{"id":104635,"date":"2022-07-12T09:36:46","date_gmt":"2022-07-12T07:36:46","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-yadra-linux-predlozhena-realizacziya-funkczii-memchr-rabotayushhaya-do-4-raz-bystree"},"modified":"2022-07-12T09:36:46","modified_gmt":"2022-07-12T07:36:46","slug":"dlya-yadra-linux-predlozhena-realizacziya-funkczii-memchr-rabotayushhaya-do-4-raz-bystree","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/dlya-yadra-linux-predlozhena-realizacziya-funkczii-memchr-rabotayushhaya-do-4-raz-bystree","title":{"rendered":"Pentru kernelul Linux a fost propus\u0103 o implementare a func\u021biei memchr, care func\u021bioneaz\u0103 de p\u00e2n\u0103 la 4 ori mai repede","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pentru a fi inclus \u00een nucleul Linux, a fost propus un set de patch-uri cu o implementare optimizat\u0103 a func\u021biei memchr(), utilizat\u0103 pentru a c\u0103uta un caracter \u00eentr-un array. Spre deosebire de vechea variant\u0103, care utiliza compararea pe byte-uri, implementarea propus\u0103 este construit\u0103 av\u00e2nd \u00een vedere utilizarea complet\u0103 a registrelor CPU de 64 \u0219i 32 de bi\u021bi. \u00cen loc de byte-uri, compararea se face folosind cuvinte ma\u0219in\u0103, ceea ce permite compararea a cel pu\u021bin 4 byte-uri dintr-o dat\u0103. <\/p>\n

Atunci c\u00e2nd se caut\u0103 \u00een \u0219iruri mari, noua variant\u0103 s-a dovedit a fi de aproximativ 4 ori mai rapid\u0103 dec\u00e2t vechea (de exemplu, pentru \u0219iruri de 1000 de caractere). Pentru \u0219iruri de dimensiuni mici, eficien\u021ba noii implement\u0103ri nu este at\u00e2t de semnificativ\u0103, dar este totu\u0219i mai mare comparativ cu varianta ini\u021bial\u0103. \u00cen nucleul Linux, dimensiunea \u0219irurilor procesate \u00een memchr() ajunge la 512 byte-uri. Cre\u0219terea performan\u021bei pentru \u0219irurile de 512 byte-uri, \u00een situa\u021bia \u00een care caracterul c\u0103utat se afl\u0103 la sf\u00e2r\u0219itul \u0219irului, este de 20%. <\/p>\n

Testarea nucleului 5.18 cu noua variant\u0103 \u201ememchr()\u201d pentru arhitecturi de 32 \u0219i 64 de bi\u021bi nu a relevat probleme. Cre\u0219terea general\u0103 a performan\u021bei subsistemelor nucleului prin utilizarea variantei optimizate \u201ememchr()\u201d nu a fost evaluat\u0103 p\u00e2n\u0103 acum, iar fezabilitatea \u00eenlocuirii implement\u0103rii nu a fost analizat\u0103 (\u00een codul nucleului, apelul func\u021biei memchr() apare de 129 de ori, inclusiv \u00een codul driverelor \u0219i al sistemelor de fi\u0219iere).
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043b\u044f \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u044f \u0432 \u0441\u043e\u0441\u0442\u0430\u0432 \u044f\u0434\u0440\u0430 Linux \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0441 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u0444\u0443\u043d\u043a\u0446\u0438\u0438 memchr(), \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u043e\u0439 \u0434\u043b\u044f \u043f\u043e\u0438\u0441\u043a\u0430 \u0441\u0438\u043c\u0432\u043e\u043b\u0430 \u0432 \u043c\u0430\u0441\u0441\u0438\u0432\u0435. \u0412 \u043e\u0442\u043b\u0438\u0447\u0438\u0435 \u043e\u0442 \u0441\u0442\u0430\u0440\u043e\u0433\u043e \u0432\u0430\u0440\u0438\u0430\u043d\u0442\u0430, \u0432 \u043a\u043e\u0442\u043e\u0440\u043e\u043c \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u043b\u043e\u0441\u044c 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\u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0437\u0430 \u0440\u0430\u0437 \u0441\u0440\u0430\u0432\u043d\u0438\u0432\u0430\u0442\u044c […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-104635","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47 Pentru nucleul Linux a fost propus\u0103 o implementare a func\u021biei memchr, care func\u021bioneaz\u0103 de p\u00e2n\u0103 la 4 ori mai repede | ProHoster","description":"Pentru a fi inclus \u00een nucleul Linux, a fost propus un set de patch-uri cu o implementare 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