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GNU parallel is a shell tool for executing jobs in parallel locally or using remote computers. A job is typically a single command or a small script that has to be run for each of the lines in the input. The typical input is a list of files, a list of hosts, a list of users, a list of URLs, or a list of tables. If you use xargs today you will find GNU parallel very easy to use, as GNU parallel is written to have the same options as xargs. If you write loops in shell, you will find GNU parallel may be able to replace most of the loops and make them run faster by running several jobs in parallel. GNU parallel makes sure output from the commands is the same output as you would get had you run the commands sequentially. This makes it possible to use output from GNU parallel as input for other programs.

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2011-11-23 07:25
20111122 ('Silvio')

这是一个修复错误版本没有的新特色。它可能是一个很好的释放稳定长期使用。
This is a bugfix release with no new features. It is probably a good release for stable long-term use.

2011-10-24 05:50
20111022

--tag prepends lines with the argument(s). If used with --(n)onall, the line will be prepended with the sshlogin instead. --shellquote does not run the command, but quotes it using \'s, which is useful for making quoted composed commands. --profile can now be repeated, merging multiple profiles. --bibtex now gives the BibTeX entry. A makefile for a simple .deb package: cd packager/debian; make. sql: --list-databases lists the databases.

2011-08-22 09:45
20110822 ('Utøya')

- 超时选项已经实施，使较慢的命令可以被杀死。 CPU检测得到了提高，为Mac OS X有一个在手册页的并行Web爬虫的例子。
A --timeout option has been implemented so that slow commands can be killed. CPU detection has been improved for Mac OS X. There is an example of a parallel Web crawler in the man page.

2011-07-22 19:33
20110722

- niceload硬盘选项将暂停一个程序，如果达到极限，而 - 软程序将缓慢下降，和 - 运行- IO会减慢程序的磁盘IO，如果超过一定限度。 - 运行负荷将放慢一个程序，如果loadaverage超过一定限度。 - 运行- MEM将放慢一个程序，如果可用内存低于一定的限度。 - 运行noswap将放慢一个程序，如果计算机交换。 - 启动IO - 启动负载， - 开始- MEM - 启动noswap将推迟启动程序，直到系统的限制之下。 - 木卫一， - 负载 - MEM，和 - noswap同时设置 - 运行- *和 - 启动*.
The --hard option of niceload will suspend a program if a limit is reached, while --soft will slow the program down, and --run-io will slow down a program if disk IO goes above a certain limit. --run-load will slow down a program if loadaverage goes above a certain limit. --run-mem will slow down a program if free memory goes below a certain limit. --run-noswap will slow down a program if the computer is swapping. --start-io, --start-load, --start-mem, and --start-noswap will defer starting a program until the system is below the limit. --io, --load, --mem, and --noswap sets both --run-* and --start-*.

2011-06-22 18:36
20110622

- onall将所有计算机上运行的所有工作。这对于拥有多台服务器系统管理员非常有用。 - nonall运行一样 - onall但是从标准输入读取任何参数，所以它是可以做到的“平行 - nonall - S计算机1，计算机2正常运行时间”。现在可以更换背景与多个输入源：“平行- X回声{1} - {2}：：：1 2 3：：：ABC - noswap”不启动的服务器上的交换工作。
--onall will run all the jobs on all the computers. This is useful for system administrators having multiple servers. --nonall runs like --onall but reads no arguments from standard input, so it is possible to do "parallel --nonall -S computer1,computer2 uptime". Context replacement now works with multiple input sources: "parallel -X echo {1}-{2} ::: 1 2 3 ::: a b c --noswap" does not start a job on a server that is swapping.

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