{"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\/et\/blog\/news\/dlya-yadra-linux-predlozhena-realizacziya-funkczii-memchr-rabotayushhaya-do-4-raz-bystree","title":{"rendered":"Linuxi tuuma jaoks on v\u00e4lja pakutud memchr-funktsiooni teostus, mis t\u00f6\u00f6tab kuni 4 korda kiiremini","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuuma sisaldusse on ettepanek teha optimeeritud memchr() funktsiooni teostus, mis on m\u00f5eldud s\u00fcmbolite otsimiseks massiivis. Erinevalt vanast variandist, kus kasutati baitide v\u00f5rdlemist, on pakutud teostus \u00fcles ehitatud nii, et kasutatakse t\u00e4ielikult \u00e4ra 64- ja 32-bitiseid CPU registreid. Selle asemel, et v\u00f5rrelda baite, toimub v\u00f5rdlemine masins\u00f5nadega, mis v\u00f5imaldab korraga v\u00f5rrelda v\u00e4hemalt 4 baiti. <\/p>\n

Suurtes stringides on uus variant vanast umbes 4 korda kiirem (n\u00e4iteks 1000 t\u00e4hte sisaldavate stringide puhul). V\u00e4ikeste stringide korral ei ole uue teostuse efektiivsus nii m\u00e4rkimisv\u00e4\u00e4rne, kuid on ikkagi k\u00f5rgem v\u00f5rreldes algse variandiga. Linuxi tuumas ulatub memchr() t\u00f6\u00f6tlevate stringide suurus 512 baitini. 512 baitiste stringide puhul, kui otsitav s\u00fcmbol asub stringi l\u00f5pus, on j\u00f5udluse t\u00f5us 20%. <\/p>\n

Kern 5.18 testimine uue versiooniga \"memchr()\" 32- ja 64-bitiste arhitektuuride jaoks ei tuvastanud mingeid probleeme. \u00dcldiselt ei ole optimeeritud variandi \"memchr()\" kasutamisega seotud kernialuse tulemuste kasvu veel hinnatud, samuti ei ole anal\u00fc\u00fcsitud asendamise otstarbekust (kernikoodis esineb memchr() funktsiooni kutsumine 129 korda, sealhulgas draiverite ja failis\u00fcsteemide koodis).
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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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\udd47Linuxi tuuma jaoks on v\u00e4lja pakutud memchr-funktsiooni teostus, mis t\u00f6\u00f6tab kuni 4 korda kiiremini | ProHoster","description":"Linuxi tuuma sisaldusse on ettepanek teha optimeeritud memchr() funktsiooni teostus, mis on m\u00f5eldud s\u00fcmbolite otsimiseks 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