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From: Xavier Ho <contact@xavierho.com>
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Subject: Python 2 multiprocessing examples in docs.python.org
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Hey all,

I ran the example code on multiprocessing.  On the "Pool example", an
assertion failed with "testing garbage collection".

Traceback (most recent call last):
  File "test.py", line 314, in <module>
    test()
  File "test.py", line 295, in test
    assert not worker.is_alive()
AssertionError

The relevant example code reads:

    pool =3D multiprocessing.Pool(2)
    DELTA =3D 0.1
    processes =3D pool._pool
    ignore =3D pool.apply(pow3, [2])
    results =3D [pool.apply_async(time.sleep, [DELTA]) for i in range(100)]

    results =3D pool =3D None

    time.sleep(DELTA * 2)

    for worker in processes:
        assert not worker.is_alive()

My questions are 1) How does that GC test work, and 2) Does that mean my GC
isn't working as fast as it should have been?

The machine's Python:

xav =E2=9D=96 /tmp  > python
Python 2.7.3 (v2.7.3:70274d53c1dd, Apr  9 2012, 20:52:43)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.

Cheers,
Xav

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<div dir=3D"ltr">Hey all,<div><br></div><div style>I ran the example code o=
n multiprocessing. =C2=A0On the &quot;Pool example&quot;, an assertion fail=
ed with &quot;testing garbage collection&quot;.</div><div style><br></div><=
div style>

<div><font face=3D"courier new, monospace">Traceback (most recent call last=
):</font></div><div><font face=3D"courier new, monospace">=C2=A0 File &quot=
;test.py&quot;, line 314, in &lt;module&gt;</font></div><div><font face=3D"=
courier new, monospace">=C2=A0 =C2=A0 test()</font></div>

<div><font face=3D"courier new, monospace">=C2=A0 File &quot;test.py&quot;,=
 line 295, in test</font></div><div><font face=3D"courier new, monospace">=
=C2=A0 =C2=A0 assert not worker.is_alive()</font></div><div><font face=3D"c=
ourier new, monospace">AssertionError</font></div>

<div><br></div><div style>The relevant example code reads:</div><div style>=
<br></div><div style><div><font face=3D"courier new, monospace">=C2=A0 =C2=
=A0 pool =3D multiprocessing.Pool(2)</font></div><div><font face=3D"courier=
 new, monospace">=C2=A0 =C2=A0 DELTA =3D 0.1</font></div>

<div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 processes =3D pool=
._pool</font></div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0=
 ignore =3D pool.apply(pow3, [2])</font></div><div><font face=3D"courier ne=
w, monospace">=C2=A0 =C2=A0 results =3D [pool.apply_async(time.sleep, [DELT=
A]) for i in range(100)]</font></div>

<div><font face=3D"courier new, monospace"><br></font></div><div><font face=
=3D"courier new, monospace">=C2=A0 =C2=A0 results =3D pool =3D None</font><=
/div><div><font face=3D"courier new, monospace"><br></font></div><div><font=
 face=3D"courier new, monospace">=C2=A0 =C2=A0 time.sleep(DELTA * 2)</font>=
</div>

<div><font face=3D"courier new, monospace"><br></font></div><div><font face=
=3D"courier new, monospace">=C2=A0 =C2=A0 for worker in processes:</font></=
div><div><font face=3D"courier new, monospace">=C2=A0 =C2=A0 =C2=A0 =C2=A0 =
assert not worker.is_alive()</font></div>

</div></div><div style><br></div><div style>My questions are 1) How does th=
at GC test work, and 2) Does that mean my GC isn&#39;t working as fast as i=
t should have been?</div><div><br></div><div style>The machine&#39;s Python=
:</div>

<div style><br></div><div style><div><font face=3D"courier new, monospace">=
xav =E2=9D=96 /tmp =C2=A0&gt; python</font></div><div><font face=3D"courier=
 new, monospace">Python 2.7.3 (v2.7.3:70274d53c1dd, Apr =C2=A09 2012, 20:52=
:43)=C2=A0</font></div>

<div><font face=3D"courier new, monospace">[GCC 4.2.1 (Apple Inc. build 566=
6) (dot 3)] on darwin</font></div><div><font face=3D"courier new, monospace=
">Type &quot;help&quot;, &quot;copyright&quot;, &quot;credits&quot; or &quo=
t;license&quot; for more information.</font></div>

</div><div><br clear=3D"all"><div>Cheers,<div>Xav</div></div>
</div></div>

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