.
This commit is contained in:
ridethepig
parent
8e66657fe8
commit
abe668700c
@ -434,5 +434,475 @@
|
||||
:height 1296}),
|
||||
:page 56},
|
||||
:content {:text " KEY PROCESS TERMS"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cc7d2-cd33-4dd6-879f-72f1070ed96d",
|
||||
:page 60,
|
||||
:position {:bounding {:x1 404.16966247558594,
|
||||
:y1 343.8303680419922,
|
||||
:x2 691.9583587646484,
|
||||
:y2 381.54466247558594,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 404.16966247558594,
|
||||
:y1 343.8303680419922,
|
||||
:x2 691.9583587646484,
|
||||
:y2 381.54466247558594,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 60},
|
||||
:content {:text "Interlude: Process API"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cc975-cf26-431c-8c38-617da01d89ee",
|
||||
:page 65,
|
||||
:position {:bounding {:x1 0,
|
||||
:y1 46.28571605682373,
|
||||
:x2 746.3800811767578,
|
||||
:y2 272.88393688201904,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 0,
|
||||
:y1 46.28571605682373,
|
||||
:x2 0,
|
||||
:y2 65.71428966522217,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 301.4553680419922,
|
||||
:y1 233.58928966522217,
|
||||
:x2 393.60862731933594,
|
||||
:y2 257.01787853240967,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 393.5982208251953,
|
||||
:y1 235.25001049041748,
|
||||
:x2 746.3800811767578,
|
||||
:y2 253.17858409881592,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 255.1696424484253,
|
||||
:x2 367.95936584472656,
|
||||
:y2 272.88393688201904,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 65},
|
||||
:content {:text "Get it right. Neither abstraction nor simplicity is a substitute for getting it righ"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642ccc92-baa5-4b54-8525-9a664698c669",
|
||||
:page 65,
|
||||
:position {:bounding {:x1 0,
|
||||
:y1 334.2857208251953,
|
||||
:x2 747.6986846923828,
|
||||
:y2 766.8035888671875,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 0,
|
||||
:y1 334.2857208251953,
|
||||
:x2 0,
|
||||
:y2 353.71429443359375,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 0,
|
||||
:y1 350.2857208251953,
|
||||
:x2 0,
|
||||
:y2 369.7142868041992,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 0,
|
||||
:y1 366.2857208251953,
|
||||
:x2 0,
|
||||
:y2 385.7142868041992,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 419.60740661621094,
|
||||
:y1 689.3303680419922,
|
||||
:x2 747.6986846923828,
|
||||
:y2 707.2589416503906,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 709.2589416503906,
|
||||
:x2 747.6194000244141,
|
||||
:y2 727.1875152587891,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 729.1696624755859,
|
||||
:x2 747.0166168212891,
|
||||
:y2 747.0982360839844,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 749.0893096923828,
|
||||
:x2 532.4863128662109,
|
||||
:y2 766.8035888671875,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 65},
|
||||
:content {:text "the separation of fork() and exec() is essential in building a UNIX shell, because it lets the shell run code after the call to fork() but before the call to exec(); this code can alter the environment of the about-to-be-run program, "},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642ccf62-0b5a-41db-899e-3e99a69c2eac",
|
||||
:page 67,
|
||||
:position {:bounding {:x1 500.46167755126953,
|
||||
:y1 898.3482360839844,
|
||||
:x2 588.625373840332,
|
||||
:y2 916.0625305175781,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 500.46167755126953,
|
||||
:y1 898.3482360839844,
|
||||
:x2 588.625373840332,
|
||||
:y2 916.0625305175781,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 67},
|
||||
:content {:text "imperatives"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cd11a-eea5-48f8-b4d1-b225f37ccdb4",
|
||||
:page 67,
|
||||
:position {:bounding {:x1 315.2972640991211,
|
||||
:y1 938.2054138183594,
|
||||
:x2 363.1093215942383,
|
||||
:y2 955.919677734375,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 315.2972640991211,
|
||||
:y1 938.2054138183594,
|
||||
:x2 363.1093215942383,
|
||||
:y2 955.919677734375,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 67},
|
||||
:content {:text " signa"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cd1eb-c058-484a-ac25-782e37082bc6",
|
||||
:page 74,
|
||||
:position {:bounding {:x1 285.3382987976074,
|
||||
:y1 938.2500305175781,
|
||||
:x2 524.2904014587402,
|
||||
:y2 959.9642944335938,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 285.3382987976074,
|
||||
:y1 938.2500305175781,
|
||||
:x2 524.2904014587402,
|
||||
:y2 959.9642944335938,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 74},
|
||||
:content {:text "Limited Direct Execution"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cd2f2-c565-4309-951a-1f809da9beff",
|
||||
:page 75,
|
||||
:position {:bounding {:x1 171.8928680419922,
|
||||
:y1 775.9822082519531,
|
||||
:x2 236.6775360107422,
|
||||
:y2 793.6964416503906,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 171.8928680419922,
|
||||
:y1 775.9822082519531,
|
||||
:x2 236.6775360107422,
|
||||
:y2 793.6964416503906,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 75},
|
||||
:content {:text "aspiring"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cd3e3-3fa6-43a6-a37a-cae62c634654",
|
||||
:page 76,
|
||||
:position {:bounding {:x1 197.56250381469727,
|
||||
:y1 792.107177734375,
|
||||
:x2 282.93234634399414,
|
||||
:y2 815.5357360839844,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 197.56250381469727,
|
||||
:y1 792.107177734375,
|
||||
:x2 282.93234634399414,
|
||||
:y2 815.5357360839844,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 76},
|
||||
:content {:text "user mode"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cd6be-083b-4ecd-b220-aafef97a8b65",
|
||||
:page 78,
|
||||
:position {:bounding {:x1 309.4553680419922,
|
||||
:y1 972.6250610351562,
|
||||
:x2 586.8960418701172,
|
||||
:y2 996.0536193847656,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 309.4553680419922,
|
||||
:y1 972.6250610351562,
|
||||
:x2 586.8960418701172,
|
||||
:y2 996.0536193847656,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 78},
|
||||
:content {:text "Limited Direct Execution Protocol"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cd6e9-21fc-49c7-b0bb-0c9ba3b7a524",
|
||||
:page 79,
|
||||
:position {:bounding {:x1 313.4107360839844,
|
||||
:y1 195.0178680419922,
|
||||
:x2 363.1207580566406,
|
||||
:y2 212.9464340209961,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 313.4107360839844,
|
||||
:y1 195.0178680419922,
|
||||
:x2 363.1207580566406,
|
||||
:y2 212.9464340209961,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 79},
|
||||
:content {:text "WARY"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cd90e-ab6b-4d4d-8312-cd8c69efdac8",
|
||||
:page 80,
|
||||
:position {:bounding {:x1 240.1057357788086,
|
||||
:y1 411.30360412597656,
|
||||
:x2 519.1290512084961,
|
||||
:y2 433.0178909301758,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 240.1057357788086,
|
||||
:y1 411.30360412597656,
|
||||
:x2 519.1290512084961,
|
||||
:y2 433.0178909301758,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 80},
|
||||
:content {:text "Switching Between Processes"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cdc2e-329c-423e-a65a-0a53fb6eaa76",
|
||||
:page 81,
|
||||
:position {:bounding {:x1 336.91209411621094,
|
||||
:y1 1022.8215026855469,
|
||||
:x2 423.3618927001953,
|
||||
:y2 1040.5357818603516,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 336.91209411621094,
|
||||
:y1 1022.8215026855469,
|
||||
:x2 423.3618927001953,
|
||||
:y2 1040.5357818603516,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 81},
|
||||
:content {:text "malfeasance"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642ce319-8087-4252-b51d-42f749f7c283",
|
||||
:page 83,
|
||||
:position {:bounding {:x1 241.65673828125,
|
||||
:y1 254.54465866088867,
|
||||
:x2 288.17628479003906,
|
||||
:y2 272.25893783569336,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 241.65673828125,
|
||||
:y1 254.54465866088867,
|
||||
:x2 288.17628479003906,
|
||||
:y2 272.25893783569336,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 83},
|
||||
:content {:text "coff a"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642ce357-9914-417b-8036-35ae44ac7283",
|
||||
:page 83,
|
||||
:position {:bounding {:x1 537.6926574707031,
|
||||
:y1 462.4286003112793,
|
||||
:x2 579.2625122070312,
|
||||
:y2 480.1428642272949,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 537.6926574707031,
|
||||
:y1 462.4286003112793,
|
||||
:x2 579.2625122070312,
|
||||
:y2 480.1428642272949,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 83},
|
||||
:content {:text " enac"},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cef47-0c2f-482f-8b61-9a715e5438e5",
|
||||
:page 84,
|
||||
:position {:bounding {:x1 164.6323013305664,
|
||||
:y1 1059.1072082519531,
|
||||
:x2 205.6727066040039,
|
||||
:y2 1076.8215026855469,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 164.6323013305664,
|
||||
:y1 1059.1072082519531,
|
||||
:x2 205.6727066040039,
|
||||
:y2 1076.8215026855469,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 84},
|
||||
:content {:text "whet "},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cf0c1-59a2-410e-8f45-517f66ef47f9",
|
||||
:page 86,
|
||||
:position {:bounding {:x1 187.13980865478516,
|
||||
:y1 734.4018096923828,
|
||||
:x2 265.6998596191406,
|
||||
:y2 752.1161041259766,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 187.13980865478516,
|
||||
:y1 734.4018096923828,
|
||||
:x2 265.6998596191406,
|
||||
:y2 752.1161041259766,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 86},
|
||||
:content {:text "analogous "},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cf292-4464-4c8f-8639-3a194484d4c0",
|
||||
:page 90,
|
||||
:position {:bounding {:x1 173.84801483154297,
|
||||
:y1 1038.8928833007812,
|
||||
:x2 359.95592498779297,
|
||||
:y2 1056.607177734375,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 173.84801483154297,
|
||||
:y1 1038.8928833007812,
|
||||
:x2 359.95592498779297,
|
||||
:y2 1056.607177734375,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 90},
|
||||
:content {:text "workload assumptions w"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cf48d-b312-4af1-a2ff-d55cf9f32e48",
|
||||
:page 91,
|
||||
:position {:bounding {:x1 0,
|
||||
:y1 270.2857208251953,
|
||||
:x2 747.7616271972656,
|
||||
:y2 625.1696624755859,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 0,
|
||||
:y1 270.2857208251953,
|
||||
:x2 0,
|
||||
:y2 289.71429443359375,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 615.4732360839844,
|
||||
:y1 581.8125305175781,
|
||||
:x2 747.7616271972656,
|
||||
:y2 605.2410888671875,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 615.4472351074219,
|
||||
:y1 583.4732360839844,
|
||||
:x2 747.7616271972656,
|
||||
:y2 601.1875305175781,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 601.7410888671875,
|
||||
:x2 192.8222198486328,
|
||||
:y2 625.1696624755859,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 91},
|
||||
:content {:text "scheduling metric"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cf4c4-d246-48f2-a6ef-f14c77684ad9",
|
||||
:page 91,
|
||||
:position {:bounding {:x1 551.5064392089844,
|
||||
:y1 929.8125,
|
||||
:x2 635.8687438964844,
|
||||
:y2 947.5267944335938,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 551.5064392089844,
|
||||
:y1 929.8125,
|
||||
:x2 635.8687438964844,
|
||||
:y2 947.5267944335938,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 91},
|
||||
:content {:text "conundrum "},
|
||||
:properties {:color "green"}}
|
||||
{:id #uuid "642cf4f9-4afd-4240-ac76-5522285fa1eb",
|
||||
:page 91,
|
||||
:position {:bounding {:x1 0,
|
||||
:y1 574.2857666015625,
|
||||
:x2 747.7544326782227,
|
||||
:y2 1081.6161346435547,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 0,
|
||||
:y1 574.2857666015625,
|
||||
:x2 0,
|
||||
:y2 593.7143249511719,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 643.7589492797852,
|
||||
:y1 1038.2589950561523,
|
||||
:x2 747.7544326782227,
|
||||
:y2 1061.6875686645508,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 643.7497329711914,
|
||||
:y1 1039.9197082519531,
|
||||
:x2 747.7544326782227,
|
||||
:y2 1057.6339950561523,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 1058.1875686645508,
|
||||
:x2 258.0138168334961,
|
||||
:y2 1081.6161346435547,
|
||||
:width 864,
|
||||
:height 1296}
|
||||
{:x1 171.8928680419922,
|
||||
:y1 1061.0447082519531,
|
||||
:x2 266.54952239990234,
|
||||
:y2 1078.9732818603516,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 91},
|
||||
:content {:text "First In, First Out (FIFO)"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cf705-4a47-4daa-a542-43c4ae6f239e",
|
||||
:page 93,
|
||||
:position {:bounding {:x1 171.8928680419922,
|
||||
:y1 570.7500419616699,
|
||||
:x2 333.2419891357422,
|
||||
:y2 592.4643363952637,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 171.8928680419922,
|
||||
:y1 570.7500419616699,
|
||||
:x2 333.2419891357422,
|
||||
:y2 592.4643363952637,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 93},
|
||||
:content {:text "Shortest Job First"},
|
||||
:properties {:color "yellow"}}
|
||||
{:id #uuid "642cfce4-67f5-4315-bf81-445922b8ae54",
|
||||
:page 94,
|
||||
:position {:bounding {:x1 116.09822082519531,
|
||||
:y1 998.1607666015625,
|
||||
:x2 518.0627288818359,
|
||||
:y2 1019.8750610351562,
|
||||
:width 864,
|
||||
:height 1296},
|
||||
:rects ({:x1 116.09822082519531,
|
||||
:y1 998.1607666015625,
|
||||
:x2 518.0627288818359,
|
||||
:y2 1019.8750610351562,
|
||||
:width 864,
|
||||
:height 1296}),
|
||||
:page 94},
|
||||
:content {:text "Shortest Time-to-Completion First (STCF)"},
|
||||
:properties {:color "yellow"}}],
|
||||
:extra {:page 65}}
|
||||
:extra {:page 95}}
|
||||
|
||||
2
journals/2023_04_05.md
Normal file
2
journals/2023_04_05.md
Normal file
@ -0,0 +1,2 @@
|
||||
-
|
||||
-
|
||||
@ -95,3 +95,127 @@ file-path:: ../assets/ostep_1680491762166_0.pdf
|
||||
hl-page:: 56
|
||||
hl-color:: yellow
|
||||
id:: 642c27e3-d7d6-41d8-9832-73674615a246
|
||||
- Interlude: Process API
|
||||
hl-page:: 60
|
||||
ls-type:: annotation
|
||||
id:: 642cc7d2-cd33-4dd6-879f-72f1070ed96d
|
||||
hl-color:: yellow
|
||||
Syscall-fork, wait, exec
|
||||
- Get it right. Neither abstraction nor simplicity is a substitute for getting it right
|
||||
ls-type:: annotation
|
||||
hl-page:: 65
|
||||
hl-color:: yellow
|
||||
id:: 642cc975-cf26-431c-8c38-617da01d89ee
|
||||
- the separation of fork() and exec() is essential in shell, because it lets the shell <u>run code after the call to fork() but before the call to exec()</u>; this code can alter the environment of the about-to-be-run program
|
||||
hl-page:: 65
|
||||
ls-type:: annotation
|
||||
id:: 642ccc92-baa5-4b54-8525-9a664698c669
|
||||
hl-color:: yellow
|
||||
- imperative 必要的，命令的；必要的事
|
||||
hl-page:: 67
|
||||
ls-type:: annotation
|
||||
id:: 642ccf62-0b5a-41db-899e-3e99a69c2eac
|
||||
hl-color:: green
|
||||
- control processes through signal subsystem
|
||||
hl-page:: 67
|
||||
ls-type:: annotation
|
||||
id:: 642cd11a-eea5-48f8-b4d1-b225f37ccdb4
|
||||
hl-color:: yellow
|
||||
- Limited Direct Execution: Direct execution is to simply run the program directly on the CPU.
|
||||
hl-page:: 74
|
||||
ls-type:: annotation
|
||||
id:: 642cd1eb-c058-484a-ac25-782e37082bc6
|
||||
hl-color:: yellow
|
||||
- aspiring 有追求的，有抱负的
|
||||
hl-page:: 75
|
||||
ls-type:: annotation
|
||||
id:: 642cd2f2-c565-4309-951a-1f809da9beff
|
||||
hl-color:: green
|
||||
- user mode and kernel mode
|
||||
hl-page:: 76
|
||||
ls-type:: annotation
|
||||
id:: 642cd3e3-3fa6-43a6-a37a-cae62c634654
|
||||
hl-color:: yellow
|
||||
- In user mode, code is restricted in what it can do, otherwise the processor will raise an exception
|
||||
- User code perform system call to do privileged operation.
|
||||
- To execute a system call, use `trap` and `return-from-trap` instruction: jump to/from kernel and change the privilege level.
|
||||
-
|
||||
- Limited Direct Execution Protocol-interesting figure illustrating how system call is done
|
||||
hl-page:: 78
|
||||
ls-type:: annotation
|
||||
id:: 642cd6be-083b-4ecd-b220-aafef97a8b65
|
||||
hl-color:: yellow
|
||||
- wary 谨慎的；考虑周到的
|
||||
hl-page:: 79
|
||||
ls-type:: annotation
|
||||
id:: 642cd6e9-21fc-49c7-b0bb-0c9ba3b7a524
|
||||
hl-color:: green
|
||||
- Switching Between Processes: how OS regain control of the CPU
|
||||
hl-page:: 80
|
||||
ls-type:: annotation
|
||||
id:: 642cd90e-ab6b-4d4d-8312-cd8c69efdac8
|
||||
hl-color:: yellow
|
||||
- Cooperative Approach: wait for a system call. 1. The processes are expected to give up the CPU periodically through system call `yield`(which does nothing except to transfer control to the OS). 2. The process does something that causes a trap
|
||||
- Non-Cooperative Approach: timer interrupt.
|
||||
- Context switch: save a few register values for the currently-executing process.
|
||||
Two types of register saves/restores: TI, hardware save state to kernel stack; context switch, OS save kernel registers and restore everything to return from trap
|
||||
- malfeasance 渎职；不正当行为
|
||||
hl-page:: 81
|
||||
ls-type:: annotation
|
||||
id:: 642cdc2e-329c-423e-a65a-0a53fb6eaa76
|
||||
hl-color:: green
|
||||
- scoff
|
||||
hl-page:: 83
|
||||
ls-type:: annotation
|
||||
id:: 642ce319-8087-4252-b51d-42f749f7c283
|
||||
hl-color:: green
|
||||
- enact
|
||||
ls-type:: annotation
|
||||
hl-page:: 83
|
||||
hl-color:: green
|
||||
id:: 642ce357-9914-417b-8036-35ae44ac7283
|
||||
- whet
|
||||
ls-type:: annotation
|
||||
hl-page:: 84
|
||||
hl-color:: green
|
||||
id:: 642cef47-0c2f-482f-8b61-9a715e5438e5
|
||||
- analogous
|
||||
ls-type:: annotation
|
||||
hl-page:: 86
|
||||
hl-color:: green
|
||||
id:: 642cf0c1-59a2-410e-8f45-517f66ef47f9
|
||||
- workload assumptions: Each job, runs for the same amount of time, arrives at the same time, runs to completion, uses only CPU, and run-time is known
|
||||
hl-page:: 90
|
||||
ls-type:: annotation
|
||||
id:: 642cf292-4464-4c8f-8639-3a194484d4c0
|
||||
hl-color:: yellow
|
||||
- Quite unrealistic, but modern preemptive scheduling somewhat mimics part of these assumptions
|
||||
- scheduling metric: turnaround time, aka `completion - arrival`
|
||||
hl-page:: 91
|
||||
ls-type:: annotation
|
||||
id:: 642cf48d-b312-4af1-a2ff-d55cf9f32e48
|
||||
hl-color:: yellow
|
||||
- conundrum
|
||||
ls-type:: annotation
|
||||
hl-page:: 91
|
||||
hl-color:: green
|
||||
id:: 642cf4c4-d246-48f2-a6ef-f14c77684ad9
|
||||
- First In, First Out (FIFO/FCFS) algorithm
|
||||
hl-page:: 91
|
||||
ls-type:: annotation
|
||||
id:: 642cf4f9-4afd-4240-ac76-5522285fa1eb
|
||||
hl-color:: yellow
|
||||
- Bad average turnaround when long job runs first
|
||||
- Convoy effect: a number of relatively-short potential consumers of a resource get queued behind a heavyweight resource consumer
|
||||
- Shortest Job First(SJF)
|
||||
hl-page:: 93
|
||||
ls-type:: annotation
|
||||
id:: 642cf705-4a47-4daa-a542-43c4ae6f239e
|
||||
hl-color:: yellow
|
||||
- assuming that jobs all arriving at the same time, it could be proven that SJF is indeed an optimal scheduling algorithm
|
||||
- Downgrade to the same problem of Convey Effect when jobs don't arrive at the same time. For example, short jobs arrive shortly after the long job.
|
||||
- Shortest Time-to-Completion First (STCF)
|
||||
ls-type:: annotation
|
||||
hl-page:: 94
|
||||
hl-color:: yellow
|
||||
id:: 642cfce4-67f5-4315-bf81-445922b8ae54
|
||||
Loading…
Reference in New Issue
Block a user