torvalds0310的博客_性能调优

Linux磁盘I/O调度算法杂谈

I/O 调度算法再各个进程竞争磁盘I/O 的时候担当了裁判的角色。他要求请求的次序和时机做最优化的处理，以求得尽可能最好的整体I/O 性能。在linux 下面列出4 种调度算法: CFQ (Completely Fair Queuing 完全公平的排队)(elevator=cfq)：这是默认算法，对于通用服务器来说通常是最好的选择。它试图均匀地分布对I/O 带宽的访问。在多媒体应用,

FCQ

Deadline

NOOP

Anticipatory

原创 2012-10-04 12:31:13 1268 阅读

PROC系列之---/proc/loadavg、/proc/pid/stat、/proc/pid/statm

该文件中的所有值都是从系统启动开始累计到当前时刻。该文件只给出了所有CPU的集合信息，不能该出每个CPU的信息。[root@localhost ~]# cat /proc/loadavg 4.61 4.36 4.15 9/84 5662每个值的含义为：参数解释lavg_1 (4.61) 1-分钟平均负载lavg_5 (4.36) 5-分钟平均负载lavg_15(4.15) 15-分钟平均负载nr

proc

loadavg

/proc/stat/

proc/pid/stat

转载精选 2012-08-23 18:59:34 959 阅读

Linux/Unix mpstat command

NAME mpstat - Report processors related statistics.SYNOPSIS mpstat [ -A ] [ -I { SUM | CPU | ALL } ] [ -u ] [ -P { cpu [,...] |

调优工具mpstat

Linux mpstat

unix mpstat

原创 2012-07-31 16:41:46 713 阅读

RedHat 系统监控工具

Red Hat Enterprise Linux comes with a variety of resource monitoring tools. While there are more than those listed here, these tools are representative in terms of functionality. T

redhat

oprofile

系统监控工具

原创 2012-07-31 14:22:25 797 阅读

Linux/Unix ifconfig command

Tool ifconfigThe "ifconfig" command allows the operating system to setup network interfaces and allow the user to view information about the configured network interfaces. Syntaxifconfig [-L] [-m

Linux

Unix

ifconfig

原创 2012-07-31 11:28:19 391 阅读

Linux/Unix rthtool command

Ethtool utility is used to view and change the ethernet device parameters. 1. List Ethernet Device Properties When you execute ethtool command with a device name, it displays the following informati

Linux

Unix

rthtool

原创 2012-07-31 11:20:45 571 阅读

Linux/Unix mii-tool command

mii-tool:linux下专门设置网卡工作模式的命令mii-tool --helpusage: mii-tool [-VvRrwl] [-A media,... | -F media] [interface ...] -V, --version &nbs

Linux

Unix

mii-tool

原创 2012-07-31 11:05:46 598 阅读

Linux/Unix lsof command

[root@redhat ~]# lsof --helplsof: illegal option character: -lsof: -e not followed by a file system path: "lp"lsof 4.78 latest revision: ftp://lsof.itap.purdue.edu/pub/tools/unix/lsof/ lates

linux lsof

Unix lsof

原创 2012-07-30 18:33:17 820 阅读

Linux/Unix iostat command

NAME iostat - Report Central Processing Unit (CPU) statistics and input/output statistics for devices and partitions.OPTIONS -c&

linux iostat

Unix iostat

原创 2012-07-30 17:39:41 375 阅读

Linux/Unux ipcs command

NAME ipcs - provide information on ipc facilitiesSYNOPSIS ipcs [ -asmq ] [ -tclup ] ipcs [ -

linux

unix

Linux ipcs

Unix ipcs

原创 2012-07-30 17:12:11 676 阅读

Linux/Unix Strace command

Linux super-duper admin tools: Strace In my LKCD and Kdump tutorials, I've mentioned a large number of sequels, including tutorials showing how to w

linux strace

unix strace

原创 2012-07-30 16:52:04 882 阅读

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Torvalds0310

Linux磁盘I/O调度算法杂谈

PROC系列之---/proc/loadavg、/proc/pid/stat、/proc/pid/statm

Linux/Unix mpstat command

RedHat 系统监控工具

Linux/Unix ifconfig command

Linux/Unix rthtool command

Linux/Unix mii-tool command

Linux/Unix lsof command

Linux/Unix iostat command

Linux/Unux ipcs command

Linux/Unix Strace command