top 命令是Linux下常用的系统性能分析工具，能够实时侠士系统中各个进程的资源占用情况，默认5秒刷新一次进程列表，类似于windows的进程管理器
Processes: 294 total, 5 running, 16 stuck, 273 sleeping, 1579 threads 09:14:30
Load Avg: 2.17, 2.39, 2.42 CPU usage: 9.1% user, 7.91% sys, 83.6% idle SharedLibs: 155M resident, 20M data, 14M linkedit. MemRegions: 66937 total, 3387M resident, 88M private, 1816M shared.
PhysMem: 9476M used (2062M wired), 6902M unused. VM: 812G vsize, 467M framework vsize, 575945(0) swapins, 588650(0) swapouts. Networks: packets: 6162181/2375M in, 5318393/669M out.
Disks: 574989/11G read, 914766/15G written.
PID COMMAND %CPU TIME #TH #WQ #PORT MEM PURG CMPRS PGRP PPID STATE BOOSTS %CPU_ME %CPU_OTHRS UID FAULTS COW MSGSENT MSGRECV SYSBSD SYSMACH CSW
99501 AppleMobileD 0.0 00:00.30 3 0 49 388K 0B 4012K 99312 99312 sleeping *0[1] 0.00000 0.00000 501 3524 187 809 371 3202 1092 3178
99499 com.apple.Me 0.0 00:00.35 2 0 83 632K 0B 11M 99499 1 sleeping 0[6] 0.00000 0.00000 501 8658 877 1788 770 22597 2784 10279
99312 iTunes 0.0 00:10.89 20 3 431 38M 4984K 31M 99312 1 sleeping *0[2799] 0.00000 0.00000 501 98513 1715 52129 20236 184483 121703 91988
98455 mdworker 0.0 00:00.03 3 0 49 1828K 0B 0B 98455 1 sleeping *0[1] 0.00000 0.00000 501 3198 184 566 251 1640 647 306
93229- Microsoft Wo 0.3 00:13.73 4 1 182 47M 0B 65M 93229 1 sleeping *0[5774] 0.00000 0.00000 501 109907 2459 67479 45958+ 181925 692334+ 122489+
93226 com.apple.Sa 0.0 00:00.03 2 0 40 440K 0B 1336K 93226 1 sleeping 0[1] 0.00000 0.00000 501 4143 159 220 91 848 415 972
91730 recentsd 0.0 00:00.28 2 0 60 9372K 0B 1776K 91730 1 sleeping 0[0] 0.00000 0.00000 501 8782 168 665 343 2905 1367 5995
90883 mdworker 0.0 00:00.04 4 1 54 2084K 0B 0B 90883 1 stuck *0[1] 0.00000 0.00000 501 4025 192 624 272 6586 718 1182
90513 Google Chrom 1.5 03:46.86 17 0 218 705M+ 12K 0B 2827 2827 sleeping *0[2] 0.00000 0.00000 501 370777+ 1539 255704+ 133437 1031777+ 3654713+ 769051+
90270 com.apple.au 0.0 00:00.03 2 1 24 284K 0B 784K 90270 1 sleeping 0[2] 0.00000 0.00000 501 2054 130 142 53 510 249 2220
89529 com.apple.Co 0.0 00:00.33 4 1 111 1676K 0B 9760K 89529 1 sleeping 0[3] 0.00000 0.00000 501 10121 200 1328 767 6799 3470 4219
89526 storeinappd 0.0 00:00.44 4 0 149 2028K 0B 3444K 89526 1 sleeping 0[2] 0.00000 0.00000 501 9552 196 2232 1089 8116 4634 5380
89522 Evernote 0.0 00:07.37 22 1 348 48M 4912K 44M 89522 1 sleeping *0[2403] 0.00000 0.00000 501 118484 1940 62129 26549 113705 141884 81087
89130- Microsoft AU 0.0 00:00.36 3 1 101 1792K 0B 2948K 89130 1 sleeping *0[1652] 0.00000 0.00000 501 3949 459 14457 5993 12005 18731 9702
88758 com.apple.au 0.0 00:00.05 2 1 34 428K 0B 1304K 88758 1 sleeping 0[2] 0.00000 0.00000 501 2377 202 220 91 4581 433 2244
88757 com.apple.au 0.0 00:00.01 2 1 21 260K 0B 840K 88757 1 sleeping 0[2] 0.00000 0.00000 501 2042 128 138 54 494 241 538
88756- QQPlatform 0.0 00:01.39 5 1 146 2572K 0B 5704K 88756 1 sleeping *0[4858] 0.00000 0.00000 501 6010 856 63054+ 28595+ 42316+ 62123+ 36834+
88755- ScreenCaptur 0.0 00:01.37 5 1 143 2612K 0B 3524K 88755 1 sleeping *0[4870] 0.00000 0.00000 501 5295 532 63219+ 28646+ 42572+ 62271+ 36437+
88570- QQ 1.2 03:53.84 13 2 643 106M 5032K 37M 88570 1 sleeping *0[5558] 0.00000 0.00000 501 223753 1572 375903+ 112119+ 4165866+ 4591710+ 3724359+
87921 mdworker 0.0 00:00.03 3 0 50 1944K 0B 0B 87921 1 sleeping *0[1] 0.00000 0.00000 501 3251 184 605 269 1711 684 362
87920 mdworker 0.0 00:00.03 3 0 49 1936K 0B 0B 87920 1 sleeping *0[1] 0.00000 0.00000 501 3232 184 594 265 1635 670 419
87919 mdworker 0.0 00:00.03 3 0 49 1888K 0B 0B 87919 1 sleeping *0[1] 0.00000 0.00000 501 3223 184 594 264 1621 670 409
87918 mdworker 0.0 00:00.02 3 0 49 1892K 0B 0B 87918 1 sleeping *0[1] 0.00000 0.00000 501 3229 184 595 265 1627 670 283
85146 mdworker 0.0 00:00.06 3 0 53 2168K 0B 0B 85146 1 sleeping *0[1] 0.00000 0.00000 501 4052 192 645 284 6581 735 2548
85145 mdworker 0.0 00:00.07 3 0 54 2164K 0B 0B 85145 1 sleeping *0[1] 0.00000 0.00000 501 4054 192 633 278 6560 727 3727
82938 find 9.1 01:50.02 1/1 0 12 3260K 0B 0B 82938 82857 running *0[1] 0.00000 0.00000 0 1138586 71 44 17 4313992+ 81 1542637+
82857 bash 0.0 00:00.01 1 0 17 788K 0B 0B 82857 82856 sleeping *0[1] 0.00000 0.00000 0 1436 628 88 39 1081 112 109
82856 sudo 0.0 00:00.01 1 0 21 904K 0B 0B 82856 4325 sleeping *0[1] 0.00000 0.00000 0 1020 160 66 23 730 151 29
75843 Sequel Pro 0.0 00:04.83 12 1 266 14M 0B 29M 75843 1 sleeping *0[5092] 0.00000 0.00000 501 89980 2100 70520 27199 95666 100387 76372
73682 Google Chrom 0.2 00:37.04 12 0 235 160M+ 0B 16M 2827 2827 sleeping *0[2] 0.00000 0.00000 501 344003+ 1535 97446+ 61923+ 671770+ 1495785+ 289795+
73077 Google Chrom 0.0 00:01.18 11 0 125 3216K 0B 35M 2827 2827 sleeping *0[2] 0.00000 0.00000 501 32891 1481 3730 1615 23971 221533 10916
71599 mdworker 0.0 00:00.40 4 0 51 8584K 0B 0B 71599 1 sleeping *0[1] 0.00000 0.00000 501 10650 178 2606 986 6792 3790 2361
71598 mdworker 0.0 00:00.25 4 0 51 8600K 0B 0B 71598 1 sleeping *0[1] 0.00000 0.00000 501 7963 178 2391 926 6094 3408 2943
71223 QQMusic 1.0 01:05.79 19 1 328 117M 19M 0B 71223 1 sleeping *0[403] 0.00000 0.00000 501 301511 11852 454508+ 34518 1248921+ 907519+ 1117316+
58308 Ulysses 0.0 01:48.70 12 2 360 193M 48M 65M 58308 1 sleeping *0[6521] 0.00000 0.00000 501 685127 1201 601228 176038 722142 1002806 602518
55906 redis-server 0.0 00:07.83 3 0 16 360K 0B 1092K 55906 55828 sleeping *0[1] 0.00000 0.00000 0 1191 221 278815+ 139401+ 141206+ 278848+ 157481+
55828 bash 0.0 00:00.01 1 0 17 8192B 0B 752K 55828 55827 sleeping *0[1] 0.00000 0.00000 0 1361 603 86 38 748 109 69
55827 sudo 0.0 00:00.01 2 0 29 8192B 0B 1280K 55827 55550 sleeping *0[9] 0.00000 0.00000 0 1458 173 191 78 1048 264 169
55550 bash 0.0 00:00.06 1 0 17 8192B 0B 2316K 55550 55549 sleeping *0[1] 0.00000 0.00000 501 3387 1164 135 61 4551 157 144
55549 login 0.0 00:00.02 2 0 29 8192B 0B 1392K 55549 31692 sleeping *0[9] 0.00000 0.00000 0 1497 170 195 77 4549 291 492
进程具体信息：
- PID：进程ID
- PPID：父进程ID
- PR：进程的优先级别，越小越有限被执行
- NInice：值
- VIRT：进程占用的虚拟内存
- RES：进程使用的物力内存
- SHR：进程使用的共享内存
- S：进程的状态：S表示休眠，R表示正在运行，Z表示僵尸状态，N表示进程的优先级为负数
- %CPU：进程占用CPU的使用率
- %MEM：进程使用物力内存和总内存的百分比
- TIME+：该进程启动后占用总的CUP的时间，即占用CPU使用时间的累加值
- COMMAND：进程启动的命令