One of my client runs dedicated NS1 and NS2 to host more than 3000+ domains. Recently they upgraded their servers to latest Dual Core Dual AMD server with CentOS 5.0 and BIND server. By default BIND / named will try to determine the number of CPUs present and create one thread per CPU. If it [...]
Q. I would like to restrict number of CPU activated for some software licensing issues under Linux kernel 2.6.xx.. How can I limit the number of CPUs activated in SMP mode? A. Pass a special parameter called maxcpus to kernel. It specify maximum number of processors that an SMP Linux kernel should make use of. [...]
When you are using SMP (Symmetric MultiProcessing) you might want to override the kernel’s process scheduling and bind a certain process to a specific CPU(s). But what is CPU affinity? CPU affinity is nothing but a scheduler property that “bonds” a process to a given set of CPUs on the SMP system. The Linux scheduler [...]
Whenever a Linux system CPU is occupied by a process, it is unavailable for processing other requests. Rest of pending requests must wait till CPU is free. This becomes a bottleneck in the system. Following command will help you to identify CPU utilization, so that you can troubleshoot CPU related performance problems.