Farashin Indirection a Tsatsa

Farashin Abstraction: Fahimtar Jagoranci a Tsatsa Tsatsa harshe ne da aka gina akan alƙawari mai ƙarfi: ƙarancin tsadar sifili. Yana ba masu haɓaka damar rubuta babban matakin, aminci, da lambar bayyanawa ba tare da biyan hukuncin aiki a lokacin aiki ba. Wannan falsafar ita ce tsakiyar dalilin da yasa Rust ya yi fice a cikin shirye-shiryen tsarin, daga tsarin aiki zuwa injinan wasa. Koyaya, ra'ayin "madaidaici" yana zaune a mararraba mai ban sha'awa a ƙirar Rust. Duk da yake sau da yawa yana da mahimmanci don sassauƙa da aminci, karkarwa ba koyaushe ba ce mai tsada ba, kuma rashin amfani da shi na iya yin shuru yana lalata aikin da ya shahara da Rust. Don dandamali kamar Mewayz, OS na kasuwanci na yau da kullun inda inganci da amfani da albarkatun da za a iya faɗi ke da mahimmanci, fahimtar wannan farashin ba ilimi ba ne—yana da mahimmanci don gina ƙaƙƙarfan dabaru na kasuwanci.

Mene ne Indirection kuma Me yasa Muke Bukatarsa?

Indirection wata dabara ce ta shirye-shirye inda za ku yi la'akari da wani abu ba kai tsaye ba, amma ta hanyar tsaka-tsaki. A cikin Tsatsa, mafi yawan nau'ikan su ne masu nuni, nassoshi, abubuwa masu halaye, da masifu masu wayo kamar 'Box', 'Rc', ko 'Arc'. Waɗannan kayan aikin ba makawa ne. Suna ba da damar haɓakar ɗabi'a, rabon tudu, mallakar haɗin gwiwa, da polymorphism. Misali, 'Vec>' yana ba ku damar adana tarin nau'ikan iri daban-daban waɗanda duk ke aiwatar da sifar 'Zana', tsarin gama gari a cikin tsarin UI ko kayan aikin plugin. Ba tare da karkata ba, rubuta sassauƙa, lambar ƙira zai zama da wahala ƙwarai.

" Abstraction shine fasaha na ɓoye rikitarwa, kuma indirection shine kayan aiki na farko. A cikin Rust, ƙalubalen shine a yi amfani da wannan kayan aikin ba tare da barin farashin abstraction ya zama harajin lokaci ba."

Harajin Ayyuka na Boye

Yayin da abstraction sau da yawa "sifili-cost" dangane da abin da kuke iya rubutawa da hannu, juzu'i da kanta tana gabatar da sama-sama na zahiri. Wannan farashi yana bayyana a wurare masu mahimmanci:

• Ƙarin Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwaƙwalwar Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwararren Ƙwaƙwalwa na Ƙaƙwalwar Ƙaƙwalwa ) : Bi mai nuna alama yana buƙatar tsalle zuwa wani adireshin ƙwaƙwalwar ajiya na daban. Wannan na iya kayar da prefetching na cache na CPU, yana haifar da saurin karantawa sosai idan aka kwatanta da bayanan layi, bayanan layi.
• Dinamic Dispatch: Abubuwan dabi'u ('dyn Trait`) suna amfani da tebur mai kama-da-wane (vtables) don warware hanyar kira a lokacin aiki. Wannan yana ƙara ƙaramin sama don duba mai nuna alama kuma yana hana haɗaɗɗen haɗaɗɗiyar, wanda zai iya zama babban kisa mai haɓakawa don madaukai masu zafi.
Ƙididdigar Heap: Nau'o'in kamar 'Box' suna nuna rabon tudu, wanda shine oda mai girma a hankali fiye da rabon tara kuma yana ƙara matsa lamba akan mai rabawa.
• Tsarin Ƙaddamarwa: Hanyoyi masu yawa na karkata (misali, 'Box' mai ɗauke da 'Rc' zuwa tsari tare da 'Vec' na abubuwa masu alama) suna haɓaka waɗannan farashi, yana sa hanyoyin samun bayanai a hankali da rashin tabbas.

A cikin OS na kasuwanci kamar Mewayz, inda kayayyaki ke buƙatar aiwatar da rafukan bayanai, sarrafa ayyukan aiki, da kuma ba da amsa ga abubuwan da suka faru tare da ƙarancin latency, waɗannan ƙananan farashi na iya haɗawa zuwa macro-level lag, yana shafar komai daga tsarar rahoto zuwa sabunta dashboard na ainihi.

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