[MCOL-2198] Investigate a reason behind default for RowAggrThreads setting Created: 2019-02-26  Updated: 2022-08-13  Resolved: 2022-08-13

Status: Closed
Project: MariaDB ColumnStore
Component/s: ExeMgr, PrimProc
Affects Version/s: 1.1.7, 1.2.2
Fix Version/s: Icebox

Type: Bug Priority: Major
Reporter: Roman Assignee: Roman
Resolution: Fixed Votes: 0
Labels: None


 Description   

The current default RowAggrThreads is 4 and this setting effectively limits number of threads used for HASH aggregation.
We should change the default to actual number of cores available or find the reason behind the current default value.

 Comments   
Comment by Roman [ 2022-08-13 ]

This setting controls an amount of parallel threads used for Aggregation operation and there is no reason to have it so small. Its default is now depends on a number of core threads that CPUs have in the system.

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