Tuning Guidelines

Performance tuning is to adjust the hardware, OS, and applications of a computer system based on an in-depth understanding of the system to maximum the performance and meet the service requirements. Observe the following guidelines when tuning the performance: The guidelines are as follows:

• During performance analysis, use performance analysis tools such as nmon to analyze system resource bottlenecks from multiple aspects. The poor system performance may not be caused by the system itself but by other factors.
• To accurately identify performance bottlenecks, adjust only one parameter at a time. Multiple parameters can affect performance. For example, during HBase tuning, BulkLoad performance may be influenced by factors such as the region size or the number of map tasks. If more than one parameter is adjusted at a time, it is difficult to determine which parameter is responsible for the performance change.
• During system performance analysis, the performance analysis tool occupies certain system resources, such as CPU and memory resources. The running of the analysis tool may cause a more serious resource bottleneck in some aspects of the system.