postgresql.conf huge_pages=onshared_buffers=2GB# 使用2G内存,这个值需要小于总共大页面内存量 注意 如果postgresql.conf配置huge_pages=on时,且shared_buffers值等于huge_page总内存量(hugepagesz*hugepages)时,数据库无法启动,报如下错误: Thiserrorusually means that PostgreSQL's request for a shared memory se...
在测试环境中是手动用docker部署的postgres(简称:pg),采用默认的配置pg运行正常,在将pg转移到k8s中之后,发现由于k8s集群节点中有节点有hugepages-2Mi的资源配置,因此pg默认会开启hugepage,但是我的部署yaml文件中并没有给pg分配hugepage的资源,从而导致pg运行失败。
在PostgreSQL使用大量 连续内存块时利用大页面来降低开销。要在 PostgreSQL中启用这个 特性,你需要一个 CONFIG_HUGETLBFS=y并且 CONFIG_HUGETLB_PAGE=y的内核。 你也还必须调节系统设置 vm.nr_hugepages。要估计所需的 大页面的数量,关闭大页面启动 PostgreSQL并且从 proc 文件系统检查VmPeak值: $ head -1 /path/...
Tuning huge pages in Postgres25 May, 2023 In E69 of “5mins of Postgres” we're going to talk about tuning huge pages in Postgres. We’ll explain what the Translation Lookaside Buffer is and how, starting with Postgres 15, Postgres can help you calculate how many huge pages to allocate...
2.1 Huge pages 原理 在虚拟内存管理中,内核维护一个将虚拟内存地址映射到物理地址的表,对于每个页面操作,内核都需要加载相关的映射。如果你的内存页很小,那么你需要加载的页就会很多,导致内核会加载更多的映射表。而这会降低性能。 使用“大内存页”,意味着所需要的页变少了。从而大大减少由内核加载的映射表的数...
优化PostgreSQL数据库配置是一个复杂的过程,涉及多个方面的调整和优化。以下是一些关键的优化步骤和建议: 操作系统配置优化 内核参数优化:调整如kernel.shmmax、kernel.shmall、vm.nr_hugepages等参数,以优化内存管理。 系统限制优化:通过修改/etc/security/limits.conf文件,调整文件描述符和进程数等限制,以支持更多并发...
huge_pages: try shared_buffers: 512MB work_mem: 128MB maintenance_work_mem: 256MB effective_cache_size: 4GB checkpoint_timeout: 15min checkpoint_completion_target: 0.9 min_wal_size: 2GB max_wal_size: 4GB wal_buffers: 32MB default_statistics_target: 1000 seq_page_cost: 1 random_page_cost...
postgresql: parameters: huge_pages: "off" bootstrap: initdb: options: ['--set', 'huge_pages=off'] get the following error initdb {"level":"info","ts":"2025-02-06T09:34:29.277151713Z","msg":"Creating new data directory","logging_pod":"immich-postgres-1-initdb","pgdata":"/var/...
Note the huge size differences among the indexes! SELECT pg_size_pretty(pg_relation_size('test')) AS table_size, pg_size_pretty(pg_relation_size('btree_random_x')) AS btree_random_size, pg_size_pretty(pg_relation_size('brin_random_x')) AS brin_random_size, pg_size_pretty(pg_relati...
In a recent post about measuring thememory overhead of a Postgres connectionI show that it is surprisingly hard to accurately measure the memory overhead. And that in many workloads, and with the right configuration—most importantly, usinghuge_pages—the memory overhead o...