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KVM与VMware的性能比较
结合网页http://www.linuxidc.com/Linux/2011-01/31755.htm等整理物理环境内存4G ,CPU4个,动态硬盘120GKVM:硬盘测试瞬间读取速度Timing cached reads: 23668 MB in 2.00 seconds = 11858.17 M...
分类:其他好文   时间:2014-07-22 23:10:12    阅读次数:528
几个常用ORACLE运维监控的SQL语句
1.消耗CPUSELECT a.CPU_TIME, --CPU时间 百万分之一(微秒) a.OPTIMIZER_MODE,--优化方式 a.EXECUTIONS,--执行次数 a.DISK_READS,--读盘次数 a.SHARABLE_MEM,--占用shared pool...
分类:数据库   时间:2014-05-16 04:07:52    阅读次数:419
Effective Java 66 Synchronize access to shared mutable data
When multiple threads share mutable data, each thread that reads or writes the data must perform synchronization. Without synchronization, there is no...
分类:数据库   时间:2014-05-01 09:14:25    阅读次数:506
Java Concurrent happens-before
happens-beforerelation on memory operations such as reads and writes of shared variables. The results of a write by one thread are guaranteed to be .....
分类:移动开发   时间:2014-04-29 16:38:32    阅读次数:511
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