top命令是Linux下常用的系统性能分析工具。它可以实时了解系统中每个进程的资源使用情况。默认情况下，进程列表每5秒刷新一次，类似于Windows进程管理器Processes:294total,5running,16stuck,273sleeping,1579threads09:14:30LoadAvg:2.17,2.39,2.42CPUusage:9.1%user,7.91%sys,83.6%idleSharedLibs：155M驻留，20M链接数据，.MemRegions：总计66937，3387M驻留，88M私有，1816M共享。PhysMem：9476M已使用（2062M有线），6902M未使用。VM:812Gvsize,467Mframeworkvsize,575945(0)workNetswap0s,outs(088)数据包：6162181/2375Min,5318393/669Mout.Disks:574989/11Gread,914766/15Gwritten.PIDCOMMAND%CPUTIME#TH#WQ#PORTMEMPURGCMPRSPGRPPPIDSTATEBOOSTS%CPU_ME%CPU_OTHRSCUIDGSMSGRECVSYSBSDSYSMACHCSW9??9501AppleMobileD0.000:00.303049388K0B4012K9931299312sleeping*0[1]0.000000.00000501352418780937132021092317899499com.apple.Me0.000:00.352083632K0B11M994991sleeping0[6]0.000000.00000501865887717887702259727841027999312iTunes0.000：10.8920343138M4984K31M31M993121睡觉*0[2799]0.000000.000000.000005019851317131715521292023620236184448312170391988845MDWORBE]0.000000.000005013198184566251164064730693229-MicrosoftWo0.300:13.734118247M0B65M932291sleeping*0[5774]0.000000.0000050110990724596747945958+181925692334+122489+93226com.apple.萨0.000:00.032040440K0B1336K932261sleeping0[1]0.000000.0000050141431592209184841597291730recentsd0.000:00.2820609372K0B1776K917301sleeping0[0]0.000000.00000501878216866534329051367599590883mdworker0.000:00.0441542084K0B0B908831stuck*0[1]0.000000.0000050140251926242726586718118290513GoogleChrom1.503:46.86170218705M+12K0B28272827sleeping*0[2]0.000000.00000501370777+1539255704+1334371031777+3654713+769051+90270com.apple.au0.000:00.032124284K0B784K902701sleeping0[2]0.000000.00000501205413014253510249222089529com.apple.Co0.000:00.33411111676K0B9760K895291sleeping0[3]0.000000.0000050110121200132876767993470421989526storeinappd0.000:00.44401492028K0B3444K895261sleeping0[2]0.000000.0000050195521962232108981164634538089522EVERNOTE0.000：07.3722134848M44M44M44M89522睡眠*0[24030B2948K891301sleeping*0[1652]0.000000.0000050139494591445759931200518731970288758com.apple.au0.000:00.052134428K0B1304K887581sleeping0[2]0.000000.0000050123772022209145814个332244488757Com.Apple.au0.000：00.01212121260K0B840K887571睡觉0[2]0.000000.000000.000000.0000050120421281381385449449449424124153888756-QQPLATFORM0.00[4858]0.000000.00000501601085663054+28595+42316+62123+36834+88755-屏幕截图0.00000：01.37511432612K0B0B3524K8887551睡觉+62271+36437+88570-QQ1.203:53.84132643106M5032K37M885701sleeping*0[5558]0.000000.000005012237531572375903+112119+4165866+4591710+3724359+87921mdworker0.000:00.0330501944K0B0B879211睡眠*0[1]0.000000.000005013251184605269171168436287920mdworker0.000:00.0330491936K0B0B879201sleeping*0[1]0.000000.000005013232184594265163567041987919mdworker0.000:00.0330491888K0B0B879191sleeping*0[1]0.000000.000005013223184594264162167040987918mdworker0.000:00.0230491892K0B0B879181sleeping*0[1]0.000000.000005013229184595265162767028385146mdworker0.000:00.0630532168K0B0B851461睡觉*0[1]0.000000.0000050140521926452846581735254885145MDWORKER0.000：00.0730542164K0B0B0B0B0B8514511926332786560727372782938查找9.101：50.021/10123260K0B0B0B0B0B8293882857运行*0[1]0.000000.000000.000000.000000.00000000.0000001138586714417441744174313992+811542154281154237+82857+81154237+888557.BANT0B8285782856入睡*0[1]0.000000.00000014366288839108111210982856sudo0.000：00.011021904K0B0B0B0B0B0B828564325睡觉0.000：04.8312126614m0b29m758431睡觉*0[5092]0.000000.000000.0000050189980210021007052027199956661003877637273682Google0.2.00000501344003+153597446+61923+671770+1495785+289795+73077GoogleChrom0.000:01.181101253216K0B35M28272827sleeping*0[2]0.000000.0000050132891148137301615239712215331091671599mdworker0.000:00.4040518584K0B0B715991sleeping*0[1]0.000000.0000050110650178260698667923790236171598mdworker0.000:00.2540518600K0B0B715981sleeping*0[1]0.000000.000005017963178239192660943408294371223QQMusic1.001:05.79191328117M19M0B712231sleeping*0[403]0.000000.0000050130151111852454508+345181248921+907519+1117316+58308Ulysses0.001:48.70122193M48M65M583081睡眠*0[6521]0.000000.000005016851271201601228176038722142100280660251855906redis服务器0.000:07.833016K0B1092K5590655828sleeping*0[1]0.000000.0000001191221278815+139401+141206+278848+157481+55828bash0.000:00.0110178192B0B752K5582855827sleeping*0[1]0.000000.000000136160386387481096955827sudo0.000：00.0120298192B0B1280K55827555550睡觉*0[9]0.000000.0000000.00000014581458145817317319178104810481048104810481048104810416955550BASH0.016955550BASH0.000555555555555555555555555555551092BBER0[1]0.000000.000005013387116413561455115715714455549登录0.000：00.0220298192B0B1392K5554931692睡觉*0[99]99]0.000000.000000.000000.000000497777745492492492492492492492492492492492492流程。IDPPID：父进程IDPR：进程的优先级，越小越受限ExecutionNInice：值VIRT：进程占用的虚拟内存RES：进程使用的物质内存SHR：进程使用的共享内存S：进程的状态：S表示休眠，R表示运行，Z表示僵尸state，N表示进程的优先级为负数%CPU：进程占用的CPU使用率%MEM：进程占用的物理内存占总内存的百分比TIME+：进程占用的CPU总时间启动后，即CPU使用时间的累计值COMMAND：进程启动的命令
