Scale pool size with number of cores since Redis connections are cheap

options.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net"
 	"net/url"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
@@ -54,7 +55,7 @@ type Options struct {
 	WriteTimeout time.Duration
 
 	// Maximum number of socket connections.
-	// Default is 10 connections.
+	// Default is 10 connections per every CPU as reported by runtime.NumCPU.
 	PoolSize int
 	// Amount of time client waits for connection if all connections
 	// are busy before returning an error.
@@ -91,7 +92,7 @@ func (opt *Options) init() {
 		}
 	}
 	if opt.PoolSize == 0 {
-		opt.PoolSize = 10
+		opt.PoolSize = 10 * runtime.NumCPU()
 	}
 	if opt.DialTimeout == 0 {
 		opt.DialTimeout = 5 * time.Second