97 mbps !!! super fast

dosen't flush every message, pulls batches from the queue to send, and flushes at the end of each batch.
batches are a min of 1 message, but may be more.

src/server/client.zig

@@ -25,7 +25,7 @@ pub fn init(
 
 pub fn start(self: *Client, io: std.Io, alloc: std.mem.Allocator, queue: *std.Io.Queue(Message)) !void {
     self.recv_queue = queue;
-    var msgs: [16]Message = undefined;
+    var msgs: [8]Message = undefined;
     while (true) {
         const len = try queue.get(io, &msgs, 1);
         std.debug.assert(len <= msgs.len);
@@ -49,6 +49,7 @@ pub fn start(self: *Client, io: std.Io, alloc: std.mem.Allocator, queue: *std.Io
                 },
             }
         }
+        try self.to_client.flush();
     }
 }
 
@@ -68,19 +69,20 @@ pub fn next(self: *Client, allocator: std.mem.Allocator) !Message {
 
 fn writeOk(out: *std.Io.Writer) !void {
     _ = try out.write("+OK\r\n");
-    try out.flush();
+}
+
+fn writeErr(out: *std.Io.Writer, msg: []const u8) !void {
+    _ = try out.print("-ERR '{s}'\r\n", .{msg});
 }
 
 fn writePong(out: *std.Io.Writer) !void {
     _ = try out.write("PONG\r\n");
-    try out.flush();
 }
 
 pub fn writeInfo(out: *std.Io.Writer, info: Message.ServerInfo) !void {
     _ = try out.write("INFO ");
     try std.json.Stringify.value(info, .{}, out);
     _ = try out.write("\r\n");
-    try out.flush();
 }
 
 fn writeMsg(out: *std.Io.Writer, msg: Message.Msg) !void {
@@ -94,7 +96,6 @@ fn writeMsg(out: *std.Io.Writer, msg: Message.Msg) !void {
             msg.payload,
         },
     );
-    try out.flush();
 }
 
 test {

src/server/main.zig

@@ -126,12 +126,12 @@ fn handleConnection(
     const allocator = if (builtin.mode == .Debug or builtin.mode == .ReleaseSafe) client_allocator.allocator() else server_allocator;
 
     // Set up client writer
-    var w_buffer: [256]u8 = undefined;
+    var w_buffer: [1024]u8 = undefined;
     var writer = stream.writer(io, &w_buffer);
     const out = &writer.interface;
 
     // Set up client reader
-    var r_buffer: [256]u8 = undefined;
+    var r_buffer: [1024]u8 = undefined;
     var reader = stream.reader(io, &r_buffer);
     const in = &reader.interface;
 
@@ -140,8 +140,9 @@ fn handleConnection(
     try server.addClient(server_allocator, id, &client);
     defer server.removeClient(io, server_allocator, id);
 
-    var qbuf: [16]Message = undefined;
+    var qbuf: [8]Message = undefined;
     var queue: std.Io.Queue(Message) = .init(&qbuf);
+    defer queue.close(io);
 
     var client_task = try io.concurrent(Client.start, .{ &client, io, server_allocator, &queue });
     defer client_task.cancel(io) catch {};