From 747c53357fd228b435e981f23e2e720ea24bee9b Mon Sep 17 00:00:00 2001
From: "Robert G. Jakabosky" <bobby@sharedrealm.com>
Date: Thu, 24 Mar 2011 00:34:27 -0700
Subject: [PATCH] Add thread-to-thread latency test example.

---
 perf/thread_lat.lua | 89 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 perf/thread_lat.lua

diff --git a/perf/thread_lat.lua b/perf/thread_lat.lua
new file mode 100644
index 0000000..c307776
--- /dev/null
+++ b/perf/thread_lat.lua
@@ -0,0 +1,89 @@
+-- Copyright (c) 2011 Robert G. Jakabosky <bobby@sharedrealm.com>
+--
+-- Permission is hereby granted, free of charge, to any person obtaining a copy
+-- of this software and associated documentation files (the "Software"), to deal
+-- in the Software without restriction, including without limitation the rights
+-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+-- copies of the Software, and to permit persons to whom the Software is
+-- furnished to do so, subject to the following conditions:
+--
+-- The above copyright notice and this permission notice shall be included in
+-- all copies or substantial portions of the Software.
+--
+-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+-- THE SOFTWARE.
+
+if #arg < 4 then
+    print("usage: lua " .. arg[0] .. " <bind-to> <connect-to> <message-size> <roundtrip-count>")
+    os.exit()
+end
+
+local bind_to = arg[1]
+local connect_to = arg[2]
+local message_size = tonumber(arg[3])
+local roundtrip_count = tonumber(arg[4])
+
+local zmq = require"zmq"
+local thread = require"zmq.thread"
+
+local socket = require"socket"
+local time = socket.gettime
+
+local child_code = [[
+	local connect_to, message_size, roundtrip_count = ...
+	print("child:", ...)
+
+	local zmq = require"zmq"
+	local thread = require"zmq.thread"
+
+	local ctx = thread.get_parent_ctx()
+	local s = ctx:socket(zmq.REP)
+	s:connect(connect_to)
+
+	local msg = zmq.zmq_msg_t()
+
+	for i = 1, roundtrip_count do
+		assert(s:recv_msg(msg))
+		assert(msg:size() == message_size, "Invalid message size")
+		assert(s:send_msg(msg))
+	end
+
+	s:close()
+]]
+
+local ctx = zmq.init(1)
+local s = ctx:socket(zmq.REQ)
+s:bind(bind_to)
+
+local child_thread = thread.runstring(ctx, child_code, connect_to, message_size, roundtrip_count)
+child_thread:start()
+
+local data = ("0"):rep(message_size)
+local msg = zmq.zmq_msg_t.init_size(message_size)
+
+local start_time = time()
+
+for i = 1, roundtrip_count do
+	assert(s:send_msg(msg))
+	assert(s:recv_msg(msg))
+	assert(msg:size() == message_size, "Invalid message size")
+end
+
+local end_time = time()
+
+local elapsed = end_time - start_time
+local latency = elapsed * 1000000 / roundtrip_count / 2
+
+print(string.format("message size: %i [B]", message_size))
+print(string.format("roundtrip count: %i", roundtrip_count))
+print(string.format("mean latency: %.3f [us]", latency))
+
+s:close()
+ctx:term()
+
+