fix: improve command execution speed

Command execution speed gets a significant speed boost by avoiding multiple small writes to the socket connection. Using an IOBuffer to collect the command args and do a single socket write.
Also turned off nagle and turned on quickack on sockets, suitable for the typically short and quick exchanges needed here.

Author: tanmaykm

src/connection.jl

@@ -101,6 +101,10 @@ function SubscriptionConnection(parent::SubscribableConnection)
 end
 
 function on_connect(conn::RedisConnectionBase)
+    # disable nagle and enable quickack to speed up the usually small exchanges
+    Sockets.nagle(conn.socket, false)
+    Sockets.quickack(conn.socket, true)
+    
     conn.password != "" && auth(conn, conn.password)
     conn.db != 0        && select(conn, conn.db)
     conn

src/parser.jl

@@ -88,8 +88,10 @@ end
 
 function execute_command_without_reply(conn::RedisConnectionBase, command)
     is_connected(conn) || throw(ConnectionException("Socket is disconnected"))
-    lock(conn.socket.lock) do 
-        pack_command(conn.socket, command)
+    iob = IOBuffer()
+    pack_command(iob, command)
+    lock(conn.socket.lock) do
+        write(conn.socket, take!(iob))
     end
 end