read() wont allow me to read files larger than 2 gig (on a 64bit)


 
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Top Forums UNIX for Advanced & Expert Users read() wont allow me to read files larger than 2 gig (on a 64bit)
# 15  
Old 01-11-2010
For the third time, I'm sure you have. I'm sure they must be working on correcting the problem that prevents two-gig reads, as well; the sticky issue is likely how to manage that on 32-bit systems.

You weren't the OP, though, and my question was what these enormous reads were for in the first place. 9 out of 10 times I see someone sucking an enormous wad of raw data into RAM, they're not doing it for performance reasons -- they just want it all in RAM to get at it without further system calls. An mmap gets them that without decimating the cache and squeezing frequently-used things into swap for no good reason, and avoids this problem entirely.
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gensprep(8)							 ICU 50.1.2 Manual						       gensprep(8)

NAME
gensprep - compile StringPrep data from files filtered by filterRFC3454.pl SYNOPSIS
gensprep [ -h, -?, --help ] [ -v, --verbose ] [ -c, --copyright ] [ -s, --sourcedir source ] [ -d, --destdir destination ] DESCRIPTION
gensprep reads filtered RFC 3454 files and compiles their information into a binary form. The resulting file, <name>.icu, can then be read directly by ICU, or used by pkgdata(8) for incorporation into a larger archive or library. The files read by gensprep are described in the FILES section. OPTIONS
-h, -?, --help Print help about usage and exit. -v, --verbose Display extra informative messages during execution. -c, --copyright Include a copyright notice into the binary data. -s, --sourcedir source Set the source directory to source. The default source directory is specified by the environment variable ICU_DATA. -d, --destdir destination Set the destination directory to destination. The default destination directory is specified by the environment variable ICU_DATA. ENVIRONMENT
ICU_DATA Specifies the directory containing ICU data. Defaults to /usr/share/icu/50.1.2/. Some tools in ICU depend on the presence of the trailing slash. It is thus important to make sure that it is present if ICU_DATA is set. FILES
The following files are read by gensprep and are looked for in the source /misc for rfc3454_*.txt files and in source /unidata for Normal- izationCorrections.txt. rfc3453_A_1.txt Contains the list of unassigned codepoints in Unicode version 3.2.0.... rfc3454_B_1.txt Contains the list of code points that are commonly mapped to nothing.... rfc3454_B_2.txt Contains the list of mappings for casefolding of code points when Normalization form NFKC is specified.... rfc3454_C_X.txt Contains the list of code points that are prohibited for IDNA. NormalizationCorrections.txt Contains the list of code points whose normalization has changed since Unicode Version 3.2.0. VERSION
50.1.2 COPYRIGHT
Copyright (C) 2000-2002 IBM, Inc. and others. SEE ALSO
pkgdata(8) ICU MANPAGE
18 March 2003 gensprep(8)