66 lines
2.3 KiB
Plaintext
66 lines
2.3 KiB
Plaintext
MBOX-Line: From eluis.linux at gmail.com Wed May 5 13:00:34 2010
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To: imap-protocol@u.washington.edu
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From: =?ISO-8859-1?Q?Eduardo_Lu=EDs?= <eluis.linux@gmail.com>
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Date: Fri Jun 8 12:34:43 2018
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Subject: [Imap-protocol] 2Gb size limit
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In-Reply-To: <alpine.OSX.2.00.1005051145060.709@hsinghsing.panda.com>
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References: <j2z2548ae4f1005050127j2ebd4af5w95af8888b9e0a185@mail.gmail.com>
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<h2l39e9aab51005050242xc44fa182ge03c6ba8f70ca6e4@mail.gmail.com>
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<z2p2548ae4f1005050300wb1b0abdew4ba33f8a9d74f0ab@mail.gmail.com>
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<alpine.OSX.2.00.1005051145060.709@hsinghsing.panda.com>
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Message-ID: <q2x2548ae4f1005051300u4ca18e39pf5433bae636d98d7@mail.gmail.com>
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Ok Mark, thanks a lot for your explanation...
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I have to switch to a mixed format....
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Thank you,
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Eduardo Lu?s
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2010/5/5 Mark Crispin <mrc+uw@panda.com>:
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> On Wed, 5 May 2010, Eduardo Lu?s wrote:
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>>
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>> No, it's not a 32bit OS feature.
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>
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> Actually, it is your OS.
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>
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> UW IMAP uses unsigned longs (it was largely written before off_t was
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> universally defined) which would support at least 4GB.
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>
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> The problem is that off_t is defined on many systems as an int32, and the
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> lseek() call takes an off_t. ?This is the cause of the 2GB limit.
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>
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> On other systems, off_t is defined as an int64. ?The limit should be 4GB,
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> not 2GB, on those system.
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>
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> If you have a int32 off_t, then you need to do one of the following:
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>
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> On some systems, you must change everything to use lseek64() call and
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> off64_t.
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>
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> On other systems, it is possible to fix lseek() and off_t by defining
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> _FILE_OFFSET_BITS to 64. ?That will make off_t be an int64. ?If ulong on
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> your system is a uint32, that should give you up to a 4GB limit; if ulong
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> on your system is a uint64 then you win big.
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>
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>
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> Personally, I think that it is completely, utterly, insane to have a flat
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> mailbox file greater than 2GB; or for that matter much greater than 100MB.
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> Flat file formats were never intended to scale to such sizes.
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>
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> You should use the mix format instead, which breaks the mailbox into
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> multiple files that are either 1MB or the size of a single message,
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> whichever is larger.
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>
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> Now, if you have a single message which is greater than 2GB (or 4GB), then
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> you have other problems.
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>
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> -- Mark --
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>
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> http://panda.com/mrc
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> Democracy is two wolves and a sheep deciding what to eat for lunch.
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> Liberty is a well-armed sheep contesting the vote.
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