oprofile抓不到采样数据问题和解决方法
April 1st, 2011
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原创文章,转载请注明: 转载自系统技术非业余研究
本文链接地址: oprofile抓不到采样数据问题和解决方法
最近有同学反映在某些新机器上做性能调优的时候, oprofile 有时抓不到数据,我之前也遇到这个情况,很是无语,今天特地验证了下。
# 我们的操作系统和机器配置大概是这样的: $sudo aspersa/summary # Aspersa System Summary Report ############################## Date | 2011-03-31 16:26:05 UTC (local TZ: CST +0800) Hostname | my031226.sqa.cm4 Uptime | 10:00, 4 users, load average: 0.00, 0.78, 5.29 System | Huawei Technologies Co., Ltd.; Tecal RH2285; vV100R001 (Main Server Chassis) Service Tag | 2102317716N0AA000062 Release | Red Hat Enterprise Linux Server release 5.4 (Tikanga) Kernel | 2.6.18-164.el5 Architecture | CPU = 64-bit, OS = 64-bit Threading | NPTL 2.5 Compiler | GNU CC version 4.1.2 20080704 (Red Hat 4.1.2-44). SELinux | Disabled # Processor ################################################## Processors | physical = 2, cores = 12, virtual = 24, hyperthreading = yes Speeds | 24x2400.151 Models | 24xIntel(R) Xeon(R) CPU X5670 @ 2.93GHz Caches | 24x12288 KB .. $sudo rm -f /root/.oprofile/daemonrc $sudo opcontrol --setup --no-vmlinux $sudo opcontrol --init $sudo opcontrol --reset $sudo opcontrol --start Using 2.6+ OProfile kernel interface. Using log file /var/lib/oprofile/samples/oprofiled.log Daemon started. Profiler running. $sudo opcontrol --status Daemon running: pid 9253 Separate options: none vmlinux file: none Image filter: none Call-graph depth: 0 #这里喝杯茶,让子弹飞一会儿 $sudo opcontrol --shutdown Stopping profiling. Killing daemon. $opreport opreport error: No sample file found: try running opcontrol --dump or specify a session containing sample files $tree /var/lib/oprofile/samples/current/ /var/lib/oprofile/samples/current/ 0 directories, 0 files
确实是没抓到sample文件!
经过无数次的分析和判断,再加上goolge大神的帮助,找到问题的根源了:
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