PostgreSQL DBA(90) - Linux(stress-ng簡介)
安裝很簡單,在CentOS下,通過yum -y install stress-ng即可安裝此工具.
NAME stress-ng - a tool to load and stress a computer system stress-ng是計算機系統進行壓力測試的工具. SYNOPSIS stress-ng [OPTION [ARG]] ... 使用方法:stress-ng [OPTION [ARG]] ... DESCRIPTION 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 var‐ ious operating system kernel interfaces. stress-ng also has a wide range of CPU specific stress tests that exercise floating point, integer, bit manipulation and control flow. 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 hard‐ ware. 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 appropriate 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; speci‐ fying a negative or zero value will select the number of processors available as defined by sysconf(_SC_NPROCESSORS_CONF). stress-ng提供了N中途徑對系統進行測試.該工具可執行計算機的各種物理子系統(如CPU/記憶體/網路等) 以及各種OS核心介面.stress-ng有大量的CPU壓力測試方法,包括測試浮點數/整數/位運算和控制流程等. stress-ng的最初目的是給機器加壓,通過使系統過載來發現OS的bug.要注意的是,stress-ng在設計不良 的系統中執行可能會系統當機. OPTIONS General stress-ng control options: ... 詳細可參考stress-ng手冊. EXAMPLES 使用樣例 stress-ng --vm 8 --vm-bytes 80% -t 1h run 8 virtual memory stressors that combined use 80% of the available mem‐ ory for 1 hour. Thus each stressor uses 10% of the available memory. 執行8個虛擬的記憶體壓測器,合計使用80%的可用記憶體,持續時間1小時,每個壓測器約10%的可用記憶體. stress-ng --cpu 4 --io 2 --vm 1 --vm-bytes 1G --timeout 60s runs for 60 seconds with 4 cpu stressors, 2 io stressors and 1 vm stressor using 1GB of virtual memory. stress-ng --iomix 2 --iomix-bytes 10% -t 10m runs 2 instances of the mixed I/O stressors using a total of 10% of the available file system space for 10 minutes. Each stressor will use 5% of the available file system space. stress-ng --cpu 8 --cpu-ops 800000 runs 8 cpu stressors and stops after 800000 bogo operations. stress-ng --sequential 2 --timeout 2m --metrics run 2 simultaneous instances of all the stressors sequentially one by one, each for 2 minutes and summarise with performance metrics at the end. stress-ng --cpu 4 --cpu-method fft --cpu-ops 10000 --metrics-brief run 4 FFT cpu stressors, stop after 10000 bogo operations and produce a summary just for the FFT results. stress-ng --cpu 0 --cpu-method all -t 1h run cpu stressors on all online CPUs working through all the available CPU stressors for 1 hour. stress-ng --all 4 --timeout 5m run 4 instances of all the stressors for 5 minutes. stress-ng --random 64 run 64 stressors that are randomly chosen from all the available stressors. stress-ng --cpu 64 --cpu-method all --verify -t 10m --metrics-brief run 64 instances of all the different cpu stressors and verify that the computations are correct for 10 minutes with a bogo operations summary at the end. stress-ng --sequential 0 -t 10m run all the stressors one by one for 10 minutes, with the number of instances of each stressor matching the number of online CPUs. stress-ng --sequential 8 --class io -t 5m --times run all the stressors in the io class one by one for 5 minutes each, with 8 instances of each stressor running concurrently and show overall time util‐ isation statistics at the end of the run. stress-ng --all 0 --maximize --aggressive run all the stressors (1 instance of each per CPU) simultaneously, maximize the settings (memory sizes, file allocations, etc.) and select the most demanding/aggressive options. stress-ng --random 32 -x numa,hdd,key run 32 randomly selected stressors and exclude the numa, hdd and key stres‐ sors stress-ng --sequential 4 --class vm --exclude bigheap,brk,stack run 4 instances of the VM stressors one after each other, excluding the bigheap, brk and stack stressors stress-ng --taskset 0,2-3 --cpu 3 run 3 instances of the CPU stressor and pin them to CPUs 0, 2 and 3.
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