The memstat utility is useful to identify which executable(s), process(es) and shared libraries are consuming virtual memory. Its functionality is mostly similar to GNOME version, i.e., showing a real-time history of system resource usage, as well as a process list along with per-process CPU/memory consumption. While GNOME desktop has GNOME System Monitor, KDE desktop has its own counterpart: KDE System Monitor. You can scroll the (sorted) list of processes horizontally or vertically. It can report resident memory size (RSS), total program size in memory, library size, shared page size, and dirty page size for all running processes. The htop command is an ncurses-based interactive processor viewer which shows per-process memory usage in real time. It also offers a process view of CPU and memory usage. GNOME System Monitor is a GUI application that shows a short history of system resource utilization for CPU, memory, swap space and network. It shows a snapshot of total/free physical memory and swap space of the system, as well as used/free buffer space in the kernel. The free command is a quick and easy way to get an overview of memory usage gleaned from /proc/meminfo. Reported memory statistics include total/free memory, cached/buffer memory and committed virtual memory. It also offers a top-like view of processes (or users) along with their resource usage, so that system admin can tell which processes or users are responsible for system load. It shows a dynamically-updated summary of system resources (CPU, memory, network, I/O, kernel), with colorized warnings in case of high system load. The atop command is an ncurses-based interactive system and process monitor for terminal environments. Process-specific memory information is also available from /proc//statm and /proc//status $ cat /proc/meminfo From the amount of available/free physical memory to the amount of buffer waiting to be or being written back to disk, /proc/meminfo has everything you want to know about system memory usage. This dynamically updated virtual file is actually the source of information displayed by many other memory related tools such as free, top and ps tools. The simpliest method to check RAM usage is via /proc/meminfo. Here is a non-exhaustive list of GUI or command-line tools to choose from to check used and free memory on Linux platform. Different tools vary in terms of their monitoring granularity (e.g., system-wide, per-process, per-user), interface (e.g., GUI, command-line, ncurses) or running mode (e.g., interactive, batch mode). Naturally, Linux offers a wealth of options to monitor the usage of the precious memory resource. When it comes to optimizing the performance of a Linux system, physical memory is the single most important factor. What are the available GUI-based or command-line tools for checking current memory usage of Linux? Question: I would like to monitor memory usage on my Linux system.
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