coreutils/src/base64.c, branch v8.22

base64: improve encoding I/O efficiency

2013-11-11T23:30:39Z

Since the I/O overhead is significant to the relatively simple processing done by this utility, use fputs() rather than fputc() to output '\n'. Time to process a 100MiB file was measured to decrease from 0.417s to 0.383s, i.e. an 8% improvement. Related to these changes, is a processing improvement in gnulib, which increases throughput by 60% when processing full buffers, which improves processing of a 100MiB file with standard wrapped output, down to 0.256s. http://git.sv.gnu.org/gitweb/?p=gnulib.git;a=commit;h=43fd1e7b Also increase the encoding buffer size from 3 to 30KiB. This was seen to give a further 8% improvement, taking processing time down to 0.235s in the wrapped output case. The decoding size buffer is not adjusted, due to the noted caveat with --ignore-garbage. * src/base64.c (BLOCKSIZE): Split into ENC_ and DEC_ variants, with the former increased from 3KiB to 30KiB. (wrap_write): Use the simpler fputc() rather than fputs() to output the '\n' character. Also check against EOF rather than < 0 for errors. (do_encode): Likewise. * NEWS: Mention the large increase in performance, which with the I/O improvements in coreutils and the processing improvement in gnulib, amount to about a 60% throughput increase.

maint: define usage note about mandatory args centrally

2013-01-23T00:03:38Z

Each program with at least one long option which is marked as 'required_argument' and which has also a short option for that option, should print a note about mandatory arguments. Define that well-known note centrally and use it rather than literal printf/fputs, and add it where it was missing. * src/system.h (emit_mandatory_arg_note): Add new function. * src/cp.c (usage): Use it rather than literal printf/fputs. * src/csplit.c, src/cut.c, src/date.c, src/df.c, src/du.c: * src/expand.c, src/fmt.c, src/fold.c, src/head.c, src/install.c: * src/kill.c, src/ln.c, src/ls.c, src/mkdir.c, src/mkfifo.c: * src/mknod.c, src/mv.c, src/nl.c, src/od.c, src/paste.c: * src/pr.c, src/ptx.c, src/shred.c, src/shuf.c, src/sort.c: * src/split.c, src/stdbuf.c, src/tac.c, src/tail.c, src/timeout.c: * src/touch.c, src/truncate.c, src/unexpand.c, src/uniq.c: Likewise. * src/base64.c (usage): Add call of the above new function because at least one long option has a required argument. * src/basename.c, src/chcon.c, src/date.c, src/env.c: * src/nice.c, src/runcon.c, src/seq.c, src/stat.c, src/stty.c: Likewise.

maint: update all copyright year number ranges

2013-01-01T03:51:20Z

Run "make update-copyright", but then also run this, perl -pi -e 's/2\d\d\d-//' tests/sample-test to make that one script use the single most recent year number.

maint: src/*.c: change remaining quotes (without embedded spaces)

2012-01-09T20:50:08Z

Run this (twice): git grep -E -l '`[^ ]+'\' src/*.c \ |xargs perl -pi -e 's/`([^ ]+'\'')/'\''$1/'

maint: use new emit_try_help in place of equivalent fprintf

2012-01-07T15:54:26Z

Run this command: perl -0777 -pi -e \ 's/fprintf \(stderr, _\("Try `%s --help.*\n.*;/emit_try_help ();/m'\ src/*.c

maint: update all copyright year number ranges

2012-01-01T09:04:06Z

Run "make update-copyright".

maint: update all copyright year number ranges

2011-01-01T21:16:47Z

Run "make update-copyright".

provide POSIX_FADV_SEQUENTIAL hint to appropriate utils

2010-07-22T00:04:47Z

Following on from commit dae35bac, 01-03-2010, "sort: inform the system about our input access pattern" apply the same hint to all appropriate utils. This currently gives around a 5% speedup for reading large files from fast flash devices on GNU/Linux. * src/base64.c: Call fadvise (..., FADVISE_SEQUENTIAL); * src/cat.c: Likewise. * src/cksum.c: Likewise. * src/comm.c: Likewise. * src/cut.c: Likewise. * src/expand.c: Likewise. * src/fmt.c: Likewise. * src/fold.c: Likewise. * src/join.c: Likewise. * src/md5sum.c: Likewise. * src/nl.c: Likewise. * src/paste.c: Likewise. * src/pr.c: Likewise. * src/ptx.c: Likewise. * src/shuf.c: Likewise. * src/sum.c: Likewise. * src/tee.c: Likewise. * src/tr.c: Likewise. * src/tsort.c: Likewise. * src/unexpand.c: Likewise. * src/uniq.c: Likewise. * src/wc.c: Likewise, unless we don't actually read().

maint: correct indentation of case_GETOPT_* macro uses

2010-05-31T09:02:21Z

* src/base64.c (main): Correct indentation of syntactically questionable case_GETOPT_HELP_CHAR and case_GETOPT_VERSION_CHAR macros. * src/who.c (main): Likewise.

base64: always treat input in binary mode

2010-04-22T14:42:54Z

Necessary for cygwin. Technically, this patch is not correct, in that it clobbers O_APPEND, but it is no different than any other use of xfreopen to force binary mode, so all such uses should be fixed at once in a later patch. * src/base64.c (main): Open input in binary mode. * THANKS: Update. Reported by Yutaka Amanai.