{"id":168709,"date":"2026-04-14T17:12:49","date_gmt":"2026-04-14T15:12:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dostupna-biblioteka-upravleniya-pamyatyu-jemalloc-5-3-1"},"modified":"2026-04-14T17:12:49","modified_gmt":"2026-04-14T15:12:49","slug":"dostupna-biblioteka-upravleniya-pamyatyu-jemalloc-5-3-1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupna-biblioteka-upravleniya-pamyatyu-jemalloc-5-3-1","title":{"rendered":"K dispozici je knihovna pro spr\u00e1vu pam\u011bti jemalloc 5.3.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Po 4 letech od vyd\u00e1n\u00ed posledn\u00ed aktualizace je k dispozici vyd\u00e1n\u00ed knihovny pro spr\u00e1vu pam\u011bti jemalloc 5.3.1, kter\u00e1 nab\u00edz\u00ed alternativn\u00ed implementaci funkc\u00ed malloc, optimalizovan\u00fdch pro sn\u00ed\u017een\u00ed fragmentace a efektivn\u00ed pr\u00e1ci na v\u00edcej\u00e1drov\u00fdch syst\u00e9mech. Pro \u0159e\u0161en\u00ed probl\u00e9m\u016f se z\u00e1mky na v\u00edcej\u00e1drov\u00fdch syst\u00e9mech pou\u017e\u00edv\u00e1 jemalloc pro ka\u017ed\u00e9 CPU sv\u00e9 izolovan\u00e9 oblasti alokace pam\u011bti, co\u017e umo\u017e\u0148uje dos\u00e1hnout line\u00e1rn\u00ed \u0161k\u00e1lovatelnosti s rostouc\u00edm po\u010dtem vl\u00e1ken.     <\/p>\n<p>V \u010dervnu 2025 autor projektu ukon\u010dil jeho podporu a p\u0159evedl repozit\u00e1\u0159 jemalloc do archiva\u010dn\u00edho re\u017eimu, av\u0161ak p\u0159ed m\u011bs\u00edcem obnovila v\u00fdvoj spole\u010dnost Meta, kter\u00e1 jemalloc vyu\u017e\u00edv\u00e1 ve sv\u00e9 infrastruktu\u0159e. Knihovna byla p\u016fvodn\u011b vyvinuta pro FreeBSD a od roku 2005 je pou\u017e\u00edv\u00e1na jako v\u00fdchoz\u00ed v t\u00e9to operativn\u00ed soustav\u011b. K\u00f3d knihovny je naps\u00e1n v jazyce C a je distribuov\u00e1n pod licenc\u00ed BSD.      <\/p>\n<p>Mezi zm\u011bnami:  <\/p>\n<ul>\n<li class=\"l\"> Byla implementov\u00e1na funkce pvalloc, kter\u00e1 m\u016f\u017ee b\u00fdt u\u017eite\u010dn\u00e1 p\u0159i nahrazov\u00e1n\u00ed alok\u00e1toru pam\u011bti libc.\n<li class=\"l\"> V lad\u00edc\u00edch sestaven\u00edch je zahrnut re\u017eim detekce dvoj\u00edho vol\u00e1n\u00ed funkce free(). Pro nastaven\u00ed velikosti z\u00e1sobn\u00edku, v r\u00e1mci kter\u00e9ho se prov\u00e1d\u00ed skenov\u00e1n\u00ed, byl p\u0159id\u00e1n parametr debug_double_free_max_scan.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost kompilace &#171;&#8212;enable-pageid&#187; pro nastaven\u00ed tag\u016f p\u0159i mapov\u00e1n\u00ed pam\u011bti pomoc\u00ed prctl s p\u0159\u00edznakem PR_SET_VMA. Po aktivaci lze mapov\u00e1n\u00ed sledovat p\u0159es \/proc\/\/maps.\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr &#171;prof_bt_max&#187;, kter\u00fd umo\u017e\u0148uje nastavit maxim\u00e1ln\u00ed hloubku z\u00e1sobn\u00edku pro profilov\u00e1n\u00ed.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost kompilace &#171;&#8212;enable-force-getenv&#187; pro pou\u017eit\u00ed v k\u00f3du b\u011b\u017en\u00e9 funkce getenv() m\u00edsto chr\u00e1n\u011bn\u00e9 secure_getenv().\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost kompilace &#171;&#8212;disable-dss&#187; pro vypnut\u00ed pou\u017eit\u00ed funkce sbrk().\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr &#171;tcache_ncached_max&#187; pro omezen\u00ed po\u010dtu prvk\u016f v cache vl\u00e1ken.\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr &#171;calloc_madvise_threshold&#187; pro nastaven\u00ed pou\u017e\u00edv\u00e1n\u00ed mechanismu j\u00e1dra madvise nebo funkce memset pro nulov\u00e1n\u00ed pam\u011bti alokovan\u00e9 p\u0159es funkci calloc.\n<li class=\"l\"> Byla p\u0159id\u00e1na mo\u017enost kompilace &#171;&#8212;disable-user-config&#187; pro vypnut\u00ed na\u010d\u00edt\u00e1n\u00ed nastaven\u00ed z souboru \/etc\/malloc.conf nebo prom\u011bnn\u00e9 prost\u0159ed\u00ed MALLOC_CONF.\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr &#171;process_madvise_max_batch&#187; pro omezen\u00ed po\u010dtu blok\u016f pam\u011bti pro ka\u017edou d\u00e1vkovou operaci madvise.\n<li class=\"l\"> Byl p\u0159id\u00e1n parametr &#171;disable_large_size_classes&#187; pro vypnut\u00ed nov\u00e9ho algoritmu v\u00fdpo\u010dtu velikosti alokovan\u00e9 pam\u011bti, kter\u00fd sni\u017euje re\u017eijn\u00ed n\u00e1klady p\u0159i alokaci blok\u016f v\u011bt\u0161\u00edch ne\u017e 4 str\u00e1nky pam\u011bti.\n<li class=\"l\"> Do n\u00e1stroje mallctl byly p\u0159id\u00e1ny mo\u017enosti: opt.prof_bt_max, arena.&lt;i&gt;.name, thread.tcache.max, thread.tcache.ncached_max.write, thread.tcache.ncached_max.read_sizeclass, arenas.hugepage a approximate_stats.active.      <\/ul>\n<p>Zdroj: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65201\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u043f\u0443\u0441\u0442\u044f 4 \u0433\u043e\u0434\u0430 \u043f\u043e\u0441\u043b\u0435 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0448\u043b\u043e\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u044c\u044e jemalloc 5.3.1, \u043f\u0440\u0435\u0434\u043b\u0430\u0433\u0430\u044e\u0449\u0435\u0439 \u0430\u043b\u044c\u0442\u0435\u0440\u043d\u0430\u0442\u0438\u0432\u043d\u0443\u044e \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u0444\u0443\u043d\u043a\u0446\u0438\u0439 malloc, \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0443\u044e \u0434\u043b\u044f \u0441\u043d\u0438\u0436\u0435\u043d\u0438\u044f \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u0438 \u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u043d\u0430 \u043c\u043d\u043e\u0433\u043e\u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445. \u0414\u043b\u044f \u0440\u0435\u0448\u0435\u043d\u0438\u044f \u043f\u0440\u043e\u0431\u043b\u0435\u043c \u0441 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043a\u0430\u043c\u0438 \u043d\u0430 \u043c\u043d\u043e\u0433\u043e\u044f\u0434\u0435\u0440\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445 \u0432 jemalloc \u0434\u043b\u044f \u043a\u0430\u0436\u0434\u043e\u0433\u043e \u044f\u0434\u0440\u0430 CPU \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0441\u0432\u043e\u044f \u0438\u0437\u043e\u043b\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u0430\u044f \u043e\u0431\u043b\u0430\u0441\u0442\u044c \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438, \u0447\u0442\u043e \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u0435\u0442 \u0434\u043e\u0431\u0438\u0442\u044c\u0441\u044f \u043b\u0438\u043d\u0435\u0439\u043d\u043e\u0439 \u043c\u0430\u0441\u0448\u0442\u0430\u0431\u0438\u0440\u0443\u0435\u043c\u043e\u0441\u0442\u0438 \u043f\u0440\u0438 \u0440\u043e\u0441\u0442\u0435 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-168709","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0421\u043f\u0443\u0441\u0442\u044f 4 \u0433\u043e\u0434\u0430 \u043f\u043e\u0441\u043b\u0435 \u043f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u0438 \u043f\u0440\u043e\u0448\u043b\u043e\u0433\u043e \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u044f \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f 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spr\u00e1vu pam\u011bti jemalloc 5.3.1, kter\u00e1 nab\u00edz\u00ed alternativn\u00ed implementaci funkc\u00ed malloc, optimalizovan\u00fdch pro sn\u00ed\u017een\u00ed fragmentace a.","canonical_url":"https:\/\/prohoster.info\/cs\/blog\/news\/dostupna-biblioteka-upravleniya-pamyatyu-jemalloc-5-3-1","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"cs_CZ","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47\u0414\u043e\u0441\u0442\u0443\u043f\u043d\u0430 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0430 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f 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