三大Linux command查看CPU和Memory的使用情况 1. top command :是linux下常用的性能分析工具,能够实时显示系统中各个进程的资源占用状况。 2. free command : free -m查看内存占用情况 free -S不间断地监控有多少内存在使用 --- For example : total used free shared buffers cached Mem: 128 119 8 0 1 22...
On linux, there are commands for almost everything, because the gui might not be always available. When working on servers only shell access is available and everything has to be done from these commands. So today we shall be checking the commands that can be used to check memory usage on...
即可以传输到设备也可以从设备传出,返回物理地址 scratch_addr = dma_map_single(..., DMA_BIDIRECTIONAL); dwc->scratch_addr = scratch_addr // 保存物理地址 param = lower_32_bits(scratch_addr) // 获取低32位物理地址 dwc3_send_gadget_generic_command(..., DWC3_DGCMD_SET_SCRATCHPAD_ADDR_LO,...
$ valgrind --tool=memcheck --leak-check=full ./val ==2972== Memcheck, a memory error detector ==2972== Copyright (C) 2002-2009, and GNU GPL'd, by Julian Seward et al. ==2972== Using Valgrind-3.6.0.SVN-Debian and LibVEX; rerun with -h for copyright info ==2972== Command: ...
MEMORY: 崩溃主机的物理内存 PANIC: 崩溃类型,常见的崩溃类型包括: SysRq (System Request):通过魔法组合键导致的系统崩溃,通常是测试使用。通过 echo c > /proc/sysrq-trigger,就可以触发系统崩溃。 oops:可以看成是内核级的 Segmentation Fault。应用程序如果进行了非法内存访问或执行了非法指令,会得到 Segfault ...
分析Memory使用状况 内存是影响服务器性能的一个主要因素, 当进程已经驻留内存或者系能够分配给进程足够的内存给它, CPU能顺利自如的运行. 如果发生内存不足, 服务器使用I/O channel获取数据, 由于访问I/O channel速度大约比访问内存满1000倍, 这会给服务器带了性能问题. ...
非一致性内存访问 NUMA(Non-Uniform Memory Access)意思是内存被划分为各个node,访问一个node花费的时间取决于CPU离这个node的距离。每一个cpu内部有一个本地的node,访问本地node时间比访问其他node的速度快一致性内存访问 UMA(Uniform Memory Access)也可以称为SMP(Symmetric Multi-Process)对称多处理器。意思是所有...
CMA区域的创建有两种方法,一种是通过dts的reserved memory,另外一种是通过command line参数和内核配置参数。 dts方式: reserved-memory { /* global autoconfigured region for contiguous allocations */ linux,cma { compatible = "shared-dma-pool"; reusable; size = <0 0x28000000>; alloc-ranges = <0 0x...
Check installed memory size with dmidecode command Check linux memory usage with the atop command Get realtime linux memory info with top and htop commands Check Linux memory usage with the free command To check available free memory and swaps, use thefreecommand. Just run the command like bello...
==28469== Memcheck, a memory error detector ==28469== Copyright (C) 2002-2015, and GNU GPL'd, by Julian Seward et al. ==28469== Using Valgrind-3.11.0 and LibVEX; rerun with -h for copyright info ==28469== Command: ./test ...