chettha-kesu amalu samayam

ganana pani yokka chettha-kesu amalu samayam (wcet) anedi oka nirdishta hardware platformlo panini amalu cheyadaaniki patte garishta samayam.
idhi deniki upayoginchabadutundi.
chettha kesu amalu samayam saadhaaranamgaa nammadagina nija-samaya vyavasthalalo upayoginchabadutundi, ikkada software yokka chettha kesu samaya pravartananu ardham chesukovadam viswasaneeyata ledhaa saraina kriyaatmaka pravartanaku mukhyam. 
udaaharanaku, vaahanamlooni injin pravartananu niyantrinche computer vyavastha nirdishta vyavadhilo inputlaku pratispandinchaalsi untundi. pratispandana samayanni tayaaru chese oka bhaagam softwarenu amalu cheyadaaniki gadipina samayam-anduvalla software chettha amalu samayanni nirnayinchagaligithe, appudu system yokka designer dheenini schedulability vislaeshanha vanti itara paddhathulatho upayoginchavacchu, tadwara system taginanta vaegamgaa spandistundani nirdhaarinchukovachchu.
doublueset aneka nija-samaya vyavasthalaku vartinche avakaasam unnappatikee, aacharanalo doublueset yokka haamii pradhanamgaa adhika viswasaneeyata ledhaa bhadrataku sambandhinchina nija-samaya vyavasthala dwara upayoginchabadutundi. udaaharanaku, udaaharanaku vibhagam 6.3.4 prakaram airbourne softwarelo softwearpy kontha shraddha avasaram. automotive vyavasthalalo software vadakam peragadam kooda software yokka doublucity vislaeshanhanu upayoginchaalsina avasaranni penchutondi.
konni vyavasthala roopakalpanalo, wcet tarachugaa schedulability vislaeshanhaku inputgaa upayoginchabadutundi, ayithe klishtamaina vyavasthalalo wcet yokka chaalaa saadhaarana upayogam arink 653 vanti vibhajana-schedule vyavasthalo mundugaa ketaayinchina samaya budjetlu ullanghinchabadakunda chusukovadam.
ganana.
embeded computing prarambha rojula nundi, embeded software developerlu veetini upayoginchaaruh
eee rendu saanketikatalaku parimitulu unnaayi. end tuu end kolatalu sudeerghamaina marganni saadhinchadaaniki software pareekshapai adhika bhaaram vestaayi; lekkimpu suuchanalu saadhaarana software mariyu hardwarelaku matrame vartistaayi. rendu sandarbhaallo, pareekshinchani code, hardware paniteeru anchanaalu ledhaa tappulanu lekkinchadaaniki lopam kosam oka anchu tarachugaa upayoginchabadutundi. chaaritraka vishwaasam ("idhi chivarisariga panichesindi") tappa, eee sankhyaku chaalaa takkuva samarthana upayoginchinappatiki, 20 saatam margine tarachugaa upayoginchabadutundi. 
software mariyu hardware sanklishtata peragadamtho, avi sadhana maddatu avasaranni penchaayi. sthira vislaeshanha mariyu kolatalu rendintiloonuu sanklishtata anedi oka samasyaga maarutondi. error margine entha vedalpugaa undaali mariyu software system entha baga pareekshinchabadindo anchanaa veyadam kashtam. pareeksha samayamlo saadhinchina adhika-neeti gurthupai aadhaarapadina vyavastha bhadrata vaadanalu vistrutamgaa upayoginchabadataayi, conny software mariyu hardware takkuva oohinchadaginavigaa maaradamtho samarthinchadam kashtam avutundi.
bhavishyattulo, bhadrata klishtamaina vyavasthalaku oka avasaram emitante avi sthiramaina mariyu kolata-aadhaarita vidhaanaalanu upayoginchi vislaeshimchabadataayi.
parigananalu.
vislaeshanha dwara wcetni kanugone samasya aagipoye samasyatho samanam, anduvalla saadhaaranamgaa parishkarinchalemu. adrushtavasaattuu, injaneerlu saadhaaranamgaa vesset kosam vetakaalanukune vyavasthala kosam, software saadhaaranamgaa baga nirmanatmakamga untundi, ellappuduu mugustundi mariyu vislaeshimchadaginadi.
oka wcetni kanugonadaaniki chaalaa paddhatulu ujjaayimpulanu kaligi untaayi (saadhaaranamgaa anischitulu unnappudu paiki gundramgaa), anduvalla aacharanalo khachitamaina wcetni tarachugaa saadhinchalenidigaa pariganistaaru. badulugaa, wcetni kanugonadaaniki vividha paddhatulu wcet kosam anchanaalanu utpatti chestaayi. aaa anchanaalu saadhaaranamgaa niraasaavaadulu, antey anchanaa vesina wcet nijamaina wcet kante ekkuvagaa untundani telustundi (idhi saadhaaranamgaa kaavalasinadi). vislaeshanhaloo niraasaavaadaanni tagginchadampai doubluciity vislaeshanhapai chaalaa pani undhi, tadwara anchanaa vesina viluva system designerku viluvainadigaa undentha takkuvagaa untundi.
wcet vislaeshanha saadhaaranamgaa oke thread, pani ledhaa prakriya yokka amalu samayanni suuchistumdi. ayithe, aadhunika hardwarelo, mukhyamgaa multy-korlo, vyavasthalooni itara panulu kaash, memory linelu mariyu itara hardware lakshanaalanu panchukunte icchina pani yokka doubluesitnu prabhaavitam chestaayi. inca, oka nirdishta vyavasthalo sambhavinchagaladaa ledhaa addamkulu vanti task scheduling eeventlanu wcet vislaeshanhaloo pariganinchaali. anduvalla, wcet vislaeshanha vartinche sandarbhaanni parigananaloki teesukovadam mukhyam.
svayamchaalaka vidhanalu.
paina perkonna manueval paddhatulaku minchi wcetni lekkinchadaaniki aneka svayamchaalaka vidhanalu unnaayi. veetilo ivi unnaih
sthira vislaeshanha paddhatulu.
oka sthiramaina wcet sadhanam computer softwarenu hardwarelo neerugaa amalu cheyakunda pariseelinchadam dwara wcetni anchanaa vaeyadaaniki prayatnistundi. 1980la chivari nundi sthira vislaeshanha paddhatulu eee praantamloo parisoedhanaloo aadhipatyam chelayinchayi, ayithe paarisraamika nepadhyamlo, end-tuu-end kolatala vidhanalu praamaanika abhyasamga undevi.
sthira vislaeshanha sadhanalu programme yokka pani yokka nirmaanaanni nirnayinchadaaniki unnata sthaayilo panicheestaayi, soars code yokka bhagampai ledhaa vidadeesina binary executable meeda panicheestaayi. vaaru takkuva sthaayilo kooda pani chestaaru, pani amalu chese nijamaina hardware gurinchi samaya samacharanni, daani anni nirdishta lakshanaalatoo upayogistaaru. aaa rendu rakaala vislaeshanhalanu kalapadam dwara, icchina hardware platformlo icchina panini amalu cheyadaaniki avasaramaina samayaniki eguva parimitini ivvadaaniki sadhanam prayatnistundi.
takkuva-sthaayi vadda, sthiramaina wcet vislaeshanha anedi processor yokka sagatu-cases paniteerunu merugupariche nirmaana lakshanaala uniki dwara sanklishtamgaa untundih udaaharanaku, bodhana/dayta kaash, saakha anchanaa mariyu bodhana pipelinelu. vislaeshanha upayoginche samaya namoonaalo eee aadhunika nirmaana lakshanaalanu parigananaloki teesukunte, gatti parimitulanu nirnayinchadam saadhyame, conny marinta kashtam.
anduvalla european aviation safety agency vanti dhruvikarana adhikarulu modal dhruveekarana suutlapai aadhaarapadataaru. 
sthira vislaeshanha saralamaina hardwareku manchi phalitaalaku daariteesindi, ayithe sthira vislaeshanha yokka saadhyamaina parimiti emitante hardware (mukhyamgaa cpu) sanklishtataku cherukundi, idhi modal cheyadam chaalaa kashtam. mukhyamgaa, modeling prakriya aneka muulaala nundi lopaalanu parichayam cheyavachuhu chip designlo lopaalu, documentation lekapovadam, documentationlo lopaalu, modal srushtilo lopaalu; annee modal nijamaina hardwarelo gamaninchinadaaniki bhinnamaina pravartananu anchanaa vese sandarbhaalaku daariteestaayi. saadhaaranamgaa, oka pravartananu khachitamgaa anchanaa veyadam saadhyam kaani chota, niraasaavaada phalitam upayoginchabadutundi, idhi runn-timelo saadhinchina edainaa kante chaalaa peddadigaa anchanaa vaeyadaaniki daariteestundi. 
multy-core processorlapy gatti static wcet anchanaanu pondadam mukhyamgaa kashtam. 
vividha rakaala sthira vislaeshanhalanu amalu chese aneka vaanijya mariyu vidya sadhanalu unnaayi.
kolata mariyu hybrid paddhatulu.
kolata-aadhaarita mariyu hybrid vidhanalu saadhaaranamgaa nijamaina hardwarelo chinna code vibhagala amalu samayaalanu kolavadaniki prayatnistaayi, ivi taruvaata unnata sthaayi vislaeshanhaloo militam cheyabadataayi. sadhanalu software yokka nirmaanaanni parigananaloki teesukuntaayi (udhaa.zii. looplu, saakhalu), pedda programme yokka wcet anchanaanu utpatti cheyadaaniki. sanklishtamaina softwarelo podavaina marganni pareekshinchadam kashtam, conny daanilooni aneka chinna bhagalalo podavaina marganni pareekshinchadam sulabham. vislaeshanha daani vislaeshanhaloo itara chettha kesu sanghatanalatho militam cheyagalagadaaniki pareeksha samayamlo chettha kesu prabhavanni okasari matrame chuudaalsina avasaram undhi.
saadhaaranamgaa, software yokka chinna vibhaagaalanu instrumentation (softwareku maarkarlanu jodinchadam) vanti paddhatulanu upayoginchi ledhaa debuggerlu mariyu cpu hardware tracing modules vanti hardware maddatutoe svayamchaalakamgaa kolavavacchu. eee gurtulu amalu yokka jadaku daariteestaayi, indulo programme dwara teesukunna maargam mariyu ververu paayintlu amalu cheyabadina samayam rendoo untaayi. programme yokka prati bhaagam amalu cheyadaaniki teesukunna garishta samayam, prati loop yokka garishta pariseelinchina punaraavruta samayam entha mariyu software yokka pareekshinchani bhagalu evaina unnaya (code coverage) anie nirnayinchadaaniki trace vislaeshimchabadutumdi.
kolata-aadhaarita wcet vislaeshanha saralamaina mariyu sanklishtamaina hardware rendintikee manchi phalitaalanu ichindi, ayithe sthiramaina vislaeshanha vale idhi bahula-core paristhitulalo adhika niraasaavaadaanni edurkontundi, ikkada oka core yokka prabhavanni marokadaanipai nirvachinchadam kashtam. kolata yokka parimiti emitante, idhi pareeksha samayamlo chettha-sandarbha prabhavalanu gamaninchadampai aadharapadi untundi (ayithe adhe samayamlo tappanisarigaa kaadu). chettha kesu prabhavalu tappanisarigaa pareekshinchabadindo ledho gurtinchadam kashtam.
vividha rakaala kolata aadhaarita vislaeshanhalanu amalu chese aneka vaanijya mariyu vidya sadhanalu unnaayi.
parisoedhana.
atyanta churukaina parisoedhanaa samuuhaalu sweeden (mallardlen, linkoping), germany (sarbrooken, dortmund, brounshweig), france (tolouse, sackley, rens), austria (vienna), yuke (university off yark und rapita systems limited), italii (bologna), speyin (contabria, valencia), mariyu switzerland (jurich) loe unnaayi. iteevala, code-sthaayi samaya vislaeshanha amsam airopa velupala america (uttara kerolina, florida), kenada, australia, bangladesh (mbi lyab mariyu rds), soudhi arabia-yuk (hii lyab), singapur mariyu bharatadesam (iit madrasu, iisc bengaluru) looni parisoedhanaa samuuhaalachae marinta drushtini aakarshinchindi.
Wcet tool chhalenj.
modati antarjaateeya Wcet sadhanam savaalu 2006 saradrutuvulo jarigindi. idhi university off malardalen chetha nirvahinchabadindi mariyu embeded systems designpy artiste 2 network off exalence spaansar cheyabadindi. chettha-kesu amalu samayanni vislaeshimchadamloe vividha vidhaanaalanu tanikhi cheyadam mariyu polchadam savaalu yokka lakshyam. panula kosam surakshitamaina eguva sarihaddulanu nirnayinchagala anni andubaatulo unna sadhanalu mariyu namuunaalu palgonnayi. tudi phalitaalanu november november cyprus looni paphoslo jarigina isola 2006 antarjaateeya sadassulo samarpinchaaru.
samarpinchaaru rendava savaalu jarigindi.

