{"id":722,"date":"2015-11-26T07:58:10","date_gmt":"2015-11-26T07:58:10","guid":{"rendered":"http:\/\/haisins.epac.to\/wordpress\/?p=722"},"modified":"2015-11-26T07:58:10","modified_gmt":"2015-11-26T07:58:10","slug":"%ed%8a%9c%eb%8b%9d-%ea%b4%80%eb%a0%a8-%ec%9a%a9%ec%96%b4-%ec%a0%95%eb%a6%ac-2%ed%83%84","status":"publish","type":"post","link":"http:\/\/haisins.synology.me\/wordpress\/?p=722","title":{"rendered":"\ud29c\ub2dd \uad00\ub828 \uc6a9\uc5b4 \uc815\ub9ac 2\ud0c4"},"content":{"rendered":"

\u25a0 \ubb38\ub9e5 \uad50\ud658(Context switch)<\/p>\n

\ud558\ub098\uc758 \uc4f0\ub808\ub4dc\uac00 \uc2e4\ud589\ub418\ub2e4\uac00 \uc4f0\ub808\ub4dc\uc5d0\uac8c \uc8fc\uc5b4\uc9c4 \uc2dc\uac04\uc744 \ub2e4 \uc0ac\uc6a9\ud558\uac70\ub098, \uc790\ubc1c\uc801\uc778 \uc7a0\ub4ec(sleep),\uc790\uc6d0\uc774 \uc900\ube44\ub418\uae30\ub97c \uae30\ub2e4\ub9bc, \ub610\ub294 \uc6b0\uc120\uc21c\uc704\uac00 \ub192\uc740 <\/p>\n

\uc4f0\ub808\ub4dc\uac00 CPU\ub97c \uc0ac\uc6a9\ud558\uae30 \uc704\ud574 \ub300\uae30\ud558\uace0 \uc788\uc73c\uba74 \ub2e4\ub978 \uc4f0\ub808\ub4dc\ub85c \uc804\ud658\uc774 \ubc1c\uc0dd\ud558\ub294\ub370 \uc774\ub97c \ucee8\ud14d\uc2a4\ud2b8 \uc2a4\uc704\uce6d(Context Switching-\ubb38\ub9e5\uad50\ud658)\uc774\ub77c \ud55c\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc0d8\ud50c\ub9c1(sampling) & \uce74\uc6b4\ud2b8(Counts)<\/p>\n

\uc0d8\ud50c\ub9c1(Sampling)\uc740 \uc5ec\ub7ec \ub300\uc758 \uc11c\ubc84\uac00 \uc788\uc744 \uacbd\uc6b0 \ud2b9\uc815 \uc11c\ubc84\ub97c \ub300\uc0c1\uc73c\ub85c \uc131\ub2a5 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uba70 \uc9e7\uc740 \uc21c\uac04\uc758 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uc5ec \ubd84\uc11d\ud55c\ub2e4<\/p>\n

\uce74\uc6b4\ud2b8(Counts)\ub294 \ubaa8\ub4e0 \uc11c\ubc84\ub97c \ub300\uc0c1\uc73c\ub85c \uc131\ub2a5 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uba70 \uc5ec\ub7ec \ubc88\uc758 \uacfc\uc815\uc744 \uac70\uccd0 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uc5ec \ubd84\uc11d\ud55c\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc2dc\uc2a4\ud15c \uc694\uccad(System call)<\/p>\n

\uc6b4\uc601\uccb4\uc81c\uac00 \uc81c\uacf5\ud558\ub294 \uac01\uc885 \uc11c\ube44\uc2a4\ub97c \uc774\uc6a9\uc790\uac00 \uc774\uc6a9\ud560 \uc218 \uc788\ub3c4\ub85d \uac1c\ubc29\ud55c \uac83. \uc774\uc6a9\uc790\ub294 \uc774\uac83\uc744 \ud638\ucd9c\ud568\uc73c\ub85c\uc368 \ubcf5\uc7a1\ud55c \ud504\ub85c\uadf8\ub7a8\uc744 \uc791\uc131\ud560<\/p>\n

\ud544\uc694\uac00 \uc5c6\uac8c \ub41c\ub2e4. \ub610 \uc5ec\ub7ec \uac1c\uc758 \ud504\ub85c\uadf8\ub7a8\uac04\uc5d0\uc11c \ub3d9\uc77c\ud55c \uba85\uc138\ub97c \uac00\uc9c8 \uc218 \uc788\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \ud398\uc774\uc9d5(paging)<\/p>\n

\ud55c\uc815\ub41c \uae30\uc5b5 \uc6a9\ub7c9\uc73c\ub85c \ub420 \uc218 \uc788\ub294 \ub300\ub85c \ub2e4\uc218\uc758 \ud504\ub85c\uadf8\ub7a8\uc744 \ub123\uace0, \ub3d9\uc2dc\uc5d0 \ucc98\ub9ac\ud560 \uc218 \uc788\ub3c4\ub85d \ud558\uae30 \uc704\ud574 \ud504\ub85c\uadf8\ub7a8\uc744 \ud55c \ubc88\uc5d0 \ucc98\ub9ac\ud558\ub294<\/p>\n

\uc801\ub2f9\ud55c \ud06c\uae30(\ud398\uc774\uc9c0)\ub85c \ubd84\ud560\ud558\uc5ec \ud398\uc774\uc9c0 \ub2e8\uc704\ub85c \ucc98\ub9ac\ud558\ub294 \uac83\uc774\ub2e4. \ud504\ub85c\uadf8\ub7a8\uc744 \uc2e4\ud589\ud560 \ub54c\ub294 \ud398\uc774\uc9c0 \ub2e8\uc704\ub85c \uc8fc\uae30\uc5b5 \uc7a5\uce58\uc0c1\uc5d0 \ub85c\ub4dc\ud558\uace0,<\/p>\n

\uadf8\uac83 \uc774\uc678\uc5d0\ub294 \ud398\uc774\uc9c0\ub97c \ub2e8\uc704\ub85c \ud558\uc5ec \uc678\ubd80 \uae30\uc5b5 \uc7a5\uce58\uc5d0 \uc5b8\ub85c\ub4dc\ud55c\ub2e4. \ud398\uc774\uc9c0 \ub2e8\uc704\uc758 \uc2a4\uc640\ud551(swapping)\uc774\ub2e4. \ub610 \uc678\ubd80 \ud398\uc774\uc9c0 \uae30\uc5b5<\/p>\n

\uc7a5\uce58\uc640 \uc2e4\uae30\uc5b5 \uc7a5\uce58 \uc0ac\uc774\uc5d0\uc11c\uc758 \ud398\uc774\uc9c0 \uc778\/\ud398\uc774\uc9c0 \uc544\uc6c3\uc758 \uc870\uc791\uc744 \ud558\ub294 \uc77c, \uba54\ubaa8\ub9ac\uc758 \ub2e8\ud3b8\ud654(fragmentation)\ub97c \ud53c\ud558\ub294 \ub370 \uc720\ud6a8\ud558\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc2a4\uc651 \uc7a5\uce58(swap device) & \uac00\uc0c1 \uba54\ubaa8\ub9ac(VM: Virtual Memory)<\/p>\n

\uc2a4\uc651 \uc7a5\uce58\ub294 \uc6b4\uc601\uccb4\uc81c \uc124\uce58 \uc2dc\uc5d0 \ub514\uc2a4\ud06c \uc77c\uc815 \uc601\uc5ed\uc744 \uac00\uc0c1 \uba54\ubaa8\ub9ac \uc601\uc5ed\uc73c\ub85c \uc124\uc815\ud55c \ub514\ubc14\uc774\uc2a4\uc774\ub2e4. \uac00\uc0c1 \uba54\ubaa8\ub9ac\ub294 \ud504\ub85c\uc138\uc2a4\uac00 \uc2e4\ud589\ub420 \ub54c<\/p>\n

\uba54\ubaa8\ub9ac \uc5b4\ub4dc\ub808\uc2f1, fork(), exec()\ub97c \ud558\uae30 \uc704\ud55c \ubaa8\ub4e0 \uba54\ubaa8\ub9ac \uc8fc\uc18c\ub97c \uc704\ud55c \uac83\uc73c\ub85c \uae30\ubcf8 \ud06c\uae30\ub294 (\ubb3c\ub9ac \uba54\ubaa8\ub9ac \ud06c\uae30 + \uc2a4\uc651 \uc7a5\uce58\uc758 \ud06c\uae30) * \uc57d 90%\uc815\ub3c4\uac00 \ub41c\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc2e4\ud589 \ud050(Run queue)
CPU\uc5d0\uc11c \uc2e4\ud589\ub418\uae30 \uc704\ud574\uc11c\ub294 \uc2e4\ud589 \ud050\ub97c \uac70\uccd0 \ucee4\ub110 \uc4f0\ub808\ub4dc\uc5d0 \uc5f0\uacb0\ub418\uc5b4\uc57c \ud55c\ub2e4. \uc2e4\ud589 \ud050\uc5d0 \ub9ce\uc740 \uc22b\uc790\uac00 \ub098\ud0c0\ub098\uba74 \ud604\uc7ac CPU\uc5d0\uc11c \ucc98\ub9ac\ud560 \ub0b4\uc6a9\uc774 \ub9ce\uc544<\/p>\n

\ub300\uae30\ud558\uace0 \uc788\uc74c\uc744 \uc758\ubbf8\ud55c\ub2e4. \uadf8\ub798\uc11c, \uc2e4\ud589 \ud050\ub294 CPU \uc131\ub2a5 \uce21\uc815\uc744 \ud3c9\uac00\ud558\ub294 \uc911\uc694\ud55c \uc694\uc18c\uc774\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc11c\ube44\uc2a4 \uc2dc\uac04(Service time)
\uc2e4\uc9c8\uc801\uc73c\ub85c \uc694\uad6c\ud55c \uc791\uc5c5\uc774 \ucc98\ub9ac(processing) \ud558\ub294 \uc2dc\uac04\uc744 \ub9d0\ud558\uba70 \uc2e4\uc81c \uc791\uc5c5\uc2dc\uac04 (\ub300\uae30\uc2dc\uac04 \ubbf8\ud3ec\ud568), \uc11c\ube44\uc2a4\uc5d0 \uc81c\uacf5\ub41c \uc2dc\uac04\uc744 \uc758\ubbf8\ud55c\ub2e4. \uc5bc\ub9c8\ub098 \uc624\ub7ab\ub3d9\uc548<\/p>\n

\uc791\uc5c5\uc744 \uc218\ud589 \ud588\ub294\uac00\uc5d0 \ub300\ud55c \uc2dc\uac04\uc774\uba70, \ub9cc\uc57d \ud050\uc789(queueing)\ud558\ub294 \uac83\uc774 \uc5c6\ub2e4\uba74 \uc751\ub2f5 \uc2dc\uac04(response time)\uacfc \uac19\ub2e4. \ub54c\ub85c\ub294 \uc0ac\uc6a9 \uac00\ub2a5 \uc2dc\uac04\uacfc \uac19\uc740<\/p>\n

\uc758\ubbf8\ub85c \uc0ac\uc6a9\ub418\uae30\ub3c4 \ud55c\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \ub77c\uc6b0\ud305 \ud14c\uc774\ube14(Routing table)
\ub77c\uc6b0\ud130\ub294 \ub124\ud2b8\uc6cc\ud06c \uac04 \ud504\ub85c\ud1a0\ucf5c\uc5d0 \uc758\ud574 \ubaa9\uc801\ud558\ub294 \ub124\ud2b8\uc6cc\ud06c\uc5d0 \ub3c4\ub2ec\ud558\uae30 \uc704\ud55c \ub2e4\uc74c\uc758 \uac8c\uc774\ud2b8\uc6e8\uc774\uc5d0 \ub300\ud55c \uc815\ubcf4\ub97c \ubaa8\uc544\ub454 \ud45c\ub97c \uac00\uc9c0\ub294\ub370 \uc774\ub97c \ub77c\uc6b0\ud305 \ud14c\uc774\ube14\uc774\ub77c \ud55c\ub2e4.<\/p>\n

\uac01 \ub77c\uc6b0\ud130\ub4e4\uc740 \uac8c\uc774\ud2b8\uc6e8\uc774\uc5d0 \ub300\ud55c \uacbd\ub85c\ud45c\ub97c \uac00\uc9c0\uace0 \uc788\uc5b4\uc57c \ud55c\ub2e4.<\/p>\n

<\/p>\n

\u25a0 \uc18c\ucf13 \uc0c1\ud0dc(Socket status)
\ub124\ud2b8\uc6cc\ud06c \uc11c\ube44\uc2a4\uc5d0 \ub530\ub978 \uc811\uc18d \uc0c1\ud0dc\ub97c \uc758\ubbf8\ud55c\ub2e4. \ub300\ud45c\uc801\uc778 \uc18c\ucf13 \uc0c1\ud0dc\ub294 \ub2e4\uc74c\uacfc \uac19\ub2e4.<\/p>\n

<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\n

 \uc0c1\ud0dc \uac12<\/p>\n<\/td>\n

\n

 \ub0b4\uc6a9<\/p>\n<\/td>\n<\/tr>\n

\n

 BOUND<\/p>\n<\/td>\n

\n

 \uacbd\uacc4 \ub610\ub294 \ubd84\uae30\uc810\uc73c\ub85c \uc5f0\uacb0(connect)\/\ub9ac\uc2a8(listen) \ud560 \uc900\ube44\ub418\uc5b4 \uc788\uc74c\uc744 \uc758\ubbf8<\/p>\n<\/td>\n<\/tr>\n

\n

 CLOSED<\/p>\n<\/td>\n

\n

 \ub2eb\ud600\uc9d0(Closed) – \uc644\uc804\ud788 \ub2eb\ud600\uc9c4 \uc0c1\ud0dc\ub85c\uc11c \uc18c\ucf13\uc744 \uc0ac\uc6a9\ud560 \uc218 \uc5c6\ub2e4.<\/p>\n<\/td>\n<\/tr>\n

\n

 CLOSING<\/p>\n<\/td>\n

\n

 \ub9ac\ubaa8\ud2b8 \uc167\ub2e4\uc6b4(shutdown)\uc744 \uc778\uc9c0\ud558\uc5ec \ub2eb\ud600\uc9c4 \uc0c1\ud0dc \u2013 \ubcf4\ud1b5 \uba54\uc2dc\uc9c0\uac00 \uc804\uc1a1 \ub3c4\uc911 \ubd84\uc2e4\ub41c \uc0c1\ud0dc\ub97c \ub098\ud0c0\ub0b4\uae30\ub3c4 \ud55c\ub2e4<\/p>\n<\/td>\n<\/tr>\n

\n

 CLOSE_WAIT<\/p>\n<\/td>\n

\n

 \ub9ac\ubaa8\ud2b8\uac00 \uc167\ub2e4\uc6b4 \ub418\uc5c8\uc9c0\ub9cc \uc18c\ucf13\uc774 \ub2eb\ud600\uc9c0\uae30 \uc704\ud574 \uae30\ub2e4\ub9b0\ub2e4.<\/p>\n<\/td>\n<\/tr>\n

\n

 ESTABLISHED<\/p>\n<\/td>\n

\n

 \uc5f0\uacb0\uc774 \ud655\uc815\ub41c \uc0c1\ud0dc<\/p>\n<\/td>\n<\/tr>\n

\n

 FIN_WAIT_1<\/p>\n<\/td>\n

\n

 \uc18c\ucf13\uc774 \ub2eb\ud600\uc84c\uc9c0\ub9cc \uc5f0\uacb0\uc774 \uc167-\ub2e4\uc6b4 \uc911\uc778 \uc0c1\ud0dc<\/p>\n<\/td>\n<\/tr>\n

\n

 FIN_WAIT_2<\/p>\n<\/td>\n

\n

 \uc18c\ucf13\uc774 \ub2eb\ud600\uc84c\uc9c0\ub9cc, \ub9ac\ubaa8\ud2b8\ub85c\ubd80\ud130 \uc167\ub2e4\uc6b4\uc744 \uc704\ud558\uc5ec \uae30\ub2e4\ub9bc<\/p>\n<\/td>\n<\/tr>\n

\n

 IDLE<\/p>\n<\/td>\n

\n

 \uc11c\ube44\uc2a4 \uac00\ub2a5\ud558\ub3c4\ub85d \uc5f4\ub824(open) \uc788\uc9c0\ub9cc BOUND \uc0c1\ud0dc\ub294 \uc544\ub2c8\ub2e4.<\/p>\n<\/td>\n<\/tr>\n

\n

 LAST_ACK<\/p>\n<\/td>\n

\n

 \ub2eb\ud600\uc9c0\ub294 \uac83\uc744 \uc778\uc9c0\ud560 \ub54c \ub9ac\ubaa8\ud2b8\uac00 \uc167\ub2e4\uc6b4<\/p>\n<\/td>\n<\/tr>\n

\n

 LISTEN<\/p>\n<\/td>\n

\n

 \uc5f0\uacb0 \uc694\uccad\uc744 \uc624\ub294 \uac83\uc5d0 \ub300\ud558\uc5ec \ub9ac\uc2a8(listen)<\/p>\n<\/td>\n<\/tr>\n

\n

 SYN_RECEIVED<\/p>\n<\/td>\n

\n

 \uc5f0\uacb0\uc744 \uc704\ud574 \ub3d9\uae30\ud654 \ud558\ub294 \uac83\uc744 \ucd08\uae30\ud654<\/p>\n<\/td>\n<\/tr>\n

\n

 SYN_SENT<\/p>\n<\/td>\n

\n

 \uc5f0\uacb0\uc744 \ud655\ub9bd\ud558\uae30 \uc704\ud558\uc5ec \uc2dc\ub3c4\ud558\ub294 \uc0c1\ud0dc<\/p>\n<\/td>\n<\/tr>\n

\n

 TIME_WAIT<\/p>\n<\/td>\n

\n

 \ub9ac\ubaa8\ud2b8 \uc167\ub2e4\uc6b4 \uc7ac\uc804\uc1a1\uc5d0 \ub300\ud558\uc5ec \ub2eb\ud600\uc9c4 \ud6c4\uc5d0 \uae30\ub2e4\ub9bc \uc989, \uc5f0\uacb0\uc740 \uc885\ub8cc \ub418\uc5c8\uc9c0\ub9cc \ubd84\uc2e4\ub418\uc5c8\uc744\uc9c0 \ubaa8\ub97c \ub290\ub9b0 \uc138\uadf8\uba58\ud2b8\ub97c \uc704\ud574 \ub2f9\ubd84\uac04 \uc18c\ucf13\uc744 \uc5f4\uc5b4\ub193\uc740 \uc0c1\ud0dc\ub97c \uc758\ubbf8\ud55c\ub2e4.<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

<\/p>\n","protected":false},"excerpt":{"rendered":"

\u25a0 \ubb38\ub9e5 \uad50\ud658(Context switch) \ud558\ub098\uc758 \uc4f0\ub808\ub4dc\uac00 \uc2e4\ud589\ub418\ub2e4\uac00 \uc4f0\ub808\ub4dc\uc5d0\uac8c \uc8fc\uc5b4\uc9c4 \uc2dc\uac04\uc744 \ub2e4 \uc0ac\uc6a9\ud558\uac70\ub098, \uc790\ubc1c\uc801\uc778 \uc7a0\ub4ec(sleep),\uc790\uc6d0\uc774 \uc900\ube44\ub418\uae30\ub97c \uae30\ub2e4\ub9bc, \ub610\ub294 \uc6b0\uc120\uc21c\uc704\uac00 \ub192\uc740 \uc4f0\ub808\ub4dc\uac00 CPU\ub97c \uc0ac\uc6a9\ud558\uae30 \uc704\ud574 \ub300\uae30\ud558\uace0 \uc788\uc73c\uba74 \ub2e4\ub978 \uc4f0\ub808\ub4dc\ub85c \uc804\ud658\uc774 \ubc1c\uc0dd\ud558\ub294\ub370 \uc774\ub97c \ucee8\ud14d\uc2a4\ud2b8 \uc2a4\uc704\uce6d(Context Switching-\ubb38\ub9e5\uad50\ud658)\uc774\ub77c \ud55c\ub2e4. \u25a0 \uc0d8\ud50c\ub9c1(sampling) & \uce74\uc6b4\ud2b8(Counts) \uc0d8\ud50c\ub9c1(Sampling)\uc740 \uc5ec\ub7ec \ub300\uc758 \uc11c\ubc84\uac00 \uc788\uc744 \uacbd\uc6b0 \ud2b9\uc815 \uc11c\ubc84\ub97c \ub300\uc0c1\uc73c\ub85c \uc131\ub2a5 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uba70 \uc9e7\uc740 \uc21c\uac04\uc758 \ub370\uc774\ud130\ub97c \uc218\uc9d1\ud558\uc5ec \ubd84\uc11d\ud55c\ub2e4 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_bbp_topic_count":0,"_bbp_reply_count":0,"_bbp_total_topic_count":0,"_bbp_total_reply_count":0,"_bbp_voice_count":0,"_bbp_anonymous_reply_count":0,"_bbp_topic_count_hidden":0,"_bbp_reply_count_hidden":0,"_bbp_forum_subforum_count":0,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"spay_email":""},"categories":[405],"tags":[412,413,414,415,416],"jetpack_featured_media_url":"","amp_enabled":true,"_links":{"self":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/722"}],"collection":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=722"}],"version-history":[{"count":0,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/722\/revisions"}],"wp:attachment":[{"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=722"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=722"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/haisins.synology.me\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=722"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}