On Sun, May 24, 2009 at 7:22 AM, Antoine Pitrou <[email protected]> wrote: > > Hello, > > Launch a Python interactive session. Don't do anything special, just > launch it. Look at the memory usage of this process (e.g. `ps aux | > grep python`). The process takes about 4 MB. > > Then, just type : >>>> import tg > > Just that. Nothing else. No application modules or data. Look at the > process size again. Here it is 28 MB /just for having imported > TurboGears/. (your mileage may vary) > > This shows some of the problems associated with the TurboGears > approach of "re-use every third-party module under the sun". If you > suddenly find out that your mod_wsgi daemon process bubbles to 300MB+ > values, no, there isn't necessarily a memory leak in your Web > application. You are just using TurboGears :-) > This is also a misinterpretation, it fact it almost falls into the FUD argument. At runtime X lines of code are X lines of code it doesn't maters from where they come from.
Just for comparison, I know from a very good source than Django running under mod_python in a WebFaction server will take 20-30MB of RAM, per process (with 3 workers). go ahead and try your same experiment with that package. Now here is the fun fact. I'm sure TG+ all it's dependencies is many more LOC than django, someone should count those. Which simply means that your argument is completely reversed and using third-party dependencies is actually better as their memory footprint is smaller. > If your mod_wsgi setup has instantiated 8 worker threads, That is a ton of wasted RAM, you should be able to reduce our workers and increase their maxrequests and get the same results with much better ran. > Regards > > Antoine. > > > PS : those numbers are taken on a 64-bit setup. A 32-bit build of > Python would show significantly smaller numbers, due to the smaller > pointer (and C long) size. > > PPS : the cost of a single garbage collection then becomes quite funny > to watch, too: > - before tg is imported: > python -m timeit -s "import gc" "gc.collect()" > 100 loops, best of 3: 3.05 msec per loop > - after tg is imported: > python -m timeit -s "import tg, gc" "gc.collect()" > 10 loops, best of 3: 61.5 msec per loop > > > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "TurboGears" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/turbogears?hl=en -~----------~----~----~----~------~----~------~--~---
