{"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\/it\/blog\/novosti-interneta\/dostupna-biblioteka-upravleniya-pamyatyu-jemalloc-5-3-1","title":{"rendered":"\u00c8 disponibile la libreria di gestione della memoria jemalloc 5.3.1","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>A quattro anni dalla pubblicazione dell'ultima versione, \u00e8 disponibile il rilascio della libreria di gestione della memoria jemalloc 5.3.1, che offre un'alternativa implementativa delle funzioni malloc, ottimizzata per ridurre la frammentazione e lavorare su sistemi multiprocessore. Per affrontare i problemi di blocco su sistemi multicore, jemalloc utilizza un'area di allocazione della memoria isolata per ciascun core della CPU, permettendo cos\u00ec di ottenere una scalabilit\u00e0 lineare con l'aumento del numero di thread.     <\/p>\n<p>Nel giugno 2025, l'autore del progetto ha interrotto il supporto e ha messo il repository di jemalloc in modalit\u00e0 archivio, ma un mese fa lo sviluppo \u00e8 stato ripreso dall'azienda Meta, che utilizza jemalloc nella propria infrastruttura. Inizialmente, la libreria \u00e8 stata sviluppata per FreeBSD ed \u00e8 utilizzata in questo sistema operativo come impostazione predefinita dal 2005. Il codice della libreria \u00e8 scritto in C ed \u00e8 distribuito sotto licenza BSD.      <\/p>\n<p>Tra le novit\u00e0:  <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata implementata la funzione pvalloc, utile per sostituire l'allocatore di memoria libc.\n<li class=\"l\"> Nelle build di debug \u00e8 abilitata la modalit\u00e0 di rilevamento della doppia chiamata alla funzione free(). \u00c8 stato aggiunto il parametro debug_double_free_max_scan per impostare la dimensione dello stack all'interno del quale viene eseguita la scansione.\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione di compilazione &#171;&#8212;enable-pageid&#187; per l'impostazione dei tag durante il mapping della memoria, utilizzando prctl con il flag PR_SET_VMA. Una volta abilitato, il mapping pu\u00f2 essere monitorato tramite \/proc\/\/maps.\n<li class=\"l\"> \u00c8 stato aggiunto il parametro &#171;prof_bt_max&#187;, che consente di impostare la profondit\u00e0 massima dello stack per il profiling.\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione di compilazione &#171;&#8212;enable-force-getenv&#187; per utilizzare nel codice la funzione standard getenv() invece di secure_getenv() protetta.\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione di compilazione &#171;&#8212;disable-dss&#187; per disabilitare l'uso della funzione sbrk().\n<li class=\"l\"> \u00c8 stato aggiunto il parametro &#171;tcache_ncached_max&#187; per limitare il numero di elementi nella cache dei thread.\n<li class=\"l\"> \u00c8 stato aggiunto il parametro &#171;calloc_madvise_threshold&#187; per configurare l'uso del meccanismo del kernel madvise o della funzione memset per azzerare la memoria allocata tramite la funzione calloc.\n<li class=\"l\"> \u00c8 stata aggiunta l'opzione di compilazione &#171;&#8212;disable-user-config&#187; per disattivare il caricamento delle impostazioni dal file \/etc\/malloc.conf o dalla variabile d'ambiente MALLOC_CONF.\n<li class=\"l\"> \u00c8 stato aggiunto il parametro &#171;process_madvise_max_batch&#187; per limitare il numero di blocchi di memoria per ogni operazione di batch madvise.\n<li class=\"l\"> Aggiunto il parametro &#171;disable_large_size_classes&#187; per disabilitare il nuovo algoritmo di calcolo della dimensione della memoria allocata, riducendo i costi di overhead per l'allocazione di blocchi di dimensione superiore a 4 pagine di memoria.\n<li class=\"l\"> Nell'utilit\u00e0 mallctl sono state aggiunte le opzioni: 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 e approximate_stats.active.      <\/ul>\n<p>Fonte: <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-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All 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