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Date: Fri, 22 Feb 2013 23:40:24 +0800
Subject: gevent + urllib2 blocking
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Hi,

One problem, thanks for help.


import gevent.monkey
gevent.monkey.match_all()

from lxml import etree
# I using xpath parse the html


def _get(p):
    url = BUILD_URL(p)
    html = urllib2.urlopen(url)

    # RUN AT HERE AND BLOCKING

    # ver1
    tree = etree.parse(html, parse)

    # ver2
    # tree = etree.fromstring(html.read(), parse)

    ....


workers  = [gevent.spawn(_get, i) for i in xrange(1, 100)]
gevent.joinall(workers)



When using ver1,  etree.parse(html, parse)
I noticed there are only two greenlets runs at "RUN AT HERE AND BLOCKING"

others are not running!


But, when I using ver2,  this code will running normally as expected.


Why this ?

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Content-Type: text/html; charset=UTF-8
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<div dir=3D"ltr">Hi, <br><br>One problem, thanks for help.<br><br><br><span=
 style=3D"font-family:trebuchet ms,sans-serif"><font><span style=3D"font-fa=
mily:courier new,monospace">import gevent.monkey<br>gevent.monkey.match_all=
()<br>

<br>from lxml import etree<br># I using xpath parse the html<br><br><br>def=
 _get(p):<br>=C2=A0=C2=A0=C2=A0 url =3D BUILD_URL(p)<br>=C2=A0=C2=A0=C2=A0 =
html =3D urllib2.urlopen(url)<br><br>=C2=A0=C2=A0=C2=A0 # RUN AT HERE AND B=
LOCKING<br><br>=C2=A0=C2=A0=C2=A0 # ver1<br>=C2=A0=C2=A0=C2=A0 tree =3D etr=
ee.parse(html, parse)<br>

<br>=C2=A0=C2=A0=C2=A0 # ver2<br>=C2=A0=C2=A0=C2=A0 # tree =3D etree.fromst=
ring(html.read(), parse)<br><br>=C2=A0=C2=A0=C2=A0 ....<br><br><br>workers=
=C2=A0 =3D [gevent.spawn(_get, i) for i in xrange(1, 100)]<br>gevent.joinal=
l(workers)</span></font><br></span><br><br><br>When using ver1,=C2=A0 etree=
.parse(html, parse)<br>

I noticed there are only two greenlets runs at &quot;RUN AT HERE AND BLOCKI=
NG&quot;<br><br>others are not running!<br><br><br>But, when I using ver2,=
=C2=A0 this code will running normally as expected.<br><br><br>Why this ? <=
/div>

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