docs: add note about PYTHONMALLOC for accurate jemalloc memory tracking #17709
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Added a note in the documentation suggesting that users may set `PYTHONMALLOC=malloc` when using `jemalloc`. This allows jemalloc to track memory usage more accurately by bypassing Python's internal small-object allocator (`pymalloc`), helping to ensure that cache_autotuning functions as expected. This doc change aims to provide more clarity for users configuring jemalloc with Synapse.
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I tried this setting with Docker Compose. Memory usage did go down, yet became much more erratic. On the following graph, the switching point is around 14h00.
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@daedric7 could you share the version without malloc/jemalloc and your configurations? |
Almost 24h of memory usage before the change.
What other info can i provide ? |
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Are you using |
As far as i was aware, jemalloc2 it's always and use when using Docker. Is this not true ? |
I checked start.py inside my container: Can you please confirm that jemalloc2 is not used by default with docker ? Everything else points to the oposite: |
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No significant changes since 1.117.0rc1. - Add config option `redis.password_path`. ([\#17717](element-hq/synapse#17717)) - Fix a rare bug introduced in v1.29.0 where invalidating a user's access token from a worker could raise an error. ([\#17779](element-hq/synapse#17779)) - In the response to `GET /_matrix/client/versions`, set the `unstable_features` flag for [MSC4140](matrix-org/matrix-spec-proposals#4140) to `false` when server configuration disables support for delayed events. ([\#17780](element-hq/synapse#17780)) - Improve input validation and room membership checks in admin redaction API. ([\#17792](element-hq/synapse#17792)) - Clarify the docstring of `test_forget_when_not_left`. ([\#17628](element-hq/synapse#17628)) - Add documentation note about PYTHONMALLOC for accurate jemalloc memory tracking. Contributed by @hensg. ([\#17709](element-hq/synapse#17709)) - Remove spurious "TODO UPDATE ALL THIS" note in the Debian installation docs. ([\#17749](element-hq/synapse#17749)) - Explain how load balancing works for `federation_sender_instances`. ([\#17776](element-hq/synapse#17776)) - Minor performance increase for large accounts using sliding sync. ([\#17751](element-hq/synapse#17751)) - Increase performance of the notifier when there are many syncing users. ([\#17765](element-hq/synapse#17765), [\#17766](element-hq/synapse#17766)) - Fix performance of streams that don't change often. ([\#17767](element-hq/synapse#17767)) - Improve performance of sliding sync connections that do not ask for any rooms. ([\#17768](element-hq/synapse#17768)) - Reduce overhead of sliding sync E2EE loops. ([\#17771](element-hq/synapse#17771)) - Sliding sync minor performance speed up using new table. ([\#17787](element-hq/synapse#17787)) - Sliding sync minor performance improvement by omitting unchanged data from incremental responses. ([\#17788](element-hq/synapse#17788)) - Speed up sliding sync when there are many active subscriptions. ([\#17789](element-hq/synapse#17789)) - Add missing license headers on new source files. ([\#17799](element-hq/synapse#17799)) * Bump phonenumbers from 8.13.45 to 8.13.46. ([\#17773](element-hq/synapse#17773)) * Bump python-multipart from 0.0.10 to 0.0.12. ([\#17772](element-hq/synapse#17772)) * Bump regex from 1.10.6 to 1.11.0. ([\#17770](element-hq/synapse#17770)) * Bump ruff from 0.6.7 to 0.6.8. ([\#17774](element-hq/synapse#17774))
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Added a note in the documentation suggesting that users may set
PYTHONMALLOC=mallocwhen usingjemalloc. This allows jemalloc to track memory usage more accurately by bypassing Python's internal small-object allocator (pymalloc), helping to ensure thatcache_autotuningfunctions as expected.This doc change aims to provide more clarity for users configuring jemalloc with Synapse.
Based on:
synapse/synapse/metrics/jemalloc.py
Lines 198 to 201 in 4ac7835