Stress test a computer system in various selectable ways


stress-ng will stress test a computer system in various selectable ways. It was designed to exercise various physical subsystems of a computer as well as the various operating system kernel interfaces.
Stress-ng features:

* Over 240 stress tests
* 78 CPU specific stress tests that exercise floating point, integer, bit manipulation and control flow
* Over 20 virtual memory stress tests

stress-ng was originally intended to make a machine work hard and trip hardware issues such as thermal overruns as well as operating system bugs that only occur when a system is being thrashed hard. Use stress-ng with caution as some of the tests can make a system run hot on poorly designed hardware and also can cause excessive system thrashing which may be difficult to stop.

stress-ng can also measure test throughput rates; this can be useful to observe performance changes across different operating system releases or types of hardware. However, it has never been intended to be used as a precise benchmark test suite, so do NOT use it in this manner.

Running stress-ng with root privileges will adjust out of memory settings on Linux systems to make the stressors unkillable in low memory situations, so use this judiciously. With the apropriate privilege, stress-ng can allow the ionice class and ionice levels to be adjusted, again, this should be used with care.

One can specify the number of processes to invoke per type of stress test; specifying a negative or zero value will select the number of online processors as defined by sysconf(_SC_NPROCESSORS_ONLN).

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