MACPORT IN : how to installation using multiple instances on – OSX –
MACPORT: whenever i try to install multiple packages in macport at once, i do get following.
sudo port install swi-prolog
Waiting for lock on /opt/local/var/macports/registry/.registry.lock
It asks me to wait until current package installation is completed. How can i run multiple instance of macport to install various packages parallely, so that i will not have to wait till one gets installed. is there any workaround?
By design, MacPorts uses a single lock file (/opt/local/var/macports/registry/.registry.lock) to prevent multiple processes from modifying the package registry simultaneously. This prevents potential conflicts and data corruption. However, there are a few ways to work around this limitation and install multiple packages in MacPorts concurrently:
Use Multiple Terminal Windows: Open multiple terminal windows or tabs and run separate sudo port install commands in each window to install different packages. Since each terminal window operates independently, the installations can proceed concurrently.
Background the Installations: You can run the sudo port install commands in the background by appending an ampersand (&) at the end of each command. This will allow each installation to run in the background concurrently.
Example:
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<code>sudo port install package1 & sudo port install package2 & sudo port install package3 &</code>
Use GNU Parallel: If you have GNU Parallel installed on your system (can be installed via Homebrew), you can use it to execute multiple commands concurrently.
Example:
yaml
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<code>parallel sudo port install ::: package1 package2 package3</code>
MacPorts Parallel Mode: MacPorts has a parallel mode (-j option) that allows you to specify the number of concurrent jobs. However, this mode applies only to building packages from source, not the initial installation. Additionally, it might cause resource contention and slow down installations on systems with limited resources.
Example (for building from source):
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<code>sudo port -j 4 install package1 package2 package3</code>
Remember that concurrent installations can put a significant load on your system’s resources, such as CPU and memory. If your system has limited resources, it’s essential to be cautious and monitor the installation processes to avoid performance issues.
Please note that while the above methods can help run multiple installations concurrently, you should still be aware of potential dependencies between packages. If packages have interdependencies, running concurrent installations might cause conflicts or errors. It’s advisable to understand the package dependencies and ensure that installations are performed in an appropriate order or use the -s option with port install to install dependencies sequentially.