How to create shared object instance thru fixture with pytest xdist

conftest.py

import pytest
from random import randint
import logging
import pickle

logging.basicConfig(filename="log.log", level=logging.INFO)

class App(object):
    def __init__(self):
        self.a = randint(0, 100)
        logging.info("initialized {}".format(self))

    def method(self):
        logging.info("method in app that print {}".format(self.a))

def pytest_configure(config):
    if not hasattr(config, "slaveinput"):
        config.app = App()

def pytest_configure_node(node):
    node.slaveinput["app"] = pickle.dumps(node.config.app)

@pytest.fixture(scope="session")
def app(request):
    return pickle.loads(request.config.slaveinput["app"])

log.log

INFO:root:initialized <conftest.App object at 0x02B07470>
INFO:root:method in app that print 46
INFO:root:method in app that print 46
INFO:root:method in app that print 46

pytestdebug.log

versions pytest-2.5.1, py-1.4.19, python-2.7.3.final.0
cwd=d:\temp\pytest-parallel-run
args=['--debug', '-s', '-v', '-n3', 'test_something.py']

  finish pytest_cmdline_parse --> <_pytest.config.Config object at 0x02776490> [hook]
pytest_cmdline_main [hook]
    config: <_pytest.config.Config object at 0x02776490>
  pytest_plugin_registered [hook]
      manager: <_pytest.config.PytestPluginManager object at 0x027604B0>
      plugin: <Session 'pytest-parallel-run'>
  pytest_configure [hook]
      config: <_pytest.config.Config object at 0x02776490>
    configured with mode set to 'rewrite' [assertion]
    pytest_plugin_registered [hook]
        manager: <_pytest.config.PytestPluginManager object at 0x027604B0>
        plugin: <_pytest.terminal.TerminalReporter instance at 0x02BB23C8>
    pytest_plugin_registered [hook]
        manager: <_pytest.config.PytestPluginManager object at 0x027604B0>
        plugin: <xdist.dsession.TerminalDistReporter instance at 0x02C2C3F0>
    pytest_plugin_registered [hook]
        manager: <_pytest.config.PytestPluginManager object at 0x027604B0>
        plugin: <xdist.dsession.DSession instance at 0x02C26968>
  pytest_sessionstart [hook]
      session: <Session 'pytest-parallel-run'>
    pytest_plugin_registered [hook]
        manager: <_pytest.config.PytestPluginManager object at 0x027604B0>
        plugin: <_pytest.python.FixtureManager instance at 0x02C2CAA8>
    pytest_report_header [hook]
        startdir: d:\temp\pytest-parallel-run
        config: <_pytest.config.Config object at 0x02776490>
      finish pytest_report_header --> ['plugins: xdist', ['using: pytest-2.5.1 pylib-1.4.19', 'setuptools registered plugins:', '  pytest-xdist-1.9 at c:\\Program Files (x86)\\Python27\\lib\\site-packages\\xdist\\plugin.pyc']] [hook]
    pytest_xdist_setupnodes [hook]
        config: <_pytest.config.Config object at 0x02776490>
        specs: [<XSpec 'popen'>, <XSpec 'popen'>, <XSpec 'popen'>]
    pytest_xdist_newgateway [hook]
        gateway: <Gateway id='gw0' receive-live, 0 active channels>
    pytest_xdist_newgateway [hook]
        gateway: <Gateway id='gw1' receive-live, 0 active channels>
    pytest_xdist_newgateway [hook]
        gateway: <Gateway id='gw2' receive-live, 0 active channels>
    setting up nodes [config:nodemanager]
    new basetemp c:\users\poliar~1\appdata\local\temp\pytest-96 [config:tmpdir]
    pytest_configure_node [hook]
        node: <SlaveController gw0>
    started node <SlaveController gw0> [config:nodemanager]
    pytest_configure_node [hook]
        node: <SlaveController gw1>
    started node <SlaveController gw1> [config:nodemanager]
    pytest_configure_node [hook]
        node: <SlaveController gw2>
    started node <SlaveController gw2> [config:nodemanager]
  pytest_collection [hook]
      session: <Session 'pytest-parallel-run'>
    finish pytest_collection --> True [hook]
  pytest_runtestloop [hook]
      session: <Session 'pytest-parallel-run'>
    pytest_testnodeready [hook]
        node: <SlaveController gw1>
    pytest_testnodeready [hook]
        node: <SlaveController gw0>
    pytest_testnodeready [hook]
        node: <SlaveController gw2>
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists' when='setup' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists' when='setup' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists3' when='setup' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists3' when='setup' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists' when='call' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists' when='call' outcome='passed'>
        finish pytest_report_teststatus --> ('passed', '.', 'PASSED') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists3' when='call' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists3' when='call' outcome='passed'>
        finish pytest_report_teststatus --> ('passed', '.', 'PASSED') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists' when='teardown' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists' when='teardown' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists3' when='teardown' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists3' when='teardown' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_testnodedown [hook]
        node: <SlaveController gw2>
        error: None
    pytest_testnodedown [hook]
        node: <SlaveController gw0>
        error: None
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists2' when='setup' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists2' when='setup' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists2' when='call' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists2' when='call' outcome='passed'>
        finish pytest_report_teststatus --> ('passed', '.', 'PASSED') [hook]
    pytest_runtest_logreport [hook]
        report: <TestReport 'test_something.py::test_exists2' when='teardown' outcome='passed'>
      pytest_report_teststatus [hook]
          report: <TestReport 'test_something.py::test_exists2' when='teardown' outcome='passed'>
        finish pytest_report_teststatus --> ('', '', '') [hook]
    pytest_testnodedown [hook]
        node: <SlaveController gw1>
        error: None
    finish pytest_runtestloop --> True [hook]
  pytest_sessionfinish [hook]
      session: <Session 'pytest-parallel-run'>
      exitstatus: 0
    pytest_terminal_summary [hook]
        terminalreporter: <_pytest.terminal.TerminalReporter instance at 0x02BB23C8>
  pytest_unconfigure [hook]
      config: <_pytest.config.Config object at 0x02776490>
    finish [config:tmpdir]

test_something.py

import pytest

def test_exists(app):
    app.method()

def test_exists2(app):
    app.method()

def test_exists3(app):
    app.method()