stress-ng vs y-cruncher

stress-ng is a free utility for loading computer subsystems and operating system kernel interfaces with stress tests. Its project lists more than 390 tests, including suites for CPU, virtual memory, filesystems, and memory or CPU caches. CPU tests exercise floating-point, integer, bit-manipulation, and control-flow operations. Listed architecture coverage includes ARM, x86-64, RISC-V, MIPS, Power, SPARC, and s390x. The project originally aimed to reveal hardware problems such as thermal overruns and operating system bugs under heavy load. stress-ng can report test throughput to help observe performance changes between operating system releases or hardware types, but the project says it is not a precise benchmark suite. Some tests may heat poorly designed hardware or create excessive system thrashing that is hard to stop. On Linux, running as root adjusts out-of-memory settings so stressors can become unkillable in low-memory conditions; the README advises careful use. The project documents Docker snapshots and installation on recent Ubuntu releases through its PPA. It is licensed under GPL-2.0 and costs nothing.

y-cruncher calculates Pi and other mathematical constants to trillions of digits, and also serves as a multithreaded benchmark and stress-testing program for overclockers and hardware enthusiasts. For most constants, it uses separate algorithms to compute and verify results. Its multithreading uses modern multi-core processors without significantly increasing memory usage, and it supports SIMD instruction sets such as SSE, AVX and AVX512. For computations that exceed available memory, y-cruncher manages swap space and can use multiple drives for disk swapping. It can detect and correct minor errors attributed to hardware instability or software bugs. Windows and Linux downloads are available; the listed requirements are Windows 8 or later, 64-bit Linux, and an x86 or x64 processor. The Linux static build lacks TBB and NUMA binding, while the dynamic build supports all features but is less portable. The free plan permits non-commercial and academic use; commercial-purpose licensing may be available by contacting the developer. Major algorithm redesigns and rewrites are on hiatus, though maintenance and some processor optimizations continue.