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python 2.7 + RHEL 6.5 + Shapely-1.4.4：MemoryError

分类: 技术问答 • 2022-08-28 22:30:59
问题描述：

我在RHEL 6.5上的两个部署中遇到了这个问题。找不到对谷歌搜索任何答案python 2.7 + RHEL 6.5 + Shapely-1.4.4：MemoryError

基本安装软件包

(nout)$ sudo rpm -qa | grep geos 
geos-devel-3.3.2-1.el6.x86_64 
geos-3.3.2-1.el6.x86_64 
geos-python-3.3.2-1.el6.x86_64

匀称安装

(nout)$ easy_install -Z Shapely-1.4.4.tar.gz 
Processing Shapely-1.4.4.tar.gz 
Writing /tmp/easy_install-iLylTY/Shapely-1.4.4/setup.cfg 
Running Shapely-1.4.4/setup.py -q bdist_egg --dist-dir /tmp/easy_install-iLylTY/Shapely-1.4.4/egg-dist-tmp-xFmed4 
Numpy or Cython not available, shapely.vectorized submodule not being built. 
shapely/speedups/_speedups.c: In function ‘__pyx_pf_7shapely_8speedups_9_speedups_2geos_linestring_from_py’: 
shapely/speedups/_speedups.c:1603: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c:2087: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c:2553: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c: In function ‘__pyx_pf_7shapely_8speedups_9_speedups_4geos_linearring_from_py’: 
shapely/speedups/_speedups.c:3118: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c:3127: warning: pointer targets in passing argument 3 of ‘GEOSCoordSeq_getSize_r’ differ in signedness 
/usr/include/geos_c.h:321: note: expected ‘unsigned int *’ but argument is of type ‘int *’ 
shapely/speedups/_speedups.c:3614: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c:4158: warning: assignment discards qualifiers from pointer target type 
shapely/speedups/_speedups.c: At top level: 
shapely/speedups/_speedups.c:924: warning: ‘__pyx_f_7shapely_8speedups_9_speedups_get_geos_context_handle’ defined but not used 
shapely/speedups/_speedups.c:1010: warning: ‘__pyx_f_7shapely_8speedups_9_speedups_geos_from_prepared’ defined but not used 
zip_safe flag not set; analyzing archive contents... 
shapely.geos: module references __file__ 
Adding Shapely 1.4.4 to easy-install.pth file

Python Shell中

(nout)$ python 
Python 2.7.8 (default, Sep 12 2014, 14:39:38) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-4)] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> from shapely.geometry import Polygon, Point 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/geometry/__init__.py", line 4, in <module> 
    from .base import CAP_STYLE, JOIN_STYLE 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/geometry/base.py", line 9, in <module> 
    from shapely.coords import CoordinateSequence 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/coords.py", line 8, in <module> 
    from shapely.geos import lgeos 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/geos.py", line 194, in <module> 
    error_h = EXCEPTION_HANDLER_FUNCTYPE(error_handler) 
MemoryError

Python Shell中

>>> from shapely.ops import transform 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/ops.py", line 13, in <module> 
    from shapely.geos import lgeos 
    File "/omd/nocout/nout/lib/python2.7/site-packages/Shapely-1.4.4-py2.7-linux-x86_64.egg/shapely/geos.py", line 194, in <module> 
    error_h = EXCEPTION_HANDLER_FUNCTYPE(error_handler) 
MemoryError

在调用importMemoryError收到

我无法理解的原因。

答

对于RHEL + selinux enabled + /tmp as noexec，试图访问和执行/tmp的任何模块都会生成一个MEMORY ERROR。

在我的情况，/tmp是noexec和SELinux的被实施

的/tmp默认为defaults,noexec,nosuid,nodev。

我设置：在看：https://bugzilla.redhat.com/show_bug.cgi?id=645193#c11

$ getsebool -a | grep httpd_tmp_exec 
httpd_tmp_exec --> on

不过问题依然存在，如果我正确地理解，这是因为：https://bugzilla.redhat.com/show_bug.cgi?id=582009

The libffi library tries to write to /tmp, 
which isn't allowed for the apache user in a default SELinux config 
(https://bugzilla.redhat.com/show_bug.cgi?id=582009). 
In this environment, importing ctypes always throws a MemoryError

所以选择httpd_tmp_exec --> on是没有用的对我来说。在我看到def _candidate_tempdir_list()

还有，如果有envnames TMPDIR，TEMP，TMP，Python将皮卡的临时位置：

我去寻找到蟒蛇LIB文件，搜索/tmp声明，我发现tempfile.py line 147。

要设置哪个变量？为此我去了libffi源代码，libffi-3.0.6。文件：src/closures.c行290 open_temp_exec_file_env, "TMPDIR", 0。

该TMPDIR是被设置的候选人。

我继续带安装/opt/app/tmp，设置export TMPDIR=/opt/app/tmp

做这一切工作正常，直到我用python idle，当我继续与nginx + uwsgi部署，我被同样的错误caughtup。现在我不确定为什么会发生这种情况，我认为必须是uwsgi执行问题。所以我第一次重新安装uwsgi，然后我修改了/location为nginx.conf看着：http://nginx.org/en/docs/http/ngx_http_uwsgi_module.html#uwsgi_temp_path集：uwsgi_temp_path

我重新启动所有的服务，nginx的，uwsgi。并尝试过。有效。

我也首先尝试：（安全）HACK：Python ctypes MemoryError in fcgi process from PIL library

结果是令人失望的我。

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