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On Apr 1 16:28, Michael Haubenwallner wrote: > Hi Corinna, > > On 3/28/19 9:30 PM, Corinna Vinschen wrote: > > can you please collect the base addresses of all DLLs generated during > > the build, plus their size and make a sorted list? It would be > > interesting to know if the hash algorithm in ld is actually as bad > > as I conjecture. > > Please find attached the output of rebase -i for the dlls after bootstrap > on Cygwin 3.0.4, each built with ld from binutils-2.31.1. > > > If we can improve on the distribution within the 8 Gigs area by changing > > ld's address generation(*), we may improve situations like these without > > too much hassle. As always, not a foolproof way out, but heck, 8 Gigs > > is a lot of space for a couple 100 DLLs. > > Feels like I need some Cygwin rebase step in Gentoo Prefix anyway, as there > are ~250 dlls right after bootstrap - without any application yet. For comparison, I have 1835 system DLLs installed, and they only take a bit less than 30% of the 8 Gigs. I'm surprised to see 7 collisions, one of them even using the exact same address. So the hash algorithm might be improvable. In hindsight, we also might have been better off with a bit more space for DLLs than 8 + 8 Gigs, I guess, given the size of the 64 bit address space. We can still get to that by updating Cygwin, rebase and binutils. For instance, assuming 32 Gigs + 32 Gigs, rebased DLLs would start at 0x2:00000000, non-rebased DLLs would start at 0xa:00000000 and the heap would start at 0x12:00000000. Still lots of room in the VM. However, that would probably not fix the exact collision between usr/bin/cygncurses++6.dll and usr/lib/python3.6/lib-dynload/_sha512.cpython-36m-x86_64-cygwin.dll Corinna -- Corinna Vinschen Cygwin Maintainer
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