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Add system.jemalloc_stats and visualization of jemalloc stats#97077

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antonio2368 merged 6 commits intomasterfrom
jemalloc-stats
Feb 19, 2026
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Add system.jemalloc_stats and visualization of jemalloc stats#97077
antonio2368 merged 6 commits intomasterfrom
jemalloc-stats

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@antonio2368 antonio2368 commented Feb 16, 2026 •
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Changelog category (leave one):

  • Improvement

Changelog entry (a user-readable short description of the changes that goes into CHANGELOG.md):

Add system.jemalloc_stats table exposing jemalloc memory allocator statistics (via malloc_stats_print) for diagnosing memory usage on servers built with jemalloc. Also add a /jemalloc.html HTTP endpoint on the ClickHouse HTTP interface for interactive visualization of these statistics.

Documentation entry for user-facing changes

  • Documentation is written (mandatory for new features)

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clickhouse-gh bot commented Feb 16, 2026 •
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Workflow [PR], commit [70f0941]

Summary: ❌

job_name test_name status info comment
Stress test (arm_asan) failure
Logical error: '(isConst() || isSparse() || isReplicated()) ? getDataType() == rhs.getDataType() : typeid(*this) == typeid(rhs)' (STID: 2508-3698) FAIL cidb
Stress test (arm_asan, s3) failure
Logical error: '(isConst() || isSparse() || isReplicated()) ? getDataType() == rhs.getDataType() : typeid(*this) == typeid(rhs)' (STID: 2508-3698) FAIL cidb

@clickhouse-gh clickhouse-gh bot added the pr-improvement Pull request with some product improvements label Feb 16, 2026
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nickitat commented Feb 16, 2026

Do you have a demo?)

@antonio2368 antonio2368 mentioned this pull request Feb 18, 2026
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antonio2368 commented Feb 18, 2026

@nickitat There will be demo once it reaches its final form 😄

azat
azat approved these changes Feb 19, 2026
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Very nice feature🚀

I did not look at web UI code, but tested it locally, few comments:

  • it will be nice to have ability to sort Bins/Large Allocations/Extents on the Allocations tab
  • Same for Arenas tab

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antonio2368 commented Feb 19, 2026

I did not look at web UI code

It is a Claude generated code, so maybe I should've said to just test it.
Let me merge this for now, and we can improve UI in next PR where I will add flamegraphs.

@antonio2368 antonio2368 added this pull request to the merge queue Feb 19, 2026
Merged via the queue into master with commit f2f904a Feb 19, 2026
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@antonio2368 antonio2368 deleted the jemalloc-stats branch February 19, 2026 14:42
@robot-ch-test-poll3 robot-ch-test-poll3 added the pr-synced-to-cloud The PR is synced to the cloud repo label Feb 19, 2026
@murphy-4o murphy-4o mentioned this pull request Mar 24, 2026
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