How to install gnu parallel on mac12/3/2022 ![]() The find command is an excellent gateway to Parallel as long as you're familiar with find and xargs (collectively called GNU Find Utilities, or findutils). What took 10 minutes before might take only 5 or 3 with Parallel. As old jobs are completed, it replaces them with new ones, until all the data provided to it has been processed. Parallel continues to do this for as long as it is safe to launch new jobs without crippling your computer. The result of this command is that find gathers all relevant files and hands them over to parallel, which launches a job and immediately requests the next in line. convert % %.png is the command you want to run in Parallel.Were you doing a more complex command that required two files (such as cat 001.txt 002.txt > new.txt), you would limit the rate to 2. Since the command Parallel is running requires only one file, you limit the rate to 1. -max-args 1 limits the rate at which Parallel requests a new object from the queue.You use this because otherwise you'd have to manually write a new command for each result of find, and that's exactly what you're trying to avoid. -I% creates a placeholder, called %, to stand in for whatever find hands over to Parallel.name "*jpeg" finds all files in the current directory that end in jpeg. This is a combination of two commands: the find command, which gathers the objects you want to operate on, and the parallel command, which sorts through the objects and makes sure everything gets processed as required. name "*jpeg" | parallel -I% -max-args 1 convert % %.png My iMac (OSX MAvericks on Intel core i7) gives the following, which all looks correct: sysctl -n hw.physicalcpu ![]() parallel on the remote server is in /home/u/user/bin/parallel: PATH=$PATH:/home/u/user/bin parallel -env PATH -S echo running on ::: for Ole Which version of GNU Parallel are you using?Īs a work around you can force GNU Parallel to detect 16 cores: parallel -S echo running on ::: version 20140422 you have been able to export your path to the remote server: parallel -env PATH -S echo running on ::: way you just need to add the dir where parallel lives on the server to your path on local machine. Sysctl -a hw 2>/dev/null | grep physicalcpu | awk ''Ĭan you test what output you get from those? ![]() GNU Parallel has since 20120322 used these to find the number of CPUs: sysctl -n hw.physicalcpu ![]() ![]() GNU Parallel is less tested on OS X as I do not have access to an OS X installation, so you have likely found a bug. ![]()
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