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• Installing Mod-wsgi 3.3 for apache 2.2 and python 3.2

  - by aaronasterling

  I am attempting to install Mod-wsgi 3.3 on an ubuntu 11.10 desktop edition with apache 2.2 and python 3.2 I downloaded the source tarball and extracted it. I configured it using the --with-python=/usr/bin/python3 option to configure. This is the only copy of python3 that I have installed. I then issued the commands make and sudo make install. I attempted to restart apache using sudo /etc/init.d/apache2 restart and get the following error message: apache2: Syntax error on line 203 of /etc/apache2/apache2.conf: Syntax error on line 1 of /etc/apache2/mods-enabled/wsgi.load: Cannot load /usr/lib/apache2/modules /mod_wsgi.so into server: /usr/lib/apache2/modules/mod_wsgi.so: undefined symbol: PyCObject_FromVoidPtr Action 'configtest' failed. The Apache error log may have more information. ...fail! The error logs only inform us that it's a segfault: ` I checked to make sure that it's linked against the right python library with ldd mod_wsgi.so and got the output linux-gate.so.1 => (0x00d66000) libpython3.2mu.so.1.0 => /usr/lib/libpython3.2mu.so.1.0 (0x0065b000) libpthread.so.0 => /lib/i386-linux-gnu/libpthread.so.0 (0x00a20000) libc.so.6 => /lib/i386-linux-gnu/libc.so.6 (0x00110000) libssl.so.1.0.0 => /lib/i386-linux-gnu/libssl.so.1.0.0 (0x0028c000) libcrypto.so.1.0.0 => /lib/i386-linux-gnu/libcrypto.so.1.0.0 (0x0044c000) libffi.so.6 => /usr/lib/i386-linux-gnu/libffi.so.6 (0x002d9000) libz.so.1 => /lib/i386-linux-gnu/libz.so.1 (0x00eb3000) libexpat.so.1 => /lib/i386-linux-gnu/libexpat.so.1 (0x00abe000) libdl.so.2 => /lib/i386-linux-gnu/libdl.so.2 (0x002e0000) libutil.so.1 => /lib/i386-linux-gnu/libutil.so.1 (0x00c47000) libm.so.6 => /lib/i386-linux-gnu/libm.so.6 (0x00e24000) /lib/ld-linux.so.2 (0x0042c000) It seems to be linking against the python3 library so I'm not sure what the issue is. I have read on another question that mod-python can present problems however it was never installed. I saw that the directive WSGIPythonHome can be used to point to the correct python version and created a directory /usr/bin/apache2-python/ with a link named python and python3(the name I passed to the configure script) to /usr/bin/python3 This results in the same error. So I'm pretty sure it's using the correct version of python. I am now at a loss. Thanks in advance for any help. update Using the version from the repository I get the following log when I attempt to request a page: [Wed Mar 21 13:21:11 2012] [notice] child pid 5567 exit signal Aborted (6) Fatal Python error: Py_Initialize: Unable to get the locale encoding LookupError: no codec search functions registered: can't find encoding [Wed Mar 21 13:21:13 2012] [notice] child pid 5568 exit signal Aborted (6) Fatal Python error: Py_Initialize: Unable to get the locale encoding LookupError: no codec search functions registered: can't find encoding [Wed Mar 21 13:21:14 2012] [notice] caught SIGTERM, shutting down If I comment out the instruction to load mod-wsgi, the page serves normally.

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• Blit Queue Optimization Algorithm

  - by martona

  I'm looking to implement a module that manages a blit queue. There's a single surface, and portions of this surface (bounded by rectangles) are copied to elsewhere within the surface: add_blt(rect src, point dst); There can be any number of operations posted, in order, to the queue. Eventually the user of the queue will stop posting blits, and ask for an optimal set of operations to actually perform on the surface. The task of the module is to ensure that no pixel is copied unnecessarily. This gets tricky because of overlaps of course. A blit could re-blit a previously copied pixel. Ideally blit operations would be subdivided in the optimization phase in such a way that every block goes to its final place with a single operation. It's tricky but not impossible to put this together. I'm just trying to not reinvent the wheel. I looked around on the 'net, and the only thing I found was the SDL_BlitPool Library which assumes that the source surface differs from the destination. It also does a lot of grunt work, seemingly unnecessarily: regions and similar building blocks are a given. I'm looking for something higher-level. Of course, I'm not going to look a gift horse in the mouth, and I also don't mind doing actual work... If someone can come forward with a basic idea that makes this problem seem less complex than it does right now, that'd be awesome too. EDIT: Thinking about aaronasterling's answer... could this work? Implement customized region handler code that can maintain metadata for every rectangle it contains. When the region handler splits up a rectangle, it will automatically associate the metadata of this rectangle with the resulting sub-rectangles. When the optimization run starts, create an empty region handled by the above customized code, call this the master region Iterate through the blt queue, and for every entry: Let srcrect be the source rectangle for the blt beng examined Get the intersection of srcrect and master region into temp region Remove temp region from master region, so master region no longer covers temp region Promote srcrect to a region (srcrgn) and subtract temp region from it Offset temp region and srcrgn with the vector of the current blt: their union will cover the destination area of the current blt Add to master region all rects in temp region, retaining the original source metadata (step one of adding the current blt to the master region) Add to master region all rects in srcrgn, adding the source information for the current blt (step two of adding the current blt to the master region) Optimize master region by checking if adjacent sub-rectangles that are merge candidates have the same metadata. Two sub-rectangles are merge candidates if (r1.x1 == r2.x1 && r1.x2 == r2.x2) | (r1.y1 == r2.y1 && r1.y2 == r2.y2). If yes, combine them. Enumerate master region's sub-rectangles. Every rectangle returned is an optimized blt operation destination. The associated metadata is the blt operation`s source.

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