On Aug 13 11:23, Reini Urban wrote: > Corinna Vinschen schrieb: > ... > >Ok, back to mmap/munmap. Private anonymous mappings are implemented in > >Cygwin by calling VirtualAlloc/VirtualFree. However, due to > >restrictions in the Win32 API, VirtualFree is only called by munmap, as > >soon as *all* pages within a single mmap'ed area are free'ed by this or > >preceding calls to munmap. > > > >In other words, the mmap'ed memory will not be returned to the OS, if > >not the complete mmap'ed area is munmap'ed. Therefore I assume that the > >implementation in Lisp keeps bits of memory around which are not > >munmap'ed for some internal reason. > > > >Of course it's also possible that there's a bug in Cygwin related to the > >way mmap/munmap is called. But I have so far no evidence for that and > >simple mmap/munmap tests show that VirtualFree is called as soon as all > >pages in a mmap'ed area have been munmap'ed. If somebody thinks there's > >a bug in this implementation, please send a simple, self-contained > >testcase in pure C source code, which allows to reproduce the problem. > >Of course, patches are welcome, too :) > > And there's the known mmap() under cygwin limitation, esp. harmful to > clisp, that mmap() can only be properly aligned to a base address modulo > 64k (windows "allocation granularity"), and not the usual pagesize, if > it's 4k or 8k. windows pagesize is still 4k though. > > http://www.cygwin.com/ml/cygwin/2000-09/msg00380.html > http://www.cygwin.com/ml/cygwin/2004-09/msg00741.html
This is a non-issue since 1.5.19: http://cygwin.com/ml/cygwin-announce/2006-01/msg00016.html Corinna -- Corinna Vinschen Please, send mails regarding Cygwin to Cygwin Project Co-Leader cygwin AT cygwin DOT com Red Hat -- Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple Problem reports: http://cygwin.com/problems.html Documentation: http://cygwin.com/docs.html FAQ: http://cygwin.com/faq/