{"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\/sk\/blog\/news\/dlya-yadra-linux-predlozhena-realizacziya-funkczii-memchr-rabotayushhaya-do-4-raz-bystree","title":{"rendered":"Pre Linux jadra bola navrhnut\u00e1 implement\u00e1cia funkcie memchr, ktor\u00e1 je a\u017e 4-kr\u00e1t r\u00fdchlej\u0161ia.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Na zaradenie do jadra Linux bol navrhnut\u00fd s\u00fabor opr\u00e1v s optimalizovanou implement\u00e1ciou funkcie memchr(), ktor\u00e1 sa pou\u017e\u00edva na vyh\u013ead\u00e1vanie znaku v poli. Na rozdiel od starej verzie, ktor\u00e1 pou\u017e\u00edvala porovn\u00e1vanie po byte, je navrhnut\u00e1 implement\u00e1cia postaven\u00e1 so zoh\u013eadnen\u00edm pln\u00e9ho vyu\u017eitia 64- a 32-bitov\u00fdch registrov CPU. Namiesto bytov sa porovnanie vykon\u00e1va pomocou strojov\u00fdch slov, \u010do umo\u017e\u0148uje porovn\u00e1va\u0165 minim\u00e1lne 4 byty naraz. <\/p>\n

Pri vyh\u013ead\u00e1van\u00ed vo ve\u013ek\u00fdch re\u0165azcoch sa nov\u00fd variant uk\u00e1zal by\u0165 pribli\u017ene 4-kr\u00e1t r\u00fdchlej\u0161\u00ed ako star\u00fd (napr\u00edklad pre re\u0165azce s 1000 znakmi). Pre mal\u00e9 re\u0165azce nie je efekt\u00edvnos\u0165 novej implement\u00e1cie tak\u00e1 v\u00fdrazn\u00e1, ale st\u00e1le je vy\u0161\u0161ia v porovnan\u00ed s p\u00f4vodnou verziou. V jadre Linux dosahuje ve\u013ekos\u0165 spracov\u00e1van\u00fdch re\u0165azcov v memchr() 512 bytov. N\u00e1rast v\u00fdkonu pre 512-bytov\u00e9 re\u0165azce, v situ\u00e1cii, ke\u010f sa h\u013eadan\u00fd znak nach\u00e1dza na konci re\u0165azca, predstavuje 20%. <\/p>\n

Testovanie jadra 5.18 s novou verziou «memchr()» pre 32- a 64-bitov\u00e9 architekt\u00fary neodhalilo \u017eiadne probl\u00e9my. Celkov\u00fd pr\u00edrastok v\u00fdkonu subsyst\u00e9mov jadra pri pou\u017eit\u00ed optimalizovanej verzie «memchr()» zatia\u013e nebol vyhodnoten\u00fd, taktie\u017e nebola analyzovan\u00e1 vhodnos\u0165 nahradenia implement\u00e1cie (v k\u00f3de jadra sa volanie funkcie memchr() vyskytuje 129-kr\u00e1t, vr\u00e1tane v k\u00f3de ovl\u00e1da\u010dov a s\u00faborov\u00fdch syst\u00e9mov).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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