pg_shmem_allocations_numa
The pg_shmem_allocations_numa shows how shared memory allocations in the server's main shared memory segment are distributed across NUMA nodes. This includes both memory allocated by PostgreSQL itself and memory allocated by extensions using the mechanisms detailed in Section 36.10.11. This view will output multiple rows for each of the shared memory segments provided that they are spread across multiple NUMA nodes. This view should not be queried by monitoring systems as it is very slow and may end up allocating shared memory in case it was not used earlier. Current limitation for this view is that won't show anonymous shared memory allocations. Note that this view does not include memory allocated using the dynamic shared memory infrastructure.
English manual coverage begins with PostgreSQL 7.4. Source history and runtime observations have their own recorded version boundaries.
Reading PG 18·Select a recorded version
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Definition PG 18
The pg_shmem_allocations_numa shows how shared memory allocations in the server's main shared memory segment are distributed across NUMA nodes. This includes both memory allocated by PostgreSQL itself and memory allocated by extensions using the mechanisms detailed in Section 36.10.11. This view will output multiple rows for each of the shared memory segments provided that they are spread across multiple NUMA nodes. This view should not be queried by monitoring systems as it is very slow and may end up allocating shared memory in case it was not used earlier. Current limitation for this view is that won't show anonymous shared memory allocations. Note that this view does not include memory allocated using the dynamic shared memory infrastructure.
Catalog columns
| Column | Type | Nullability | Description |
|---|---|---|---|
| name | text | Nullable | The name of the shared memory allocation. |
| numa_node | int4 | Nullable | ID of NUMA node |
| size | int8 | Nullable | Size of the allocation on this particular NUMA memory node in bytes |
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Definition sources
center · PostgreSQL 18 · catalog-bilingual-repair:ff53ca2198544e03e0217f3551bac0b17d9689c802469e9d8225e6ce431448d5
Text language: en · catalog-bilingual-repair:ff53ca2198544e03e0217f3551bac0b17d9689c802469e9d8225e6ce431448d5