有哪些做买家秀的网站,快速做网站公司报价,微信公众号运营方法,哪里有零基础网站建设教学公司8种机械键盘轴体对比本人程序员#xff0c;要买一个写代码的键盘#xff0c;请问红轴和茶轴怎么选#xff1f;某个机器看到一条日志:Out of Memory: Kill process xxx (xxx) score 707 or sacrifice child并且syslog, ssh等进程都被kill掉了.简单了解了下OOM(Out of Memory)…8种机械键盘轴体对比本人程序员要买一个写代码的键盘请问红轴和茶轴怎么选某个机器看到一条日志:Out of Memory: Kill process xxx (xxx) score 707 or sacrifice child并且syslog, ssh等进程都被kill掉了.简单了解了下OOM(Out of Memory)相关的问题在Linux下如果系统不足以分配程序申请的内存, OOM Killer就会被调用, 它会选择某个进程然后杀掉.man 5 proc可以看到:在Linux 2.6.11后, /proc/[pid]/oom_adj 可以控制oom的优先级等, 从-16到15, 数值越小, 被kill的可能性越低. 特殊值-17表示对当前进程禁用oom killer.在Linux 2.6.36后, /proc/[pid]/oom_adj 被弃用了, 改为 /proc/[pid]/oom_score_adj, 值从-1000到1000, 越小被kill概率越小, -1000表示不被kill.一般的进程 /proc/[pid]/oom_score_adj 值是0, 像ssh是-1000关于vm.overcommit_memory, man 5 proc也可以看到:/proc/sys/vm/overcommit_memoryThis file contains the kernel virtual memory accounting mode. Values are:0: heuristic overcommit (this is the default)1: always overcommit, never check2: always check, never overcommitIn mode 0, calls of mmap(2) with MAP_NORESERVE are not checked, and the default check is very weak, leading to the risk of getting a process OOM-killed. Under Linux 2.4, any nonzero value implies mode 1.In mode 2 (available since Linux 2.6), the total virtual address space that can be allocated (CommitLimit in /proc/meminfo) is calculated asCommitLimit (total_RAM - total_huge_TLB) *overcommit_ratio / 100 total_swapwhere:* total_RAM is the total amount of RAM on the system;* total_huge_TLB is the amount of memory set aside for huge pages;* overcommit_ratio is the value in /proc/sys/vm/overcommit_ratio; and* total_swap is the amount of swap space.默认是0; 如果设置为2, 则不会出现nevercommit. 这个overcommit, 涉及到一个如上计算公式.写了一个小程序用来耗尽内存:$ more memtest.c#include #include int main() {int *p;while(1) {int inc10*sizeof(char);p(int*) calloc(1,inc);*p 123456;if(!p) break;}}默认情况下一会程序就被killed掉了, 如果设置另外一个进程的oom_score_adj为1000, 则这个进程先被杀掉.这篇文章的9.6节讲得挺好的, 还有这个回答当然, 还有问题为何ssh等也都被杀掉了? 很奇葩
