kill process in linux

本文深入解析PS命令的使用技巧,通过示例展示如何使用PS-aux、grep、awk和xargs命令来筛选并终止指定进程,提高系统管理效率。
ps -aux|grep -ie ***|awk {'print $2'}|xargs -n 1 kill -9
### Out of Memory Kill Process Solution When encountering an out of memory situation where processes get killed by the system, several strategies can be employed to mitigate this issue and ensure smoother operation of applications. The Linux kernel includes a mechanism known as OOM Killer that automatically selects and terminates processes when physical RAM is exhausted[^3]. #### Adjusting Swappiness Parameter One approach involves modifying how aggressively the operating system swaps data between RAM and disk space. By adjusting the swappiness parameter, one can influence whether pages from inactive processes should more readily move into swap partitions rather than staying in main memory. The default value typically ranges around 60; lowering this number reduces swapping frequency: ```bash sysctl vm.swappiness=10 echo 'vm.swappiness=10' >> /etc/sysctl.conf ``` This adjustment helps prevent excessive use of swap files at the expense of performance but may reduce sudden spikes leading to OOM conditions[^2]. #### Increasing Available Physical Memory Adding extra RAM directly addresses root causes behind insufficient resources available during peak loads. For servers handling large datasets or multiple concurrent tasks simultaneously, investing in additional hardware capacity provides immediate relief without altering software configurations significantly. However, before purchasing new components, consider evaluating current usage patterns through monitoring tools like `top`, `htop`, or specialized utilities such as New Relic APM services. These insights help identify potential bottlenecks within application logic itself requiring optimization efforts instead of merely scaling upwards physically[^4]. #### Configuring Overcommit Behavior Linux supports overcommitting memory allocations beyond actual limits present on machines under certain circumstances. Changing settings related to overcommit behavior might assist in preventing premature termination of critical services due to perceived shortages prematurely triggering protective measures against exhaustion scenarios. Three policies exist for controlling overcommitment levels via `/proc/sys/vm/overcommit_memory` file content modification: - **0**: Heuristic algorithm decides based upon estimated requirements. - **1**: Always allow overcommit unless absolutely impossible given existing constraints. - **2**: Never permit oversubscription past calculated maximums derived using formulas involving total installed bytes plus reserved areas set aside specifically for emergencies. For environments prone to experiencing transient bursts causing temporary deficits followed quickly thereafter by releases freeing previously occupied slots once again becoming accessible almost immediately afterward, setting policy mode equal to option two could prove beneficial provided adequate safeguards remain intact elsewhere throughout infrastructure design choices made earlier stages development lifecycle management planning phases[^1].
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