Ветка: stream-nb-1.put-lwtrack

24-1-mkql-runtime

24.3.14.stream-nb-24-3.fullflash-exp1

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mergelibs-yql

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mute/-ydb/tests/olap/ttl_tiering-data_correctness.py.TestDataCorrectness.test

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mute/ydb/core/blobstorage/ut_vdisk2_VDiskTest.HugeBlobWrite

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mute/ydb/core/mind/hive/ut/THiveTest.DrainWithHiveRestart

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mute/ydb/library/yql/providers/generic/connector/tests/datasource/clickhouse-test.py.test_select_datetime

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mute/ydb/tests/olap/ttl_tiering-ttl_delete_s3.py.TestDeleteS3Ttl.test_data_unchanged_after_ttl_change

mute/ydb/tests/stress/kv/tests-test_workload.py.TestYdbKvWorkload.testcolumn]

mute/yurchuk/kqp

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readme-linkedin-link

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revert-10009-dev/check_thread_in_blockdevice

revert-10337-fix_includes_3

revert-11474-mvcc-snapshot-evwrite

revert-11605-YQL-19292

revert-12084-harmonizer/split_to_files

revert-12824-VIEW.s3_backup.1

revert-3499-main

revert-4919-olap-buffer

revert-4924-fix-joins

revert-5604-memory-free-fix

revert-5852-marat_nurgaleev_moi_drug

revert-6270-stats-24-1/change_as_usage

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revert-6286-add-enable-impl-params-to-table-service-config

revert-7492-drop_old_json

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revert-7994-mergelibs-240819-0942

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revert-8269-patch/24-3/revert-as

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revert-dffc12acf95248fe644c7a64a71abcd5467b4bf8

rightlib

roadmap

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yql-stable-2024-09-03

yql-stable-2024-12-23

yql-stable-test1

yql-temp-table

Maxim Gorbunov fd0b1ac7c0 Generate CMakeLists (#2184)		1 год назад
..
CMakeLists.darwin-arm64.txt	ffff7a34e4 add darwin-arm64 CMakeLists	1 год назад
CMakeLists.darwin-x86_64.txt	d28c55ab25 Intermediate changes	1 год назад
CMakeLists.linux-aarch64.txt	d28c55ab25 Intermediate changes	1 год назад
CMakeLists.linux-x86_64.txt	d28c55ab25 Intermediate changes	1 год назад
CMakeLists.txt	fd0b1ac7c0 Generate CMakeLists (#2184)	1 год назад
CMakeLists.windows-x86_64.txt	d28c55ab25 Intermediate changes	1 год назад
README.md	d28c55ab25 Intermediate changes	1 год назад
stockpile.h	d28c55ab25 Intermediate changes	1 год назад
stockpile_linux.cpp	d28c55ab25 Intermediate changes	1 год назад
stockpile_other.cpp	d28c55ab25 Intermediate changes	1 год назад
ya.make	d28c55ab25 Intermediate changes	1 год назад

stockpile

При приближении к лимиту памяти в memory cgroup, linux запускает механизм direct reclaim, чтобы освободить свободную память. По опыту YT, direct reclaim очень сильно замедляет работу всего процесса.

Проблема возникает не только, когда память занята анонимными страницами. 50% памяти контейнера может быть занято не dirty страницами page cache, но проблема всёравно будет проявляться. Например, если процесс активно читает файлы с диска без O_DIRECT, вся память очень быстро будет забита.

Чтобы бороться с этой проблемой, в яндексовом ядре добавлена ручка madvise(MADV_STOCKPILE). Больше подробностей в https://st.yandex-team.ru/KERNEL-186

README.md

stockpile