Hi Alan It's on my list - I will do it as soon as I can :-). I actually think I had a similar system like this set up - although I think I used named semaphores. I would have to go back to the code to check.
Phil On 19 November 2016 at 07:39, Alan W. Irwin <ir...@beluga.phys.uvic.ca> wrote: > Hi Phil: > > I got tired of speculating about more efficient Linux IPC methods so I > implemented (as of commit e166866) the "Unnamed semaphores example" > paradigm outlined starting on page 73 of > <http://man7.org/conf/lca2013/IPC_Overview-LCA-2013-printable.pdf>. (I > discussed this possibility in earlier versions of this thread.) > This test project is described in cmake/test_linux_ipc/README. Follow > the directions there to test it on your own Linux systems. > > My tests show this method is quite efficient for transferring data > between processes on POSIX-compliant systems. The transfer process is > under complete control of unnamed semaphores that reside in the shared > memory so coordinating required data transfer between two applications > is completely straightforward, and there is very little idle time > required during these transfers. > > The IPC-relevant routines that are called in this test project are > shm_open, ftruncate, mmap, sem_init, sem_wait, sem_post, and > shm_unlink, and according to the Linux man pages, all of these > functions are provided by platforms that are compliant with POSIX.1-2001. > > So on the present evidence from this test project I think this method > looks extremely promising for efficiently transferring data both ways > between -dev wxwidgets and wxPLViewer for POSIX-compliant systems. > > If after trying the test of the method documented in > cmake/test_linux_ipc/README you agree with this assessment, would you > be willing to have a go at the required wxwidgets and wxPLViewer > source code changes to see if that essentially eliminates the > large idle times we have now on Linux? > > > Alan > __________________________ > Alan W. Irwin > > Astronomical research affiliation with Department of Physics and Astronomy, > University of Victoria (astrowww.phys.uvic.ca). > > Programming affiliations with the FreeEOS equation-of-state > implementation for stellar interiors (freeeos.sf.net); the Time > Ephemerides project (timeephem.sf.net); PLplot scientific plotting > software package (plplot.sf.net); the libLASi project > (unifont.org/lasi); the Loads of Linux Links project (loll.sf.net); > and the Linux Brochure Project (lbproject.sf.net). > __________________________ > > Linux-powered Science > __________________________ ------------------------------------------------------------------------------ _______________________________________________ Plplot-devel mailing list Plplot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/plplot-devel
