Monthly Archives: November 2016

Using “sysbench” to test memory performance

Sysbench is a powerful testing tool for CPU / Memory / Mysql etc. Three years ago, I used to test performance of MYSQL by using it. Yesterday, I used Sysbench to test memory bandwidth of my server. By using command:

It reported the memory bandwidth could reach 8.4GB/s, which… Read more »

Install CDH(Cloudera Distribution Hadoop) by Cloudera Manager

These days I was trying to install Cloudera-5.8.3 on my centos-7 machines, and here are some steps for operation and tips for trouble shooting: 0. If you are not in USA, the speed of network for accessing Cloudera Repository of RPMS(or Parcels) is desperately slow, thus we need to move… Read more »

Using Pig to join two tables and sort it

Having two tables: salary and employee´╝îwe can use Pig to find the most high-salary employees:

The result is: