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2.5 KiB
2.5 KiB
slug |
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/en/operations/system-tables/jemalloc_bins |
jemalloc_bins
Contains information about memory allocations done via jemalloc allocator in different size classes (bins) aggregated from all arenas. These statistics might not be absolutely accurate because of thread local caching in jemalloc.
Columns:
index
(UInt64) — Index of the bin ordered by sizelarge
(Bool) — True for large allocations and False for smallsize
(UInt64) — Size of allocations in this binallocations
(UInt64) — Number of allocationsdeallocations
(UInt64) — Number of deallocations
Example
Find the sizes of allocations that contributed the most to the current overall memory usage.
SELECT
*,
allocations - deallocations AS active_allocations,
size * active_allocations AS allocated_bytes
FROM system.jemalloc_bins
WHERE allocated_bytes > 0
ORDER BY allocated_bytes DESC
LIMIT 10
┌─index─┬─large─┬─────size─┬─allocactions─┬─deallocations─┬─active_allocations─┬─allocated_bytes─┐
│ 82 │ 1 │ 50331648 │ 1 │ 0 │ 1 │ 50331648 │
│ 10 │ 0 │ 192 │ 512336 │ 370710 │ 141626 │ 27192192 │
│ 69 │ 1 │ 5242880 │ 6 │ 2 │ 4 │ 20971520 │
│ 3 │ 0 │ 48 │ 16938224 │ 16559484 │ 378740 │ 18179520 │
│ 28 │ 0 │ 4096 │ 122924 │ 119142 │ 3782 │ 15491072 │
│ 61 │ 1 │ 1310720 │ 44569 │ 44558 │ 11 │ 14417920 │
│ 39 │ 1 │ 28672 │ 1285 │ 913 │ 372 │ 10665984 │
│ 4 │ 0 │ 64 │ 2837225 │ 2680568 │ 156657 │ 10026048 │
│ 6 │ 0 │ 96 │ 2617803 │ 2531435 │ 86368 │ 8291328 │
│ 36 │ 1 │ 16384 │ 22431 │ 21970 │ 461 │ 7553024 │
└───────┴───────┴──────────┴──────────────┴───────────────┴────────────────────┴─────────────────┘