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tiflash: Clarified profiles.default.max_memory_usage_for_all_queries and fix typo (#20503) #20513

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ti-chi-bot merged 4 commits into from
Jun 13, 2025
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tiflash: Clarified profiles.default.max_memory_usage_for_all_queries and fix typo (#20503) #20513

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cdf9560
Update tiflash-configuration.md
JaySon-Huang Jun 13, 2025
8dc8b61
Fix max_memory_usage_for_all_queries
JaySon-Huang Jun 13, 2025
d1617c1
Apply suggestions from code review
Oreoxmt Jun 13, 2025
7e17ca0
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Oreoxmt Jun 13, 2025
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8 changes: 4 additions & 4 deletions tiflash/tiflash-configuration.md
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Expand Up @@ -361,7 +361,7 @@ I/O 限流功能相关配置。

##### `max_threads`

- `max_threads` 指的是执行一个 MMP Task 的内部线程并发度。当值为 `0` 时，TiFlash 执行 MMP Task 的线程并发度为 CPU 逻辑核数。
- `max_threads` 指的是执行一个 MPP Task 的内部线程并发度。当值为 `0` 时，TiFlash 执行 MPP Task 的线程并发度为 CPU 逻辑核数。
- 该参数只有在系统变量 [`tidb_max_tiflash_threads`](/system-variables.md#tidb_max_tiflash_threads-从-v610-版本开始引入) 设置为 `-1` 时才会生效。
- 默认值：`0`

Expand All @@ -377,9 +377,9 @@ I/O 限流功能相关配置。

- 所有查询过程中，节点对中间数据的内存限制。
- 设置为整数时，单位为 byte，比如 `34359738368` 表示 32 GiB 的内存限制，`0` 表示无限制。
- 设置为 `[0.0, 1.0)` 之间的浮点数时，指节点总内存的比值，比如 `0.8` 表示总内存的 80%，`0.0` 表示无限制。
- 当查询试图申请超过限制的内存时，查询终止执行并且报错
- 默认值：`0.8`，表示总内存的 80%
- 从 v6.6.0 开始，支持设置为 `[0.0, 1.0)` 之间的浮点数，表示节点总内存的比值。例如 `0.8` 表示总内存的 80%，`0.0` 表示无限制。
- 当查询试图申请超过限制的内存时，查询终止执行并且报错。
- 默认值：`0.8`，表示总内存的 80%。在 v6.6.0 之前，默认值为 `0`，表示不限制。

##### `cop_pool_size` <span class="version-mark">从 v5.0 版本开始引入</span>

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