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最新评论
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zjhzwx1212:
为什么用threadLocal后,输出值是从20开始的,而定义 ...
j2ee的线程安全--threadlocal -
aeoluspu:
不错 mysql 测试部分感觉不详细
用sysbench(或者super-smack)测试mysql性能 -
nanPrivate:
有没有例子,只理论,实践起来还是不会啊
JMS可靠消息传送 -
lwclover:
一个网络工程师 装什么b
postfix 如何删除队列中的邮件 -
maimode:
我也欠缺不少啊
理想的计算机科学知识体系
文章列表
找出mysql中最大的表
- 博客分类:
- mysql/postgresql
SELECT concat(round(table_rows/1000000,2),'M',' rows'),concat(round(data_length/(1024*1024*1024),2),'G',' DATA'),concat(round(index_length/(1024*1024*1024),2),'G',' idx'),concat(round((data_length+index_length)/(1024*1024*1024),2),'G',' total_size'),concat(round(index_length/data_length,2),' idxratio ...
sysctl.conf
- 博客分类:
- 系统管理
fs.file-max=51200
net.core.netdev_max_backlog = 32768
net.core.somaxconn = 32768
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
#net.ipv4.tcp_timestamps = 0
#net.ipv4.tcp_tw_len = 1
net.ipv4.tcp_mem = 94500000 915000 ...
DNS
DNS记录,需要你到你的域名托管商那里进行设置或者你自己管理DNS服务器。不少域名托管商不支持txt记录或者不支持DKIM记录,所以你就无法使用SPF和DKIM的功能。
DNS的修改,需要48小时以上才能生效。
国内的万网是不支持 ...
http://wiki.secondlife.com/wiki/Message_Queue_Evaluation_Notes
http://www.westnet.com/~gsmith/content/linux-pdflush.htm
The Linux Page Cache and pdflush:
Theory of Operation and Tuning for Write-Heavy Loads
As you write out data ultimately intended for disk, Linux caches this information in an
area of memory called the page cache. You can find ...
http://www.linuxlinks.com/article/20101024141930129/ServerProvisioning.html
FAI
High quality tool for fully automatic installation of
Linux systems
xCAT
Extreme
Cluster Administration Toolkit
Spacewalk
Systems management software developed by Red Hat
Cobbler
OS
provi ...
最佳开源配置管理工具: Puppet
/ 提名:OpenQRM, Cfengine, Chef ,Bcfg2
优化ext3的mount选项
- 博客分类:
- 系统管理
defaults,commit=600,noatime,nodiratime
http://www.xasun.com/article/2a/1991$3.html
1.With the Xeon 5500 series processorsIntel has diverged from its traditional Symmetric Multiprocessing (SMP) architectureto a Non-Uniform Memory Access (NUMA) architecture.In a two-processor scenario, the Xeon5500 series processors are connected throug ...