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FAQ

What do all these dots mean ?

During a bench cycle each “Starting threads” dot represents a running thread:

Cycle #1 with 10 virtual users
------------------------------

* setUpCycle hook: ... done.
* Current time: 2011-01-26T23:23:06.234422
* Starting threads: ........

During the cycle logging each green dot represents a successful test while each red ‘F’ represents a test failure:

* Logging for 10s (until 2011-01-26T23:23:16.360602): ......F......

During the tear-down each dot represents a stopped thread:

* Waiting end of threads: .........

How can I accept invalid Cookies ?

  • Error : COOKIE ERROR: Cookie domain "<DOMAINE>" doesn’t start with "."

    Comment the lines in file /usr/lib/python2.6/site-packages/webunit-1.3.8-py2.6.egg/webunit/cookie.py:

    #if domain[0] != '.':
    #  raise Error, 'Cookie domain "%s" doesn\'t start with "."' % domain
    
  • Error : COOKIE ERROR: Cookie domain "."<DOMAINE>" doesn’t match request host "<DOMAINE>"

    Comment the lines in the file /usr/lib/python2.6/site-packages/webunit-1.3.8-py2.6.egg/webunit/cookie.py:

    #if not server.endswith(domain):
    #  raise Error, 'Cookie domain "%s" doesn\'t match '
    #  'request host "%s"'%(domain, server)
    

How can I share a counter between concurrent users ?

The credential server can serve a sequence. Using xmlrpc_get_seq threads can share a sequence:

from funkload.utils import xmlrpc_get_seq
...
seq = xmlrpc_get_seq()

How can I set a timeout on request ?

FunkLoad uses (a patched) webunit, which uses httplib for the actual requests. It does not explicitly set a timeout, so httplib uses the global default from socket. By default, the global default is None, meaning “wait forever”. Setting it to a value will cause HTTP requests made by FunkLoad to time out if the server does not respond in time.

import socket
socket.setdefaulttimeout(SECONDS)

where SECONDS is, of course, your preferred timeout in seconds.

How can I submit high load ?

High load works fine for IO Bound tests, not on CPU bound tests. The test script must be light:

  • When possible don’t parse HTML/xml pages, use string find methods or regular expressions - they are much much faster than any HTML parsing including getDOM and BeautifulSoup. If you start emulating a browser, you will be as slow as a browser.
  • Always use the --simple-fetch option to prevent parsing HTML pages and retrieving resources.
  • Try to generate or prepare the data before the test to minimize the processing during the test.

On 32-bit Operating Systems, install psyco, it gives a 50% boost (aptitude install python-psyco on Debian/Ubuntu OS).

On multi-CPU servers, the Python GIL is getting infamous. To maximize FunkLoad’s CPU usage, you need to set the CPU affinity. taskset -c 0 fl-run-bench is always faster than fl-run-bench. Using one bench runner process per CPU is a work around to use the full server power.

Use multiple machines to perform the load test, see the next section.

How can I run multiple benchers ?

Bench result files can be merged by the fl-build-report command, but how do you run multiple benchers?

There are many ways:

  • Use the new “distribute” mode (still in beta), it requires paramiko and virtualenv:

    sudo aptitude install python-paramiko, python-virtualenv

    It adds 2 new command line options:

    • --distribute: to enable distributed mode
    • --distribute-workers=uname@host,uname:pwd@host...: user:password can be skipped if using pub-key.

    For instance to use 2 workers you can do something like this:

    $ fl-run-bench -c 1:2:3 -D 5 -f --simple-fetch  test_Simple.py Simple.test_simple --distribute --distribute-workers=node1,node2 -u http://target/
    ========================================================================
    Benching Simple.test_simple
    ========================================================================
    Access 20 times the main url
    ------------------------------------------------------------------------
    
    Configuration
    =============
    
    * Current time: 2011-02-13T23:15:15.174148
    * Configuration file: /tmp/funkload-demo/simple/Simple.conf
    * Distributed output: log-distributed
    * Server: http://node0/
    * Cycles: [1, 2, 3]
    * Cycle duration: 5s
    * Sleeptime between request: from 0.0s to 0.0s
    * Sleeptime between test case: 0.0s
    * Startup delay between thread: 0.01s
    * Channel timeout: None
    * Workers :octopussy,simplet
    
    * Preparing sandboxes for 2 workers.....
    * Starting 2 workers..
    
    * [node1] returned
    * [node2] returned
    * Received bench log from [node1] into log-distributed/node1-simple-bench.xml
    * Received bench log from [node2] into log-distributed/node2-simple-bench.xml
    
    # Now building the report
    $ fl-build-report --html log-distributed/node1-simple-bench.xml  log-distributed/node2-simple-bench.xml
    Merging results files: ..
    nodes: node1, node2
    cycles for a node:    [1, 2, 3]
    cycles for all nodes: [2, 4, 6]
    Results merged in tmp file: /tmp/fl-mrg-o0MI8L.xml
    Creating html report: ...done:
    /tmp/funkload-demo/simple/test_simple-20110213T231543/index.html

    Note that the version of FunkLoad installed on nodes is defined in the configuration file:

    [distribute]
    log_path = log-distributed
    funkload_location=http://pypi.python.org/packages/source/f/funkload/funkload-1.16.1.tar.gz

    You can have multiple benchers per server by defining many workers with the same hostname in your configuration file. Add a workers section to your configuration file:

    [workers]
    hosts = host1cpu1 host1cpu2 host2cpu1 host2cpu2

    And then define these workers:

    [host1cpu1]
    host = host1
    username = user
    password = password
    
    [host1cpu2]
    host = host1
    username = user
    password = password
    
    [host2cpu1]
    host = host2
    username = user
    password = password
    
    [host2cpu2]
    host = host2
    username = user
    password = password
    

    When defining workers in the conf file you can alternatively specify a path to a private key file instead of writing your passwords in cleartext:

    [worker1]
    host = worker1
    username = user
    ssh_key = /path/to/my_key_name.private.key

    Then run adding just the –distribute option:

    $ fl-run-bench -c 1:2:3 -D 5 -f --simple-fetch  test_Simple.py Simple.test_simple --distribute -u http://target/

    If your node uses a non standard ssh port (for instance, if you are using ssh tunneling) you can use:

    [host1]
    host = host1:port

    By default, the timeout on the ssh channel with the workers is set to None (ie timeouts are disabled). To configure the number of seconds to wait for a pending read/write operation before raising socket.timeout you can use:

    [distribute]
    channel_timeout = 250
    
  • Using BenchMaster http://pypi.python.org/pypi/benchmaster

  • Using Fabric http://tarekziade.wordpress.com/2010/12/09/funkload-fabric-quick-and-dirty-distributed-load-system/

  • Old school pssh/Makefile:

    # clean all node workspaces
    parallel-ssh -h hosts.txt rm -rf /tmp/ftests/
    # distribute tests
    parallel-scp -h hosts.txt -r ftests /tmp/ftests
    # launch a bench
    parallel-ssh -h hosts.txt -t -1 -o bench “(cd /tmp/ftests&& make bench URL=http://target/)”
    # get the results
    parallel-slurp -h hosts.txt -o out -L results-date -u ‘+%Y%m%d-%H%M%S’ -r /tmp/ftests/report .
    # build the report with fl-build-report, it supports the results merging

How can I accept gzip content encoding ?

You just need to add the appropriate header:

self.setHeader('Accept-encoding', 'gzip')

How can I mix different scenarios in a bench ?

Simple example with percent of users:

import random
...
def testMixin(self):
    if random.randint(1, 100) < 30:
        # 30% writer
        return self.testWriter()
    else:
        # 70% reader
        return self.testReader()

Example with fixed number of users:

def testMixin(self):
    if self.thread_id < 2:
        # 2 importer threads
        return self.testImporter()
    elif self.thread_id < 16:
        # 15 back office with sleep time
        return self.testBackOffice()
    else:
        # front office users
        return self.testFrontOffice()

Note that when mixing tests the detail report for each page is meaningless because you are mixing pages from multiple tests.

How can I modify a report ?

The report is in reStructuredText, the index.rst can be edited by hand. The HTML version can then be rebuilt:

rst2html --stylesheet=funkload.css   index.rst --traceback > index.html

Charts are built with gnuplot. The gplot script files are present in the report directory. To rebuild the pages charts, for instance:

gnuplot pages.gplot

Since FunkLoad 1.15 you can also use an org-mode output to edit or extend the report before exporting it as a PDF.

How can I automate stuff ?

Here is a sample Makefile

CREDCTL := fl-credential-ctl credential.conf
MONCTL := fl-monitor-ctl monitor.conf
LOG_HOME := ./log

ifdef URL
    FLOPS = -u $(URL) $(EXT)
else
    FLOPS = $(EXT)
endif

ifdef REPORT_HOME
    REPORT = $(REPORT_HOME)
else
    REPORT = report
endif

all: test

test: start test-app stop

bench: start bench-app stop

start:
    -mkdir -p $(REPORT) $(LOG_HOME)
    -$(MONCTL) restart
    -$(CREDCTL) restart

stop:
    -$(MONCTL) stop
    -$(CREDCTL) stop

test-app:
    fl-run-test -d --debug-level=3 --simple-fetch test_app.py App.test_app $(FLOPS)

bench-app:
    -fl-run-bench --simple-fetch test_app.py App.test_app -c 1:5:10:15:20:30:40:50 -D 45 -m 0.1 -M .5 -s 1 $(FLOPS)
    -fl-build-report $(LOG_HOME)/app-bench.xml --html -o $(REPORT)

clean:
    -find . "(" -name "*~" -or  -name ".#*" -or  -name "*.pyc" ")" -print0 | xargs -0 rm -f

It can be used like this:

make test
make test URL=http://override-url/
# add extra parameters to the FunkLoad command
make test EXT="-V"
make bench

How can I write fluent tests ?

You can use the PageObject and fluent interface patterns as in the Nuxeo DM tests to write test like this:

class MySuite(NuxeoTestCase):
     def testMyScenario(self):
         (LoginPage(self)
          .login('Administrator', 'Administrator')
          .getRootWorkspaces()
          .createWorkspace('My workspace', 'Test ws')
          .rights().grant('ReadWrite', 'members')
          .view()
          .createFolder('My folder', 'Test folder')
          .createFile('My file', 'Test file', 'foo.pdf')
          .getRootWorkspaces().deleteItem("My workspace")
          .logout())

How can I get release announcements ?

Watch the github repository: https://github.com/nuxeo/FunkLoad