Waɗannan uku suna bayyana abubuwa daban-daban kuma ana ci gaba da ruɗe su. Latency shine jinkiri — tsawon lokacin da sashin bayanai ɗaya ke ɗauka don tafiya daga A zuwa B (an auna cikin lokaci, misali ms). Bandwidth shine — matsakaicin ƙimar bayanan da hanya za ta iya ɗauka (misali Gbps). shine ƙimar da kake samu a aikace, wanda galibi ke ƙasa da bandwidth. Kwatancin bututu yana sa ya bayyana:
├────────────── length of pipe = LATENCY (how long to traverse) ─────────────┤
╔══════════════════════════════════════════════════════════════════════════╗
║ width of pipe = BANDWIDTH (max capacity) ║
║ water actually flowing = THROUGHPUT (real achieved rate ≤ bandwidth) ║
╚══════════════════════════════════════════════════════════════════════════╝
Mafi muhimmanci, bututu mafi faɗi ba ya sa ya zama mafi guntu: ƙara bandwidth ba ya rage latency. Hanya mai ƙarfi ta ƙetaren Atlantic har yanzu tana da ~80 ms na latency na zagaye wanda nesa da saurin haske suka ƙayyade — ba za ka iya siyan hanyar shiga ƙasa da shi ba. Wannan shine dalilin da yasa latency, ba bandwidth ba, ke mamaye jin daɗin aikace-aikace masu hulɗa: kowane zagaye (DNS, TCP handshake, TLS, sannan request) yana biyan harajin latency, kuma suna tarawa.
Latency da throughput suna hulɗa ta Bandwidth-Delay Product (BDP = bandwidth × round-trip time), adadin bayanan da ke "tafiya" don kiyaye bututu cike. A kan "long fat network" mai bandwidth mai yawa, latency mai yawa, protocol kamar TCP da ke jira ACKs ba zai iya cika bututu ba sai idan taga nasa yana aƙalla BDP — don haka throughput ya ƙare an iyakance da latency, ba bandwidth ba. Wannan shine dalilin da yasa stream ɗaya na TCP a kan nesa mai nisa galibi ke yin rashin nasara ko a kan hanya mai sauri, kuma me yasa parallelism, manyan tagogi, da CDNs (waɗanda ke yanke nesa, don haka latency) suke taimakawa.
Ruɗe waɗannan uku ɗaya ne daga cikin kurakuran aiki da suka fi yawaita — kuma masu tasiri: ƙungiyoyi suna siyan ƙarin bandwidth don gyara abin da a zahiri matsalar latency ce sannan ba sa ganin ci gaba. Fahimtar senior shine cewa latency ƙasa ce da physics ke saitawa (nesa) wanda kake kaiwa hari ta hanyar architecture — sanya servers/CDNs kusa da masu amfani, rage zagaye (sake amfani da haɗi, HTTP/3, caching), da haɗa requests — yayin da bandwidth abu ne da galibi za ka iya samarwa kawai. Fahimtar BDP yana bayyana sakamako masu saɓawa da hankali kamar hanya "mai sauri" da ke isar da tura stream ɗaya a hankali, wanda shine ainihin nau'in tunanin da ake sa ran lokacin da kake tsara ko gyara tsarin da suka rarraba ta geography, masu babban aiki.
Ɗakin karatu na tambayoyin hira na IT tare da amsoshi cikakke — daga Junior zuwa Senior.
Ba da Gudummawa