LINUX系统基本的内存管理知识讲解.doc

LinuxLinux, RAM(1)Free:#freetotal used free shared buffers cachedMem: 256024 192284 63740 0 10676 101004-/+ buffers/cache: 80604 175420Swap: 522072 0 522072256RAM512(Mem:)total(1MB)used() freeSharedBuffers(Swap:)0free(1024)—h—m—s#free –b –s22(2)watchc free:#watch -n 2 -d freeEvery 2.0s: free Fri Jul 6 06:06:12 2007total used free shared buffers cachedMem: 233356 218616 14740 0 5560 64784-/+ buffers/cache: 148272 85084Swap: 622584 6656 615928watch free watch -n; -dWatch Ctrl-C (1)LinuxLinux;()() TLB();(2)21GLinuxCache,.swap0,vmstatvmstatVirtual Meomory Statistics()CPUvmstat 5 5(55):#vmstat 5 5procs -memory- -swap- -io- -system- -cpu-r b swpd free buff cache si so bi bo in cs us sy id wa1 0 62792 3460 9116 88092 6 30 189 89 1061 569 17 28 54 20 0 62792 3400 9124 88092 0 0 0 14 884 434 4 14 81 00 0 62792 3400 9132 88092 0 0 0 14 877 424 4 15 81 01 0 62792 3400 9140 88092 0 0 0 14 868 418 6 20 74 01 0 62792 3400 9148 88092 0 0 0 15 847 400 9 25 67 0vmstat(1)procsr bio (2)memoyswpd(KB)free(KB)buff: (KB)cache(KB)(3) swapsi: KB/so: KB/(4) io:bi: /bo: /(5)systemin: cs: ()(6)cpucs sy id r 4 id40 bibo 0Linux 1()mallocreallocnewfreedelete23 Linux unix CC+ C+ top killLinuxPsKillPs(PID)KillLinux(PID)ps v:rootwww # ps vPID TTY STAT TIME MAJFL TRS DRS RSS %MEM COMMAND2542 tty1 Ss+ 0:00 0 8 1627 428 0.1 /sbin/mingetty tty12543 tty2 Ss+ 0:00 0 8 1631 428 0.1 /sbin/mingetty tty22547 tty3 Ss+ 0:00 0 8 1631 432 0.1 /sbin/mingetty tty32548 tty4 Ss+ 0:00 0 8 1627 428 0.1 /sbin/mingetty tty42574 tty5 Ss+ 0:00 0 8 1631 432 0.1 /sbin/mingetty tty52587 tty6 Ss+ 0:00 0 8 1627 424 0.1 /sbin/mingetty tty62657 tty7 Ss+ 1:18 12 1710 29981 7040 3.0 /usr/bin/Xorg :0 -br -a2670 pts/2 Ss 0:01 2 682 6213 1496 0.6 -bash3008 pts/4 Ss 0:00 2 682 6221 1472 0.6 /bin/bash3029 pts/4 S+ 0:00 2 32 1783 548 0.2 ping 23030 pts/2 R