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Add some explanation for tiflash tuning performance doc #15496

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Nov 24, 2023
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Add some explanation for tiflash tuning performance doc #15496

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Add some explanation
yibin87 Nov 24, 2023
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Update tiflash/tune-tiflash-performance.md
yibin87 Nov 24, 2023
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Update tiflash/tune-tiflash-performance.md
yibin87 Nov 24, 2023
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2 changes: 1 addition & 1 deletion tiflash/tune-tiflash-performance.md
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Expand Up @@ -304,7 +304,7 @@ mysql> explain analyze select max(l_shipdate), max(l_commitdate), max(l_receiptd
set @@tidb_max_tiflash_threads = 20;
```

在以下示例中，`tidb_max_tiflash_threads` 设置前，所有 TiFlash 的算子的执行线程数为 24。`tidb_max_tiflash_threads` 设置后，所有 TiFlash 的算子的执行线程数为 60。
在以下示例中，设置 `tidb_max_tiflash_threads` 前，单个 TiFlash 实例的 request 执行的并发度为 8 个线程。该集群一共有 3 个 TiFlash 实例，因此所有 TiFlash 实例上的 request 执行的线程总数是 24。当将 `tidb_max_tiflash_threads` 设置为 `20` 后，所有 TiFlash 实例上的 request 执行的线程总数是 60。

`tidb_max_tiflash_threads` 设置前：

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