write a 20GB file
in [Python]
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From: Patrick Maupin on 15 May 2010 20:30 On May 15, 7:09 pm, Dave Angel <da...(a)ieee.org> wrote: > Nathan Rice wrote: > > This is precisely the situation mmap was made for :) It has almost the same > > methods as a file so it should be an easy replacement. > > > <snip> > > Only on a 64bit system, and I'm not sure it's even possible there in > every case. On a 32bit system, it would be impossible to mmap a 20gb > file. You only have 4gb of address space to play with, total. > > DaveA
From: Patrick Maupin on 15 May 2010 20:32
On May 15, 7:09 pm, Dave Angel <da...(a)ieee.org> wrote: > Nathan Rice wrote: > > This is precisely the situation mmap was made for :) It has almost the same > > methods as a file so it should be an easy replacement. > > > <snip> > > Only on a 64bit system, and I'm not sure it's even possible there in > every case. On a 32bit system, it would be impossible to mmap a 20gb > file. You only have 4gb of address space to play with, total. > > DaveA Well, depending on the OS, I think you could have multiple mappings per file. So you could maintain your own mapping cache. That could get a bit ugly, but depending on what you are doing, it might not be too bad. Regards, Pat |