%mem Ratio of the process’s resident set size to the physical memory on the machine, expressed as a percentage.Currently, it is the CPU time used divided by the time the process has been running (cputime/realtime ratio), expressed as a percentage.
%cpu CPU utilization of the process in “#.#” format. That is, it selects processes that are children of those listed in pidlist. This selects the processes with a parent process ID in pidlist. Format is a single argument in the form of a blank-separated or comma-separated list, which offers a way to specify individual output columns. Option of ps allows to specify the output format. All of this is wrapped in an intuitive, easy to use interface that makes sense for LAN-sized installations up to complex networks with thousands of devices.Explaining the command and all the options users: Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. Cacti is a complete network graphing solution designed to harness the power of RRDTool’s data storage and graphing functionality. A default installation provides a lot of graphs with almost no work. Munin is a networked resource monitoring tool that can help analyze resource trends and “what just happened to kill our performance?” problems. Ganglia is a scalable distributed monitoring system for high-performance computing systems such as clusters and Grids. It marked the start of a new generation of monitoring tools, making it easier than ever to store, retrieve, share, and visualize time-series data. Teams use Graphite to track the performance of their websites, applications, business services, and networked servers. Graphite is an enterprise-ready monitoring tool that runs equally well on cheap hardware or Cloud infrastructure. collectd – The system statistics collection daemon.
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