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Having used microsecond tracing to dissect a simple client and server, we are going to need a better system for comparing the subsequent server designs that we explore. Not only do we lack the space to print and analyze increasingly dense and convoluted timestamp traces, but that approach would make it very difficult to step back and to ask, Which of these server designs is working the best We are therefore going to turn now to a public tool: the FunkLoad tool, written in Python and available from the Python Package Index. You can install it in a virtual environment (see 1) with a simple command: $ pip install funkload There are other popular benchmark tools available on the Web, including the Apache bench program named ab, but for this book it seemed that the leading Python load tester would be a good choice. FunkLoad can take a test routine and run more and more copies of it simultaneously to test how the resources it needs struggle with the rising load. Our test routine will be an expanded version of the simple client that we used earlier: it will ask ten questions of the server instead of three, so that the network conversation itself will take up more time relative to the TCP setup and teardown times that come at the beginning and end. Listing 7 5 shows our test routine, embedded in a standard unittest script that we can also run on its own.
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CHAPTER 7 SERVER ARCHITECTURE
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Listing 7 5. Test Routine Prepared for Use with FunkLoad #!/usr/bin/env python # Foundations of Python Network Programming - 7 - launcelot_tests.py # Test suite that can be run against the Launcelot servers. from funkload.FunkLoadTestCase import FunkLoadTestCase import socket, os, unittest, launcelot SERVER_HOST = os.environ.get('LAUNCELOT_SERVER', 'localhost') class TestLauncelot(FunkLoadTestCase): def test_dialog(self): sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.connect((SERVER_HOST, launcelot.PORT)) for i in range(10): question, answer = launcelot.qa[i % len(launcelot.qa)] sock.sendall(question) reply = launcelot.recv_until(sock, '.') self.assertEqual(reply, answer) sock.close() if __name__ == '__main__': unittest.main() The IP address to which the test client connects defaults to localhost but can be adjusted by setting a LAUNCELOT_SERVER environment variable (since I cannot see any way to pass actual arguments through to tests with FunkLoad command-line arguments). Because FunkLoad itself, like other load-testing tools, can consume noticeable CPU, it is always best to run it on another machine so that its own activity does not slow down the server under test. Here, I will use my laptop to run the various server programs that we consider, and will run FunkLoad over on the same desktop machine that I used earlier for building my SSH tunnel. This time there will be no tunnel involved; FunkLoad will hit the server directly over raw sockets, with no other pieces of software standing in the way. So here on my laptop, I run the server, giving it a blank interface name so that it will accept connections on any network interface: $ python server_simple.py '' And on the other machine, I create a small FunkLoad configuration file, shown in Listing 7 6, that arranges a rather aggressive test with an increasing number of test users all trying to make repeated connections to the server at once where a user simply runs, over and over again, the test case that you name on the command line. Read the FunkLoad documentation for an explanation, accompanied by nice ASCII-art diagrams, of what the various parameters mean. Listing 7 6. Example FunkLoad Configuration # TestLauncelot.conf [main] title=Load Test For 7 description=From the Foundations of Python Network Programming url=http://localhost:1060/ [ftest] log_path = ftest.log
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CHAPTER 7 SERVER ARCHITECTURE
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result_path = ftest.xml sleep_time_min = 0 sleep_time_max = 0 [bench] log_to = file log_path = bench.log result_path = bench.xml cycles = 1:2:3:5:7:10:13:16:20 duration = 8 startup_delay = 0.1 sleep_time = 0.01 cycle_time = 10 sleep_time_min = 0 sleep_time_max = 0 Note that FunkLoad finds the configuration file name by taking the class name of the test case which in this case is TestLauncelot and adding .conf to the end. If you re-name the test, or create more tests, then remember to create corresponding configuration files with those class names. Once the test and configuration file are in place, the benchmark can be run. I will first set the environment variable that will alert the test suite to the fact that I want it connecting to another machine. Then, as a sanity check, I will run the test client once as a normal test to make sure that it succeeds: $ export LAUNCELOT_SERVER=192.168.5.130 $ fl-run-test launcelot_tests.py TestLauncelot.test_dialog . ---------------------------------------------------------------------Ran 1 test in 0.228s OK You can see that FunkLoad simply expects us to specify the Python file containing the test, and then specify the test suite class name and the test method separated by a period. The same parameters are used when running a benchmark: $ fl-run-bench launcelot_tests.py TestLauncelot.test_dialog The result will be a bench.xml file full of XML (well, nobody s perfect) where FunkLoad stores the metrics generated during the test, and from which you can generate an attractive HTML report: $ fl-build-report --html bench.xml Had we been testing a web service, the report would contain several different analyses, since FunkLoad would be aware of how many web pages each iteration of the test had downloaded. But since we are not using any of the web-specific test methods that FunkLoad provides, it cannot see inside our code and determine that we are running ten separate requests inside every connection. Instead, it can simply count how many times each test runs per second; the result is shown in Figure 7 1.
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