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parallel: implemented --regexp. Prepended 'parallel:' to warnings
This commit is contained in:
Ole Tange
parent
cb468fb6d3
commit
ad61df30f0
20
configure
vendored
20
configure
vendored
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@ -1,6 +1,6 @@
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#! /bin/sh
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# Guess values for system-dependent variables and create Makefiles.
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# Generated by GNU Autoconf 2.67 for parallel 20110126.
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# Generated by GNU Autoconf 2.67 for parallel 20110130.
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#
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# Report bugs to <bug-parallel@gnu.org>.
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#
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@ -551,8 +551,8 @@ MAKEFLAGS=
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# Identity of this package.
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PACKAGE_NAME='parallel'
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PACKAGE_TARNAME='parallel'
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PACKAGE_VERSION='20110126'
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PACKAGE_STRING='parallel 20110126'
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PACKAGE_VERSION='20110130'
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PACKAGE_STRING='parallel 20110130'
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PACKAGE_BUGREPORT='bug-parallel@gnu.org'
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PACKAGE_URL=''
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@ -1168,7 +1168,7 @@ if test "$ac_init_help" = "long"; then
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# Omit some internal or obsolete options to make the list less imposing.
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# This message is too long to be a string in the A/UX 3.1 sh.
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cat <<_ACEOF
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\`configure' configures parallel 20110126 to adapt to many kinds of systems.
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\`configure' configures parallel 20110130 to adapt to many kinds of systems.
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Usage: $0 [OPTION]... [VAR=VALUE]...
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@ -1234,7 +1234,7 @@ fi
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if test -n "$ac_init_help"; then
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case $ac_init_help in
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short | recursive ) echo "Configuration of parallel 20110126:";;
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short | recursive ) echo "Configuration of parallel 20110130:";;
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esac
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cat <<\_ACEOF
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@ -1301,7 +1301,7 @@ fi
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test -n "$ac_init_help" && exit $ac_status
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if $ac_init_version; then
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cat <<\_ACEOF
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parallel configure 20110126
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parallel configure 20110130
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generated by GNU Autoconf 2.67
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Copyright (C) 2010 Free Software Foundation, Inc.
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@ -1318,7 +1318,7 @@ cat >config.log <<_ACEOF
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This file contains any messages produced by compilers while
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running configure, to aid debugging if configure makes a mistake.
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It was created by parallel $as_me 20110126, which was
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It was created by parallel $as_me 20110130, which was
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generated by GNU Autoconf 2.67. Invocation command line was
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$ $0 $@
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@ -2133,7 +2133,7 @@ fi
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# Define the identity of the package.
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PACKAGE='parallel'
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VERSION='20110126'
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VERSION='20110130'
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cat >>confdefs.h <<_ACEOF
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@ -2684,7 +2684,7 @@ cat >>$CONFIG_STATUS <<\_ACEOF || ac_write_fail=1
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# report actual input values of CONFIG_FILES etc. instead of their
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# values after options handling.
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ac_log="
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This file was extended by parallel $as_me 20110126, which was
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This file was extended by parallel $as_me 20110130, which was
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generated by GNU Autoconf 2.67. Invocation command line was
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CONFIG_FILES = $CONFIG_FILES
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@ -2746,7 +2746,7 @@ _ACEOF
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cat >>$CONFIG_STATUS <<_ACEOF || ac_write_fail=1
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ac_cs_config="`$as_echo "$ac_configure_args" | sed 's/^ //; s/[\\""\`\$]/\\\\&/g'`"
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ac_cs_version="\\
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parallel config.status 20110126
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parallel config.status 20110130
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configured by $0, generated by GNU Autoconf 2.67,
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with options \\"\$ac_cs_config\\"
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|
|
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@ -1,4 +1,4 @@
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AC_INIT([parallel], [20110126], [bug-parallel@gnu.org])
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AC_INIT([parallel], [20110130], [bug-parallel@gnu.org])
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AM_INIT_AUTOMAKE([-Wall -Werror foreign])
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AC_CONFIG_HEADERS([config.h])
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AC_CONFIG_FILES([
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160
doc/FUTURE_IDEAS
160
doc/FUTURE_IDEAS
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@ -85,7 +85,7 @@ Prøv fieldsep: Find eet tegn, som optræder det samme antal gange i alle linjer
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Prøv klyngesep: Find den samme klynge tegn, som står samme antal gange i alle linjer (' | ' sep)
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Fjern whitespace før og efter colonne
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hvis der er n af tegn A og 2n af tegn B, så
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hvis der er n af tegn A og 2n af tegn B, så
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a | b | c
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@ -112,6 +112,160 @@ colsep = [sepchars]{no_of_sepchars}
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# TODO compute how many can be transferred within max_line_length
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# TODO Unittest with filename that is long and requires a lot of quoting. Will there be to many
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=head1 YouTube video --pipe
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cp parallel.fasta parallel.mbox lucene.tar
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# GNU Parallel 20110205 - The FOSDEM Release
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I assume you already know GNU Parallel. If not watch the intro video first.
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GNU Parallel has so far worked similar to xargs. But the FOSDEM
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release of GNU Parallel introduces the new --pipe option. It makes GNU
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Parallel work similar to tee.
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tee pipes a copy of the output to a file and a copy to another
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program.
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seq 1 5 | tee myfile | wc
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Here it pipes a copy to the file myfile and to the command word count (wc).
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cat myfile
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and we can see the content is what we expected.
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The pipe option of GNU Parallel splits data into records and pipes a
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block of records into a program:
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seq 1 5 | parallel --pipe -N1 cat';' echo foo
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Here we pipe each number to the command cat and print foo after
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running cat.
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GNU Parallel does this in parallel starting one process per cpu so the
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order may be different because one command may finish before another.
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# RECORD SEPARATORS
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GNU Parallel splits on record separators.
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seq 1 5 | parallel --pipe --recend '\n' -N1 cat';' echo foo
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This is the example we saw before: the record separator is \n and
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--recend will keep the record separator at the end of the record.
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But if what your records start with a record separator? Here is a
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fast-a file:
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cat parallel.fasta
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Every record start with a >. To keep that with the record you use
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--recstart:
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cat parallel.fasta | parallel --pipe --recstart '>' -N1 cat';' echo foo
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But what if you have both? mbox files is an example that has both an
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ending and starting separator:
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cat parallel.mbox |
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parallel --pipe --recend '\n\n' --recstart 'From ' -N1 cat';' echo foo | less #
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The two newlines are staying with the email before and the From_ stays with the next record.
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GNU Parallel cannot guarantee the first record will start with record
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separator and it cannot guarantee the last record will end with record
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separator. You will simply get what is first and last.
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But GNU Parallel _does_ guarantee that it will only split at record
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separators.
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# NUMBER OF RECORDS
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So far we have used -N1. This tells GNU Parallel to pipe one record to
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the program.
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seq 1 5 | parallel --pipe -N1 cat';' echo foo
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But we can choose any amount:
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seq 1 5 | parallel --pipe -N3 cat';' echo foo
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This will pipe blocks of 3 records into cat and if there is not enough the last will only get two.
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# BLOCKSIZE
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However, using -N is inefficient. It is faster to pipe a full block into the program.
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cat /usr/share/dict/words | parallel --pipe --blocksize 500k wc
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We here tell GNU Parallel to split on \n and pipe blocks of 500 KB to
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wc. 1 MB is the default:
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cat /usr/share/dict/words | parallel --pipe wc
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If you just have a bunch of bytes you often do not care about the
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record separator. To split input into chunks you can disable the
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--recend
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ls -l lucene.tar
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cat lucene.tar | parallel --pipe --recend '' -k gzip > lucene.tar.gz
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GNU Parallel will then split the input into 1 MB blocks; pipe that to
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gzip and -k will make sure the order of the output is kept before
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saving to the tar.gz file.
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The beauty of gzip is that if you concatenate two gzip files it is a
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valid gzip file. To test this:
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tar tvzf lucene.tar.gz #
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# OUTPUT AS FILE
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Sometimes the output of GNU Parallel cannot be mixed in a single stream like this:
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seq 1 10 | shuf | parallel --pipe -N 3 sort -n
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As you can see each block of 3 is sorted but the whole output is not sorted.
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GNU Parallel can give the output in file. GNU Parallel will the list the
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files created:
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seq 1 10 | shuf | parallel --pipe --files -N 3 sort -n
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Each of these files contains a sorted block:
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cat
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Sort has -m to merge sorted files into a sorted stream
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seq 1 10 | shuf | parallel --pipe --files -N 3 sort -n | parallel -mj1 sort -nm
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-m will append all the files behind the sort command and the -j1 will
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make sure we only run one command. The only part missing now is
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cleaning up by removing the temporary files. We can do that by
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appending rm
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seq 1 10 | shuf | parallel --pipe --files -N 3 sort -n |
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parallel -mj1 sort -nm {} ";"rm {}
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# Thank you for watching
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#
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# If you like GNU Parallel:
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# * Post this video on forums/blogs/Twitter/Facebook/Linkedin
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# * Join the mailing list http://lists.gnu.org/mailman/listinfo/parallel
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# * Request or write a review for your favourite magazine
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# * Request or build a package for your favourite distribution
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# * Invite me for your next conference (Contact http://ole.tange.dk)
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#
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# If GNU Parallel saves you money:
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# * (Have your company) donate to FSF https://my.fsf.org/donate/
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#
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# Find GNU Parallel at http://www.gnu.org/software/parallel/
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=head1 YouTube video2
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Converting of WAV files to MP3 using GNU Parallel
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@ -177,7 +331,7 @@ it easy to distribute jobs to these.
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terminal2: ssh parallel@vh2.pi.dk
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ssh parallel@vh2.pi.dk
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and
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and
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PS1="\[\e[7m\]GNU Parallel:\[\033[01;34m\]\w\[\033[00m\e[27m\]$ "
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gunzip logs/*gz
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@ -362,7 +516,7 @@ find . -name '*.gz' | parallel -j+0 "zcat {} | bzip2 >{.}.bz2 && rm {}"
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# Create a directory for each zip-file and unzip it in that dir
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parallel 'mkdir {.}; cd {.}; unzip ../{}' ::: *.zip
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# Convert all *.mp3 in subdirs to *.ogg running
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# Convert all *.mp3 in subdirs to *.ogg running
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# one process per CPU core on local computer and server2
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find . -name '*.mp3' | parallel --trc {.}.ogg -j+0 -S server2,: \
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'mpg321 -w - {} | oggenc -q0 - -o {.}.ogg'
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|
|
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@ -66,12 +66,14 @@ echo put parallel-$YYYYMMDD.tar.bz2{,.sig,*asc} | ncftp ftp://ftp-upload.gnu.org
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== Download and test ==
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pushd /tmp
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rm parallel-$YYYYMMDD.tar.bz2
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wget http://ftp.gnu.org/gnu/parallel/parallel-$YYYYMMDD.tar.bz2
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#wget http://alpha.gnu.org/gnu/parallel/parallel-$YYYYMMDD.tar.bz2
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tar xjvf parallel-$YYYYMMDD.tar.bz2
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cd parallel-$YYYYMMDD
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./configure
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make -j && sudo make -j install
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pushd
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== Update OpenSUSE build system ==
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@ -138,17 +140,22 @@ cc:Peter Simons <simons@cryp.to>, Sandro Cazzaniga <kharec@mandriva.org>,
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ryoichiro.suzuki@gmail.com,kerick@shiftedbit.net,
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Christian Faulhammer <fauli@gentoo.org>, Ryoichiro Suzuki <ryoichiro.suzuki@gmail.com>
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Subject: GNU Parallel 2011XXXX released
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Subject: GNU Parallel 20110205 (FOSDEM release) released
|
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GNU Parallel 2011XXXX has been released. It is available for
|
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download at: http://ftp.gnu.org/gnu/parallel/
|
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GNU Parallel 20110205 (the FOSDEM release) has been released. It is
|
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available for download at: http://ftp.gnu.org/gnu/parallel/
|
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|
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This is a major release as the --pipe option introduces a new way to
|
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work. To learn about --pipe see the example section for uses of
|
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--pipe.
|
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work. GNU Parallel has so far been similar to xargs, with --pipe it
|
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becomes somewhat similar to tee. To learn about --pipe see the example
|
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section for uses of --pipe.
|
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|
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But rest assured: No old functionality is changed.
|
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|
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If you want GNU Parallel to be part of your favourite distribution
|
||||
contact the people maintaining the distribution (complaining on
|
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Twitter is not enough).
|
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New in this release:
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* --pipe splits piped data into blocks. Each block is piped to a
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@ -170,12 +177,22 @@ New in this release:
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followed immediately by a start of a record. This is useful if
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either recend or recstart can occur in the middle of a record.
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* --remove-rec-sep removes the string matched by --recstart and
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--recend.
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* --regexp will make GNU Parallel treat --recstart and --recend as
|
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regular expressions.
|
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|
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* --output-as-files will put the output of the programs into files and
|
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instead of giving the output GNU Parallel will output the name of
|
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these files.
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|
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* -N set the number of records to read. If used with --blocksize
|
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the block read will at most be --blocksize.
|
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* -N if used with --pipe sets the number of records to read.
|
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|
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* GNU Parallel was presented at FOSDEM.
|
||||
|
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* Article in USENIX Magazine ;login: (print)
|
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http://www.usenix.org/publications/login/2011-02/
|
||||
|
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* GNU Parallel is now on ohloh.net. Thanks to Wim Muskee.
|
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https://www.ohloh.net/p/gnu-parallel
|
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|
|
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@ -236,7 +236,7 @@ B<parallel>(1), B<nice>(1)
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use strict;
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use Getopt::Long;
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$Global::progname="niceload";
|
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$Global::version = 20110126;
|
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$Global::version = 20110130;
|
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Getopt::Long::Configure("bundling","require_order");
|
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get_options_from_array(\@ARGV) || die_usage();
|
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if($::opt_version) {
|
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|
|
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39
src/parallel
39
src/parallel
|
|
@ -88,17 +88,17 @@ sub spreadstdin {
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# If both --recstart and --recend is given then both must match
|
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$recstart = $::opt_recstart;
|
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$recend = $::opt_recend;
|
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$recerror = "Warning: --recend and --recstart unmatched. Is --blocksize too small?";
|
||||
$recerror = "parallel: Warning: --recend and --recstart unmatched. Is --blocksize too small?";
|
||||
} elsif(defined($::opt_recstart)) {
|
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# If --recstart is given it must match start of record
|
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$recstart = $::opt_recstart;
|
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$recend = "";
|
||||
$recerror = "Warning: --recstart unmatched. Is --blocksize too small?";
|
||||
$recerror = "parallel: Warning: --recstart unmatched. Is --blocksize too small?";
|
||||
} elsif(defined($::opt_recend)) {
|
||||
# If --recend is given then it must match end of record
|
||||
$recstart = "";
|
||||
$recend = $::opt_recend;
|
||||
$recerror = "Warning: --recend unmatched. Is --blocksize too small?";
|
||||
$recerror = "parallel: Warning: --recend unmatched. Is --blocksize too small?";
|
||||
}
|
||||
|
||||
while(read(STDIN,substr($buf,length $buf,0),$::opt_blocksize)) {
|
||||
|
|
@ -333,6 +333,7 @@ sub get_options_from_array {
|
|||
"pipe|spreadstdin" => \$::opt_pipe,
|
||||
"recstart=s" => \$::opt_recstart,
|
||||
"recend=s" => \$::opt_recend,
|
||||
"regexp|regex" => \$::opt_regexp,
|
||||
"remove-rec-sep|removerecsep|rrs" => \$::opt_remove_rec_sep,
|
||||
"files|output-as-files|outputasfiles" => \$::opt_files,
|
||||
"block|block-size|blocksize=s" => \$::opt_blocksize,
|
||||
|
|
@ -377,7 +378,7 @@ sub get_options_from_array {
|
|||
sub parse_options {
|
||||
# Returns: N/A
|
||||
# Defaults:
|
||||
$Global::version = 20110126;
|
||||
$Global::version = 20110130;
|
||||
$Global::progname = 'parallel';
|
||||
$Global::infinity = 2**31;
|
||||
$Global::debug = 0;
|
||||
|
|
@ -519,7 +520,7 @@ sub parse_options {
|
|||
# As we do not know the max line length on the remote machine
|
||||
# long commands generated by xargs may fail
|
||||
# If opt_N is set, it is probably safe
|
||||
print STDERR ("Warning: using -X or -m with --sshlogin may fail\n");
|
||||
print STDERR ("parallel: Warning: using -X or -m with --sshlogin may fail\n");
|
||||
}
|
||||
|
||||
if(not defined $::opt_P) {
|
||||
|
|
@ -1265,19 +1266,19 @@ sub parse_sshlogin {
|
|||
# There are no remote hosts
|
||||
if(defined @::opt_trc) {
|
||||
print $Global::original_stderr
|
||||
"Warning: --trc ignored as there are no remote --sshlogin\n";
|
||||
"parallel: Warning: --trc ignored as there are no remote --sshlogin\n";
|
||||
} elsif (defined $::opt_transfer) {
|
||||
print $Global::original_stderr
|
||||
"Warning: --transfer ignored as there are no remote --sshlogin\n";
|
||||
"parallel: Warning: --transfer ignored as there are no remote --sshlogin\n";
|
||||
} elsif (defined @::opt_return) {
|
||||
print $Global::original_stderr
|
||||
"Warning: --return ignored as there are no remote --sshlogin\n";
|
||||
"parallel: Warning: --return ignored as there are no remote --sshlogin\n";
|
||||
} elsif (defined $::opt_cleanup) {
|
||||
print $Global::original_stderr
|
||||
"Warning: --cleanup ignored as there are no remote --sshlogin\n";
|
||||
"parallel: Warning: --cleanup ignored as there are no remote --sshlogin\n";
|
||||
} elsif (defined @::opt_basefile) {
|
||||
print $Global::original_stderr
|
||||
"Warning: --basefile ignored as there are no remote --sshlogin\n";
|
||||
"parallel: Warning: --basefile ignored as there are no remote --sshlogin\n";
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -1898,20 +1899,20 @@ sub processes_available_by_system_limit {
|
|||
# Give the user a warning. He can press Ctrl-C if this
|
||||
# sucks.
|
||||
print $Global::original_stderr
|
||||
("Warning: Starting 10 extra processes takes > 2 sec.\n",
|
||||
("parallel: Warning: Starting 10 extra processes takes > 2 sec.\n",
|
||||
"Consider adjusting -j. Press CTRL-C to stop.\n");
|
||||
$slow_spawining_warning_printed = 1;
|
||||
}
|
||||
}
|
||||
if($system_limit < $wanted_processes and not $more_filehandles) {
|
||||
print $Global::original_stderr
|
||||
("Warning: Only enough filehandles to run ",
|
||||
("parallel: Warning: Only enough filehandles to run ",
|
||||
$system_limit, " jobs in parallel. ",
|
||||
"Raising ulimit -n may help\n");
|
||||
}
|
||||
if($system_limit < $wanted_processes and $max_system_proc_reached) {
|
||||
print $Global::original_stderr
|
||||
("Warning: Only enough available processes to run ",
|
||||
("parallel: Warning: Only enough available processes to run ",
|
||||
$system_limit, " jobs in parallel.\n");
|
||||
}
|
||||
# Cleanup: Close the files
|
||||
|
|
@ -1948,7 +1949,7 @@ sub simultaneous_sshlogin_limit {
|
|||
if($ssh_limit < $wanted_processes) {
|
||||
my $serverlogin = $self->serverlogin();
|
||||
print $Global::original_stderr
|
||||
("Warning: ssh to $serverlogin only allows ",
|
||||
("parallel: Warning: ssh to $serverlogin only allows ",
|
||||
"for $ssh_limit simultaneous logins.\n",
|
||||
"You may raise this by changing ",
|
||||
"/etc/ssh/sshd_config:MaxStartup on $serverlogin\n",
|
||||
|
|
@ -2059,7 +2060,7 @@ sub ncpus {
|
|||
$self->{'ncpus'} = $ncpu;
|
||||
} else {
|
||||
print $Global::original_stderr
|
||||
("Warning: Could not figure out ",
|
||||
("parallel: Warning: Could not figure out ",
|
||||
"number of cpus on $serverlogin. Using 1\n");
|
||||
$self->{'ncpus'} = 1;
|
||||
}
|
||||
|
|
@ -2080,7 +2081,7 @@ sub no_of_cpus {
|
|||
if($no_of_cpus) {
|
||||
return $no_of_cpus;
|
||||
} else {
|
||||
warn("Cannot figure out number of cpus. Using 1");
|
||||
warn("parallel: Cannot figure out number of cpus. Using 1");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
|
@ -2097,7 +2098,7 @@ sub no_of_cores {
|
|||
if($no_of_cores) {
|
||||
return $no_of_cores;
|
||||
} else {
|
||||
warn("Cannot figure out number of CPU cores. Using 1");
|
||||
warn("parallel: Cannot figure out number of CPU cores. Using 1");
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
|
@ -2699,7 +2700,7 @@ sub sshtransfer {
|
|||
$pre .= "$mkremote_workdir; rsync $rsync_opt ".::shell_quote_scalar($file)." $serverlogin:$rsync_destdir;";
|
||||
} else {
|
||||
print $Global::original_stderr
|
||||
"Warning: $file is not readable and will not be transferred\n";
|
||||
"parallel: Warning: $file is not readable and will not be transferred\n";
|
||||
}
|
||||
}
|
||||
return $pre;
|
||||
|
|
@ -4017,6 +4018,6 @@ sub unlock {
|
|||
|
||||
# Keep perl -w happy
|
||||
|
||||
$::opt_regexp = $::opt_x = $::opt_workdir = $Semaphore::timeout = $Semaphore::wait =
|
||||
$::opt_x = $::opt_workdir = $Semaphore::timeout = $Semaphore::wait =
|
||||
$::opt_skip_first_line = $::opt_shebang = 0 ;
|
||||
|
||||
|
|
|
|||
|
|
@ -28,8 +28,7 @@ If you use B<xargs> today you will find GNU B<parallel> very easy to
|
|||
use as GNU B<parallel> is written to have the same options as
|
||||
B<xargs>. If you write loops in shell, you will find GNU B<parallel>
|
||||
may be able to replace most of the loops and make them run faster by
|
||||
running several jobs simultaneously. If you use B<ppss> or B<pexec> you
|
||||
will find GNU B<parallel> will often make the command easier to read.
|
||||
running several jobs simultaneously.
|
||||
|
||||
GNU B<parallel> makes sure output from the commands is the same output
|
||||
as you would get had you run the commands sequentially. This makes it
|
||||
|
|
@ -713,8 +712,8 @@ If B<--recstart> is given I<startstring> will be used to split at record start.
|
|||
If B<--recend> is given I<endstring> will be used to split at record end.
|
||||
|
||||
If both B<--recstart> and B<--recend> are given the string
|
||||
I<startregexp>I<endregexp> will have to match to find a split
|
||||
position. This is useful if either I<startregexp> or I<endregexp>
|
||||
I<startstring>I<endstring> will have to match to find a split
|
||||
position. This is useful if either I<startstring> or I<endstring>
|
||||
match in the middle of a record.
|
||||
|
||||
If neither B<--recstart> nor B<--recend> are given then B<--recend>
|
||||
|
|
@ -726,7 +725,7 @@ Use B<--regexp> to interpret B<--recstart> and B<--recend> as regular
|
|||
expressions. This is slow, however.
|
||||
|
||||
|
||||
=item B<--regexp> (unimplimented)
|
||||
=item B<--regexp> (beta test)
|
||||
|
||||
Use B<--regexp> to interpret B<--recstart> and B<--recend> as regular
|
||||
expressions. This is slow, however.
|
||||
|
|
@ -743,6 +742,7 @@ it to the command.
|
|||
|
||||
Only used with B<--pipe>.
|
||||
|
||||
|
||||
=item B<--retries> I<n> (beta testing)
|
||||
|
||||
If a job fails, retry it on another computer. Do this I<n> times. If
|
||||
|
|
@ -1601,6 +1601,34 @@ B<parallel -j 100 < jobs_to_run>
|
|||
As there is not a I<command> the jobs will be evaluated by the shell.
|
||||
|
||||
|
||||
=head1 EXAMPLE: Processing a big file using more cores
|
||||
|
||||
To process a big file or some output you can use B<--pipe> to split up
|
||||
the data into blocks and pipe the blocks into the processing program.
|
||||
|
||||
If the program is B<gzip -9> you can do:
|
||||
|
||||
B<cat bigfile | parallel --pipe --recend '' -k gzip -9 >>B<bigfile.gz>
|
||||
|
||||
This will split B<bigfile> into blocks of 1 MB and pass that to B<gzip
|
||||
-9> in parallel. One B<gzip> will be run per CPU core. The output of
|
||||
B<gzip -9> will be kept in order and saved to B<bigfile.gz>
|
||||
|
||||
B<gzip> works fine if the output is appended, but some processing does
|
||||
not work like that - for example sorting. For this GNU B<parallel> can
|
||||
put the output of each command into a file. This will sort a big file
|
||||
in parallel:
|
||||
|
||||
B<cat bigfile | parallel --pipe --files sort | parallel -Xj1 sort -m {} ';' rm {} >>B<bigfile.sort>
|
||||
|
||||
Here B<bigfile> is split into blocks of around 1MB, each block ending
|
||||
in '\n' (which is the default for B<--recend>). Each block is passed
|
||||
to B<sort> and the output from B<sort> is saved into files. These
|
||||
files are passed to the second B<parallel> that runs B<sort -m> on the
|
||||
files before it removes the files. The output is saved to
|
||||
B<bigfile.sort>.
|
||||
|
||||
|
||||
=head1 EXAMPLE: Working as mutex and counting semaphore
|
||||
|
||||
The command B<sem> is an alias for B<parallel --semaphore>.
|
||||
|
|
@ -1921,7 +1949,7 @@ variable $PARALLEL which takes precedence over the file
|
|||
|
||||
=head1 PROFILE FILES
|
||||
|
||||
If B<--profile> set, GNU B<parallel> will read the profile from that file instead of
|
||||
If B<--profile> set, GNU B<parallel> will read the profile from that file instead of
|
||||
~/.parallel/config.
|
||||
|
||||
Example: Profile for running every command with B<-j+0> and B<nice>
|
||||
|
|
|
|||
Loading…
Reference in a new issue