{"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 tuumale on pakkuda memchr funktsiooni rakendust, mis t\u00f6\u00f6tab kuni 4 korda kiiremini.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Linuxi tuumasse on ettepanekuks pakkuda t\u00e4iustatud memchr() funktsiooni rakendust, mida kasutatakse m\u00e4rke leidmiseks massiivis. Erinevalt vanast variandist, kus kasutati baitide v\u00f5rdlemist, on ettepanek p\u00f5hinenud t\u00e4ielikul 64- ja 32-bitiste CPU registrite kasutamisel. Baitide asemel toimub v\u00f5rdlemine masinas\u00f5nade abil, mis v\u00f5imaldab \u00fche korraga v\u00f5rrelda v\u00e4hemalt 4 baiti. <\/p>\n

Suurtel stringidel on uus variant osutunud umbes 4 korda kiiremaks kui vana (n\u00e4iteks 1000 m\u00e4rke sisaldavate stringide puhul). V\u00e4ikeste stringide puhul ei ole uue rakenduse efektiivsus nii oluline, kuid see on siiski k\u00f5rgem v\u00f5rreldes algse variandiga. Linuxi tuumas ulatub memchr() t\u00f6\u00f6deldavate stringide suurus 512 baitini. 512 baitiste stringide puhul, kui otsitav m\u00e4rk asub stringi l\u00f5pus, on j\u00f5udluse kasv 20%. <\/p>\n

Kernel 5.18 test with the new variant of «memchr()» for 32- and 64-bit architectures did not reveal any issues. The overall performance improvement of the kernel subsystems when using the optimized variant of «memchr()» has not yet been assessed, nor has the feasibility of replacing the implementation been analyzed (the function memchr() is called 129 times in the kernel code, including in drivers and file systems).
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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