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strace - Trace system calls and signals. A diagnostic, debugging and instructional userspace utility.
perf - Perf is a simple app monitoring solution paired with meaningful alerts.
htop - htop - an interactive process viewer for Unix. This is htop, an interactive process viewer for Unix systems. It is a text-mode application (for console or X terminals) and requires ncurses. Latest release: htop 2.
Sysdig - Sysdig is an open source, system-level exploration that capture system state and activity from a running Linux instance, then save, filter and analyze.
ltrace - ltrace intercepts and records dynamic library calls which are called by an executed process and the...
DTrace - DTrace is a performance analysis and troubleshooting tool for Solaris, Mac OS X and FreeBSD.