use sync.Pool to reduce gc presure on hot path #5730
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@coocood Here is another example using |
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@zhexuany That's because the |
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@zhexuany |
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We need to discuss this in detail. Could you open a Google Doc and put all the things in it? @zhexuany |
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Here is benchmark result for different workloads. |
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The benchmark results shows that it is not worth to use sync.pool. |
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I will close this PR. please feel free to reopen it if you have different thoughts. |
crazycs520
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Jun 4, 2025
…_pr=95 * executor: fix a bug that global temporary table send cop request (pingcap#588… * statistics: fix the panic when to async load stats with dropped index … * executor: fix prepared protocol charset (pingcap#58872) (pingcap#58931) * *: Update client-go and verify all read ts (pingcap#58909) * integration test: fix test case "br_pitr" (pingcap#58876) * session: add indexes for `mysql.analyze_jobs` (pingcap#58134) (pingcap#58355) * ddl: fix args count for modify column (pingcap#58855) (pingcap#58858) * planner: correct plan when scan tidb related cluster table with KeepOr… * planner: Fix vector not truncated after CBO (pingcap#58809) (pingcap#58844) * ddl: Fix vector index for high dimensional vectors (pingcap#58717) (pingcap#58835) * ddl: Fix issue with concurrent update getting reverted by BackfillData… * statistics: stats cache set default quota as 20% (pingcap#58013) (pingcap#58817) * executor: change the evaluation order of columns in `Update` and `Inse… * statistics: add recover to protect background task (pingcap#58739) (pingcap#58767) * ttl: fix the infinite waiting for delRateLimiter when `tidb_ttl_delete… * ttl: reduce some warnings logs when locking TTL tasks (pingcap#58306) (pingcap#58783) * ttl: retry the rows when del rate limiter returns error in delWorker (… * ttl: reschedule task to other instances when shrinking worker (pingcap#57703) (pingcap#58778) * ttl: fix the issue that one task losing heartbeat will block other tas… * ttl: fix the issue that the task is not cancelled after transfering ow… * ddl: fix job state overridden when concurrent updates don't overlap in… * ttl: set the job history status to `cancelled` if it's removed in GC a… * ttl: fix the timezone issue and panic in the caller of `getSession` (#… * ddl: fix version syncer doesn't print who hasn't synced on partial syn… * ttl: fix the issue that `DROP TABLE` / `ALTER TABLE` will keep job run… * br/stream: allow pitr to create oversized indices (pingcap#58433) (pingcap#58527) * ttl: set a result for timeout scan task during shrinking scan worker (… * executor: fix time zone issue when querying slow log (pingcap#58455) (pingcap#58577) * table: fix the issue that the default value for `BIT` column is wrong … * statistics: temporarily skip handling errors for DDL events (pingcap#58609) (pingcap#58634) * sessionctx: fix null max value to leading wrong warning (pingcap#57898) (pingcap#57935) * planner: convert cartesian semi join with other nulleq condition to cr… * planner: fix idxMergePartPlans forget to deal with RootTaskConds (pingcap#585… * domain: change some stats log level as WARN (pingcap#58316) (pingcap#58555) * planner: quickly get total count from index/column (pingcap#58365) (pingcap#58431) * planner, expr: eval readonly user var during plan phase (pingcap#54462) (pingcap#58540) * metrics: add col/idx name(s) for BackfillProgressGauge and BackfillTot… * br: refactor test to use wait checkpoint method (pingcap#57612) (pingcap#58498) * executor: reuse chunk in hash join v2 during restoring (pingcap#56936) (pingcap#58018) * executor: fix goroutine leak when exceed quota in hash agg (pingcap#58078) (pingcap#58462) * copr: fix the issue that busy threshold may redirect batch copr to fol… * statistics: skip non-exicted table when to init stats (pingcap#58381) (pingcap#58394) * planner: fix incorrectly using the schema for plan cache (pingcap#57964) (pingcap#58090) * *: use DDL subscriber updating stats meta (pingcap#57872) (pingcap#58387) * planner, runtime_filter: Remove redundant logs whose meaning can be di… * statistics: remove dead code (pingcap#58412) (pingcap#58442) * planner: Use/force to apply prefer range scan (pingcap#56928) (pingcap#58444) * statistics: gc the statistics correctly after drop the database (pingcap#5730… * ddl: Fixed partition interval from DayMinute to just Minute. (pingcap#57738) (pingcap#58019) * executor: Enlarge the timeout for fetching TiFlash system tables (pingcap#579…
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Below is the benchmark, I am not sure why the ~~~memory usage does not decrease.~~~ (we just reuse the object. Memory allocation is still original. Using sync.Pool can only reduce gc pressure. )
I am inverstigating this. In additon, I will add different workload benchmark test later.