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Type:
Task
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Resolution: Won't Do
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Priority:
Major - P3
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None
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Affects Version/s: None
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Component/s: None
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Storage Engines
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StorEng - Defined Pipeline
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Not Needed
Create a new API on WT_SESSION that takes a struct of configuration options instead of a config string. Majority of the time in begin_transaction in a read-only workload is spent in config_check and __wt_txn_config. By passing a struct of options, we can eliminate this string parsing time.
On YCSB, there was a ~9% improvement in 100 read. See https://spruce.mongodb.com/version/6466bd2056234346b7ac572e/tasks?sorts=STATUS%3AASC%3BBASE_STATUS%3ADESC
Expect outcome:
A similar improvement in performance of begin_transaction as the POC below:
Baseline:
2023-05-19T10:14:11-04:00 Running build/install/bin/storage_wiredtiger_begin_transaction_block_bm Run on (16 X 3200 MHz CPU s) CPU Caches: L1 Data 32 KiB (x16) L1 Instruction 32 KiB (x16) L2 Unified 256 KiB (x16) L3 Unified 20480 KiB (x2) Load Average: 1.12, 0.50, 0.19 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ BM_WiredTigerBeginTxnBlock 191 ns 191 ns 3491532 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kEnforce, RoundUpPreparedTimestamps::kNoRound> 381 ns 380 ns 1811775 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kEnforce, RoundUpPreparedTimestamps::kRound> 1575 ns 1572 ns 439001 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflicts, RoundUpPreparedTimestamps::kNoRound> 1138 ns 1136 ns 614137 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflicts, RoundUpPreparedTimestamps::kRound> 2782 ns 2777 ns 248564 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflictsAllowWrites, RoundUpPreparedTimestamps::kNoRound> 1119 ns 1116 ns 604495 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflictsAllowWrites, RoundUpPreparedTimestamps::kRound> 2768 ns 2764 ns 251661 BM_setTimestamp 255 ns 255 ns 2648494
Begin_transaction with Struct:
2023-05-19T10:12:03-04:00 Running build/install/bin/storage_wiredtiger_begin_transaction_block_bm Run on (16 X 3200 MHz CPU s) CPU Caches: L1 Data 32 KiB (x16) L1 Instruction 32 KiB (x16) L2 Unified 256 KiB (x16) L3 Unified 20480 KiB (x2) Load Average: 1.50, 0.33, 0.10 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ Benchmark Time CPU Iterations ------------------------------------------------------------------------------------------------------------------------------------------------------------------------ BM_WiredTigerBeginTxnBlock 203 ns 202 ns 3449411 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kEnforce, RoundUpPreparedTimestamps::kNoRound> 151 ns 150 ns 4170429 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kEnforce, RoundUpPreparedTimestamps::kRound> 166 ns 165 ns 4219049 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflicts, RoundUpPreparedTimestamps::kNoRound> 166 ns 166 ns 4239556 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflicts, RoundUpPreparedTimestamps::kRound> 157 ns 157 ns 4175509 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflictsAllowWrites, RoundUpPreparedTimestamps::kNoRound> 167 ns 167 ns 4150116 BM_WiredTigerBeginTxnBlockWithArgs<PrepareConflictBehavior::kIgnoreConflictsAllowWrites, RoundUpPreparedTimestamps::kRound> 166 ns 166 ns 4159999 BM_setTimestamp 274 ns 273 ns 2612318
* The reproducing steps, and
- Links to other relevant tickets/resources.
POC:
https://github.com/mongodb/mongo/compare/master...markbenvenuto:mongo:begin_txn_fast?expand=1
YCSB Per analysis
- is depended on by
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- Closed
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- related to
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WT-11126 Add configuration compilation to speed up WT_SESSION::begin_transaction
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- Closed
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