Safe Haskell	None
Language	GHC2024

Arbiter.Core.PoolConfig

Description

Connection pool configuration.

Synopsis

data PoolConfig = PoolConfig {
- poolSize :: Int
- poolIdleTimeout :: Int
- poolStripes :: Maybe Int
}
defaultPoolConfig :: PoolConfig
poolConfigForWorkers :: Int -> PoolConfig

Documentation

data PoolConfig Source #

Connection pool configuration.

Constructors

PoolConfig
Fields poolSize :: Int Maximum connections poolIdleTimeout :: Int Idle timeout (seconds) poolStripes :: Maybe Int Number of stripes (sub-pools). Reduces lock contention on connection checkout. `Nothing`: Auto-detect based on CPU count `Just n`: Use n stripes

Instances

Instances details

Show PoolConfig Source #
Instance details Defined in Arbiter.Core.PoolConfig Methods showsPrec :: Int -> PoolConfig -> ShowS # show :: PoolConfig -> String # showList :: [PoolConfig] -> ShowS #
Eq PoolConfig Source #
Instance details Defined in Arbiter.Core.PoolConfig Methods (==) :: PoolConfig -> PoolConfig -> Bool # (/=) :: PoolConfig -> PoolConfig -> Bool #

defaultPoolConfig :: PoolConfig Source #

10 connections, 300s idle timeout, 1 stripe. For workers, use poolConfigForWorkers.

poolConfigForWorkers :: Int -> PoolConfig Source #

Pool sized for a worker pool of workerCnt threads.

Returns a single-stripe pool with 2 * workerCnt connections (floor of 2).

A single stripe is intentional. Data.Pool.withResource pins each thread to one stripe based on its capability and does not search other stripes when its own is exhausted. With multiple stripes, threads from the same worker pool can cluster on one stripe and starve it of free connections even when other stripes are idle.