Skip to content This hack changes the game into something completely different. Continue Reading. Conker's High Rule Tail - Zelda 1. Zelda3 Parallel Remodel 1. Zelda: Parallel Worlds 1. The Legend of Zelda: Goddess of Wisdom 0. It does that using rsync. Some jobs need a common database for all jobs. GNU parallel can transfer that using --basefile which will transfer the file before the first job:. The default working dir on the remote machines is the login dir.
This can be changed with --workdir mydir. Files transferred using --transferfile and --return will be relative to mydir on remote computers, and the command will be executed in the dir mydir. The special mydir value If --cleanup is given these dirs will be removed.
The special mydir value. If the current working dir is beneath your home dir, the value. This means that if your home dir is different on remote computers e. If many jobs are started on the same server, sshd can be overloaded. GNU parallel can insert a delay between each job run on the same server:. In clusters with many hosts a few of them are often down. GNU parallel can ignore those hosts. In this case the host Often you will just want to run a single command on all hosts with out arguments.
When --tag is used with --nonall and --onall the --tagstring is the host:. You active it by running:. GNU parallel can copy all user defined variables and functions to the remote system. Do that by running this once:. When using --cat , --pipepart , or when a job is run on a remote machine, the command is wrapped with helper scripts.
When the command gets more complex, the output is so hard to read, that it is only useful for debugging:. GNU parset has one important limitation: It cannot be part of a pipe. In particular this means it cannot read anything from standard input stdin or pipe output to another program. Point GNU parallel to a table and it will put the joblog there together with the variables and the output each in their own column. The first columns are well known from --joblog.
V1 and V2 are data from the input sources. Stdout and Stderr are standard output and standard error, respectively. You can then have a single master machine that submits jobs to the SQL base but does not do any of the work :.
On the worker machines you run exactly the same command except you replace --sqlmaster with --sqlworker. To run a master and a worker on the same machine use --sqlandworker as shown earlier. The --pipe functionality puts GNU parallel in a different mode: Instead of treating the data on stdin standard input as arguments for a command to run, the data will be sent to stdin standard input of the command.
Then start another instance, read another chunk, and pass that to the second instance. The size of the chunk is not exactly 1 MB because GNU parallel only passes full lines - never half a line, thus the blocksize is only 1 MB on average. You can change the block size to 2 MB with --block :. GNU parallel treats each line as a record. If the order of records is unimportant e.
Without --roundrobin GNU parallel will start a command per block; with --roundrobin only the requested number of jobs will be started --jobs. The records will then be distributed between the running jobs:. One of the 4 instances got a single record, 2 instances got 2 full records each, and one instance got 1 full and 1 partial record.
Using -N GNU parallel will read records at a time:. Note how GNU parallel still reads a block of around 1 MB; but instead of passing full lines to wc it passes full 75 lines at a time. This of course does not hold for the last job which in this case got 25 lines. The default is --recend 'n' newline. If both --recend and --recstart are given, then the record will only split if the recend string is immediately followed by the recstart string. Stack Overflow for Teams — Collaborate and share knowledge with a private group.
Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Parallel downloading Ask Question. Asked 10 years, 4 months ago. Active 5 years, 9 months ago. Viewed 3k times. Improve this question. Davide Piras What approaches have you tried? Post some code, please. NET 4? Lack of detail makes this a hard question to answer. This entry was posted in C. Bookmark the permalink. Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:.
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