{"id":167524,"date":"2026-04-04T23:11:54","date_gmt":"2026-04-04T21:11:54","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql"},"modified":"2026-04-04T23:11:54","modified_gmt":"2026-04-04T21:11:54","slug":"v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/v-yadre-linux-7-0-vyyavili-regressiyu-v-dva-raza-snizhayushhuyu-proizvoditelnost-postgresql","title":{"rendered":"\u00cen kernelul Linux 7.0 a fost identificat\u0103 o regresie care reduce de dou\u0103 ori performan\u021ba PostgreSQL.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un inginer de la Amazon a identificat o regresie specific\u0103 pentru nucleul Linux 7.0, ale c\u0103rei lansare este a\u0219teptat\u0103 pe 13 aprilie. Modificarea set\u0103rilor planificatorului de sarcini a dus la o sc\u0103dere semnificativ\u0103 a l\u0103\u021bimii de band\u0103 \u0219i a timpului de reac\u021bie \u00een utilizarea SGBD-ului PostgreSQL pe sisteme cu arhitectur\u0103 ARM64. La utilizarea nucleului 7.0, performan\u021bele \u00een cadrul testului pgbench \u201esimple-update\u201d au sc\u0103zut aproape la jum\u0103tate \u2014 de la 98565 la 50751. <\/p>\n

\u00cencetinirea este cauzat\u0103 de schimbarea modului de eliminare (preemption) \u00een planificatorul implicit de la PREEMPT_NONE la PREEMPT_LAZY pe arhitecturile care suport\u0103 acest mod, ceea ce a dus la faptul c\u0103 \u00een spa\u021biul utilizatorului PostgreSQL a petrecut 55% din timpul CPU apel\u00e2nd s_lock(). Pentru a rezolva problema, s-a propus revenirea la mod implicit PREEMPT_NONE \u0219i \u00eendep\u0103rtarea leg\u0103turii acestuia cu setarea ARCH_NO_PREEMPT. <\/p>\n

Peter Zijlstra, autorul modific\u0103rilor care au provocat regresia \u0219i men\u021bin\u0103torul planificatorului de sarcini \u0219i al subsistemelor asociate cu bloc\u0103rile nucleului, a declarat c\u0103 este necesar\u0103 o corectare \u00een codul PostgreSQL. Pentru a remedia sc\u0103derea performan\u021bei, el a sugerat utilizarea extensiei recent ad\u0103ugate \u00een nucleu \u201erseq slice\u201d (Secven\u021be Restartabile) pentru a limita probabilitatea de eliminare a de\u021bin\u0103torului de blocare. <\/p>\n

P\u00e2n\u0103 acum nu este clar ce decizie va lua Linus Torvalds, care respect\u0103 regula c\u0103 nucleul nu trebuie s\u0103 degradeze performan\u021ba \u0219i s\u0103 rup\u0103 compatibilitatea cu spa\u021biul utilizatorului. Pe de o parte, nucleul 7.0 se afl\u0103 \u00een etapa final\u0103 de testare \u00eenainte de lansare \u0219i revenirea la set\u0103rile planificatorului ar putea duce la alte regresii, iar pe de alt\u0103 parte, utilizatorii ar putea \u00eent\u00e2mpina o sc\u0103dere de dou\u0103 ori a performan\u021bei uneia dintre cele mai populare SGBD-uri.
\n
Sursa: opennet.ro<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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[…]<\/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-167524","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\udd47\u00cen nucleul Linux 7.0 a fost identificat\u0103 o regresie care reduce de dou\u0103 ori performan\u021ba PostgreSQL | ProHoster","description":"Un inginer de la compania Amazon a identificat o regresie specific\u0103 pentru nucleul Linux 7.0, ale c\u0103rui lansare este a\u0219teptat\u0103 pe 13 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