*: merge the runtime stats in time to avoid using too many memory

[wshwsh12]

What problem does this PR solve?

Issue Number: close #39413

Now tidb need to record some runtime stats for each executor/cop_task and so on, and merge them after the sql finfished.
If there are many cop tasks, the memory can't gc and hold util the sql finfished. Maybe it cause OOM.

Problem Summary:

When the stats will not updated, merge it to the summary stats.

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• XuHuaiyu
• crazycs520

To complete the pull request process, please ask the reviewers in the list to review by filling /cc @reviewer in the comment.
After your PR has acquired the required number of LGTMs, you can assign this pull request to the committer in the list by filling /assign @committer in the comment to help you merge this pull request.

The full list of commands accepted by this bot can be found here.

Reviewer can indicate their review by submitting an approval review.
Reviewer can cancel approval by submitting a request changes review.

[wshwsh12]

/hold

[wshwsh12]

/run-unit-test

[wshwsh12]

/unhold

[crazycs520]

why use defer here?

[wshwsh12]

Use defer to ensure that the Close()(make sure all goroutines have been exit in some parallel executer) is finished before registering stats.

[hawkingrei]

@wshwsh12

    execdetails_test.go:228: 
        	Error Trace:	/home/jenkins/.tidb/tmp/63a9840cd0739f2c243bb46478607469/sandbox/linux-sandbox/3543/execroot/__main__/bazel-out/k8-fastbuild/bin/util/execdetails/execdetails_test_/execdetails_test.runfiles/__main__/util/execdetails/execdetails_test.go:228
        	Error:      	Not equal: 
        	            	expected: "tiflash_task:{proc max:2ns, min:1ns, avg: 1ns, p80:2ns, p95:2ns, iters:3, tasks:2, threads:2}, tiflash_scan:{dmfile:{total_scanned_packs:1, total_skipped_packs:0, total_scanned_rows:8192, total_skipped_rows:0, total_rough_set_index_load_time: 15ms, total_read_time: 202ms}, total_create_snapshot_time: 40ms}"
        	            	actual  : "tiflash_task:{proc max:2ns, min:1ns, avg: 1ns, p80:2ns, p95:2ns, iters:3, tasks:2, threads:2}"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-tiflash_task:{proc max:2ns, min:1ns, avg: 1ns, p80:2ns, p95:2ns, iters:3, tasks:2, threads:2}, tiflash_scan:{dmfile:{total_scanned_packs:1, total_skipped_packs:0, total_scanned_rows:8192, total_skipped_rows:0, total_rough_set_index_load_time: 15ms, total_read_time: 202ms}, total_create_snapshot_time: 40ms}
        	            	+tiflash_task:{proc max:2ns, min:1ns, avg: 1ns, p80:2ns, p95:2ns, iters:3, tasks:2, threads:2}
        	Test:       	TestCopRuntimeStatsForTiFlash

[wshwsh12]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 35bbb14

[wshwsh12]

/run-check_dev_2

[wshwsh12]

/run-all-tests

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #39462.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #39463.

[ti-chi-bot]

In response to a cherrypick label: new pull request created: #39464.

[sre-bot]

TiDB MergeCI notify

✅ Well Done! New fixed [2] after this pr merged.

CI Name	Result	Duration	Compare with Parent commit
idc-jenkins-ci-tidb/sqllogic-test-2	✅ all 28 tests passed	6 min 13 sec	Fixed
idc-jenkins-ci-tidb/integration-ddl-test	✅ all 6 tests passed	5 min 43 sec	Fixed
idc-jenkins-ci/integration-cdc-test	🟢 all 40 tests passed	19 min	Existing passed
idc-jenkins-ci-tidb/integration-common-test	🟢 all 17 tests passed	17 min	Existing passed
idc-jenkins-ci-tidb/common-test	🟢 all 11 tests passed	10 min	Existing passed
idc-jenkins-ci-tidb/mybatis-test	🟢 all 1 tests passed	6 min 13 sec	Existing passed
idc-jenkins-ci-tidb/tics-test	🟢 all 1 tests passed	6 min 4 sec	Existing passed
idc-jenkins-ci-tidb/sqllogic-test-1	🟢 all 26 tests passed	4 min 33 sec	Existing passed
idc-jenkins-ci-tidb/integration-compatibility-test	🟢 all 1 tests passed	3 min 11 sec	Existing passed
idc-jenkins-ci-tidb/plugin-test	🟢 build success, plugin test success	4min	Existing passed