系统技术非业余研究

在EUC-2010上rickard做了个报告，详细的解读了R14B读写锁优化的有效性，并且给出了benchmark, 详见这里 http://www.erlang.org/~rickard/euc-2010/。

优化的效果非常好，读写锁比NPTL内置的有好几倍的提升，我也来体验下。

我的测试是在Dell R815机器上测试的，以下是它的硬件配置.
获取的系统信息脚本这里下载。

# summary.sh
      Date | 2010-11-25 14:18:18 UTC (local TZ: CST +0800)
    Hostname | =i
      Uptime |  9:02,  7 users,  load average: 10.27, 15.74, 11.78
      System | Dell Inc.; PowerEdge R815; vNot Specified (<OUT OF SPEC>)
 Service Tag | 55SSW2X
     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 = 4, cores = 48, virtual = 48, hyperthreading = no
      Speeds | 48x1900.026
      Models | 48xAMD Opteron(tm) Processor 6168
      Caches | 48x512 KB
# Memory #####################################################
       Total | 62.92G
        Free | 57.33G
        Used | physical = 5.60G, swap = 420.00k, virtual = 5.60G
     Buffers | 100.19M
      Caches | 186.92M
        Used | 5.20G
  Swappiness | vm.swappiness = 0
 DirtyPolicy | vm.dirty_ratio = 40, vm.dirty_background_ratio = 10
...

详细的请查看Dell R815机器配置

我的测试是这样的：
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