Waxaad ku jirtaa kooxda deganaanshaha (on-call) ee adeeg shabakad: isu-dheelitirka culayska ka hor kooxda mashiinnada, kaash ka hor kaydka xogta, iyo bartilmaameedka helitaanka 99.9 %. Daqiiqad kasta moodelku wuxuu xisaabiyaa daahitaanka safka, waqtiga xadka, garaacidda kaashka iyo culayska kaydka xogta iyadoo la adeegsanayo qaacidooyin buug-tacliineed — iyo waxa go'aamadaadu ku kacaan.
Dabaqa kooxda mashiinnada. Kordhintiisu wuxuu isla markiiba bilaabaa mashiinno — weli waxay u baahan yihiin daahitaanka bilowga ka hor intaan adeegin.
Raacitaanka bartilmaameedka isticmaalka; ma jiro balaadhin cusub inta mashiinnadu weli bilaabmayaan. Dansan = si sax ah ugu yaraan.
Hoose = boos badan iyo kharash badan. Isticmaalka la cabbiray ma dhaafi karo 100 %, sidaas darteed koox buuxsan waxay kortaa tallaabo-tallaabo oo keliya.
TTL dheer = garaacid badan, laakiin jawaabuhu way da'aysan karaan (da'da celceliska ≈ TTL/2).
Waxay raraan furayaasha inta badan la isticmaalo 6 daqiiqo (+12 % kaydka kaashka daqiiqad kasta) qiimaha 600 weydiin oo dheeraad ah oo kaydka xogta ah/s.
Qayb ka mid ah 30 % mudnaanta hoose (hore-u-rarid, xidhmo, gurguurayaasha raadinta) oo lagu diido isu-dheelitirka culayska "isku day mar dambe".
Sifada culusi waxay ku dartaa 20 ms CPU iyo hal weydiin kaydka xogta codsi kasta. Dansan = hoos u dhac xakamaysan.
Dib ayuu u geliyaa dhismihii ugu dambeeyay ee wanaagsanaa koox cusub (5 daqiiqo, laba jeer la bixiyo), kadibna taraafikada ayuu u beddelaa. Mar kale taabashadu waxay dib u bilaabaysaa diyaarinta; haddii aanay jirin dhis xun oo nool, waxay ku kacaysaa lacag oo kaliya.
| Xawaaraha gubashada (1 saac) | 0.0 × |
|---|---|
| Codsiyo | 1125 req/s |
| Mashiinno adeegaya | 10 |
| Mashiinno bilaabmaya | 0 |
| Heerka garaacidda kaashka | 77 % |
| Isticmaalka kaydka xogta | 19 % |
| Taraafikada la diiday | 0 % |
| Kharashka kooxda mashiinnada | 4.00 $/h |
| Kharashka ilaa hadda | 0.00 $ |
| Da'da celceliska ee jawaabaha kaashka | 30 s |
| Taraafikada dhismaha xun | 0 % |
| Talooyin la heli karo | 100 % |
Dhis cusub ayaa la sii daayaa 09:10. Bishu horeyba way adkayd: kaliya 20 % miisaaniyadda khaladaadka ayaa haray. Daqiiqado ka dib sii deynta, digniinta xawaaraha gubashadu way dhacdaa. Ilaali miisaaniyadda.
Xiriirka adeegga ayaa si dhakhso ah u faafaya, goor subaxdan ka mid ah ayaa lagu filayaa kor-u-kac gaadiid — ma jiro qof ogaada goorta ama intee la eg yahay. Tusaalooyinka cusub maanta waxay qaataan 8 daqiiqo si ay u bilaabmaan. Marka uu yimaado, ku hay khaladaadka iyo dib-u-dhaca hoose adigoon lacag ku lumin awood aan shaqeyn.
Kor ugu sarraysa duhurka, qoraal dayactir ayaa kaashka oo dhan tirtira. Codsi kastaa hadda wuxuu aadaa kaydka xogta, kaas oo loo cabbiray heerka caadiga ah ee 85 % garaacid. Adeegga dib u soo celi adigoon kaydka xogta culayn xad-dhaaf ah.
Xiriir kasta oo jilaha isticmaalo, iyo ilaha uu ka yimid. Mudnaanta lagu calaamadiyay malo-awaal waa hagaajin muunad ah.
λ(t) = base × (1 + 0.25·sin(2π(t + clock − 6 h)/24 h)) × surge(t), clock = time of day at the start (peak at 12:00); count/min ≈ N(60λ, √(60λ)) × (1 + N(0, 0.02))[6]Filasho: tirada shaqaalaha, wakhtiyada adeegga, awoodda kaydka xogta, cabbirka kaashka, xawaaraha buuxinta, qiimaha iyo heerka khaladaadka dhismaha xun waa qiyamyo tusaale ah oo loogu talagalay adeeg shabakad cabbir dhexe ah.N = instances × 16 workers, a = λ·S; C(a, N) = B / (1 − (a/N)(1 − B)), B = Erlang B[3][6]P(W > t) = C·e^(−(N/S − λ)·t); timeouts = P(W > 2 s); a ≥ N ⇒ failed share = 1 − N/a[3]p99 ≈ S·ln 100 + ln(C/0.01)/(N/S − λ) (service + waiting quantile, an approximation)[3][6]Qiyaas: isku-darka quantile-yada adeegga iyo sugitaanka ma aha p99-ka sax ah ee wadarkooda (waxaa laga yaabaa inuu in yar sarreeyo ama hooseeyo); safka waxaa loo daawadaa inuu deggan yahay daqiiqad kasta gudaheeda sababtoo ah codsiyadu waxay qaadanayaan milli-ilbiriqsi.busy workers L = λ·S ⇒ utilization = λ·S / N[4]hit = warm × rT/(1 + rT), r = λ / 20,000 objects; mean age of a cached answer ≈ T/2[5]DB load = λ·q·(1 − hit); query time = 5 ms/(1 − ρ_db) (≤ 250 ms); S = S_app + (1 − hit)·q·query time[6]Filasho: tirada shaqaalaha, wakhtiyada adeegga, awoodda kaydka xogta, cabbirka kaashka, xawaaraha buuxinta, qiimaha iyo heerka khaladaadka dhismaha xun waa qiyamyo tusaale ah oo loogu talagalay adeeg shabakad cabbir dhexe ah.budget = 1 − SLO = 0.1 %; burn = error rate / 0.1 %; Δbudget per min = burn / 43,200; burn (1 h) = mean error rate over the last 60 min / 0.1 % (window pre-filled with the opening minute)[1][2]desired = ⌈serving × utilization / target⌉ (utilization saturates at 100 %); new instances serve after the boot delay[6]Filasho: tirada shaqaalaha, wakhtiyada adeegga, awoodda kaydka xogta, cabbirka kaashka, xawaaraha buuxinta, qiimaha iyo heerka khaladaadka dhismaha xun waa qiyamyo tusaale ah oo loogu talagalay adeeg shabakad cabbir dhexe ah.16 workers/instance · app time 50 ms (+20 ms and +1 query with the feature on) · 2 queries/request · DB 4,000 queries/s · 20,000 hot objects · cache refill τ = 30 min (slower while the DB is saturated) · warm-up job +12 %/min for 6 min, +600 queries/s · timeout 2 s · 30 % low-priority traffic · bad build +5 % errors, ×1.25 CPU · rollback 5 min · $0.40 per instance-hour · scale-in by ≤ 20 % of the fleet after 10 quiet minutes · up to 40 instancesFilasho: tirada shaqaalaha, wakhtiyada adeegga, awoodda kaydka xogta, cabbirka kaashka, xawaaraha buuxinta, qiimaha iyo heerka khaladaadka dhismaha xun waa qiyamyo tusaale ah oo loogu talagalay adeeg shabakad cabbir dhexe ah.Aan-kala-sooc: abuurahaha mulberry32 oo abuur leh; qaybinta la isticmaalay — isku-mid, tibaax (CDF rogan), caadi (Box–Muller), Poisson (Knuth). Abuurka waa la muujiyaa waana la wadaagi karaa.
Moodel waxbarasho — looma isticmaalo go’aamo hawlgal. Goobaha dhabta ahi waxay joogto kasta u hagaajiyaan qalabkooda iyo xogtooda.