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tidb-config-file.md: add description for txn-local-latches #776

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tidb-config-file.md: add description for txn-local-latches
AndreMouche Jun 21, 2018
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address comments
AndreMouche Jun 25, 2018
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tidb-config: update txn-local-latches
AndreMouche Jun 28, 2018
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14 changes: 13 additions & 1 deletion op-guide/tidb-config-file.md
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Expand Up @@ -220,4 +220,16 @@ prepare 语句的 Plan cache 设置。

+ 执行事务提交时，最大的超时时间。
+ 默认: 41s
+ 这个值必须是大于两倍 Raft 选举的超时时间。
+ 这个值必须是大于两倍 Raft 选举的超时时间。

## txn-local-latches

事务内存锁相关配置，当本地事务冲突比较多时建议开启。

### `enable`
+ 开启
+ 默认: false

### `capacity`
+ Hash 对应的 slot 数, 会自动向上调整为 2 的指数倍。每个 slot 占 32 Bytes 内存。当写入数据的范围比较广时（如导数据），设置过小会导致变慢，性能下降。
+ 默认：1024000