Hi Corinna > > Dear cygwin folks > > > > It seems like there's a limit of the number of possible child > > processes defined to 256 with 'NPROCS' in //winsup/cygwin/child_info.h > > used in 'cprocs' in //winsup/cygwin/sigproc.cc > > > > 256 is quite few possible children in an enterprise environment and > > perhaps the limit should be limited by the physical resources or > possibly Windows ? > > The info has to be kept available in the process itself so we need this > array of NPROCS * sizeof (pinfo). > > Of course, there's no reason to use a static array, the code could just as > well use a dynamically allocated array or a linked list. It's just not > the way it is right now and would need a patch or rewrite. > > As for the static array, sizeof pinfo is 64, so the current size of the > array is just 16K. We could easily bump it to 64K with NPROCS raised to > 1024 for the next Cygwin release, at least on 64 bit. > I don't think we should raise this limit for 32 bit Cygwin, which is kind > of EOL anyway, given the massive restrictions.
I don't know the exact purpose of this and how the cprocs is used, but I'd prefer something totally dynamic 7 days out of 7 or otherwise another limit would just bite you in the ass some other day instead ;-) A linked list could be used if you wanna optimize (dynamic) memory usage but an (amortized) array would probably provide faster linear search but I guess simplicity of the code and external functionality is the most important demands for this choice I'm looking forward for a future release where there's no children limit Keep up the good work Best regards, Kristian > Corinna > > -- > Corinna Vinschen > Cygwin Maintainer > -- > Problem reports: https://cygwin.com/problems.html > FAQ: https://cygwin.com/faq/ > Documentation: https://cygwin.com/docs.html > Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple -- Problem reports: https://cygwin.com/problems.html FAQ: https://cygwin.com/faq/ Documentation: https://cygwin.com/docs.html Unsubscribe info: https://cygwin.com/ml/#unsubscribe-simple
