/*
* Total samples for file : "/root/test.c"
*
* 492407 100.000
*/
:int main()
:{ /* main total: 492407 100.000 */
: int a = 0, b = 0;
343285 69.7157 : for (; a < 1000000000; a++ )
: {
149122 30.2843 : b++;
: }
:}