*: Chunkreuse try reuse chunk in operator #38607
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modified: distsql/select_result.go
modified: executor/adapter.go
modified: executor/admin.go
modified: executor/aggregate.go
modified: executor/builder.go
modified: executor/coprocessor.go
modified: executor/cte.go
modified: executor/delete.go
modified: executor/distsql.go
modified: executor/executor.go
modified: executor/explain.go
modified: executor/index_lookup_hash_join.go
modified: executor/index_lookup_join.go
modified: executor/index_lookup_merge_join.go
modified: executor/index_merge_reader.go
modified: executor/insert_common.go
modified: executor/join.go
modified: executor/joiner.go
modified: executor/merge_join.go
modified: executor/parallel_apply.go
modified: executor/pipelined_window.go
modified: executor/projection.go
modified: executor/select_into.go
modified: executor/show.go
modified: executor/shuffle.go
modified: executor/sort.go
modified: executor/union_scan.go
modified: executor/update.go
modified: executor/window.go
modified: server/conn.go
modified: sessionctx/variable/session.go
modified: sessionctx/variable/sysvar.go
modified: sessionctx/variable/tidb_vars.go
modified: util/chunk/alloc.go
modified: util/chunk/alloc_test.go
modified: util/chunk/chunk.go
…into chunkreuse Conflicts: executor/adapter.go executor/aggregate.go executor/builder.go executor/coprocessor.go executor/distsql.go executor/executor.go executor/join.go executor/projection.go executor/union_scan.go executor/update.go sessionctx/variable/session.go util/chunk/alloc.go modified: executor/executor.go modified: executor/index_lookup_merge_join.go modified: sessionctx/variable/session.go
modified: executor/parallel_apply.go modified: sessionctx/variable/session.go modified: util/chunk/alloc.go modified: util/chunk/chunk.go
modified: executor/admin.go modified: executor/aggregate.go modified: executor/distsql.go modified: executor/executor.go modified: executor/index_lookup_hash_join.go modified: executor/index_lookup_join.go modified: executor/index_lookup_merge_join.go modified: executor/index_merge_reader.go modified: executor/join.go modified: executor/joiner.go modified: executor/pipelined_window.go modified: server/conn.go
modified: sessionctx/variable/sysvar.go modified: sessionctx/variable/tidb_vars.go modified: util/chunk/alloc.go
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@keeplearning20221 Please fix the linter. |
modified: util/chunk/alloc.go modified: util/chunk/chunk.go
modified: util/chunk/chunk.go
modified: sessionctx/variable/tidb_vars.go
modified: executor/index_lookup_merge_join.go modified: util/chunk/alloc_test.go
modified: util/chunk/alloc_test.go
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/run-build |
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/run-build |
modified: sessionctx/variable/session_test.go modified: util/chunk/alloc.go modified: util/chunk/alloc_test.go modified: util/chunk/chunk_test.go
…into chunkreuse
ti-chi-bot
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modified: infoschema/tables_test.go modified: sessionctx/variable/BUILD.bazel modified: testkit/BUILD.bazel modified: tidb-server/BUILD.bazel
cfzjywxk
approved these changes
Nov 3, 2022
ti-chi-bot
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/build-release |
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/release |
We can change to disable by default if we find anything wrong during test. |
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/merge |
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This pull request has been accepted and is ready to merge. Commit hash: 0ceee0d
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/run-build |
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/run-check_dev_2 |
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/run-mysql-test |
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/run-check_dev_2 |
TiDB MergeCI notify✅ Well Done! New fixed [2] after this pr merged.
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What problem does this PR solve?
Issue Number: close #38606
Problem Summary:
Every time chunk is used, it will be applied from the system, which affects the execution efficiency of tidb-server.
What is changed and how it works?
Cache previously applied chunks and columns in alloc.later, it will get chunk from cache first , if not enough then apply from system.
Alloc modified based on the alloc developed by tiancaiamao. It uses slices to manage chunks objects and columns objects. When used, they are taken out of free slices and placed in allocated slices.When the SQL execution is complete, put it back from the allocated slice back to the free slice.
Add configuration items
tidb_enable_reuse_chunk function switch
tidb_max_reuse_chunk Maximum number of cached chunks
tidb_max_reuse_column Maximum number of cached columns
Add read-only variable：
Last_sql_use_alloc Whether the previous sql uses chunk alloc
Check List
Tests
Side effects
Documentation
Release note
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