How to Change Open Files Limit on OS X and macOS
This text is the section about OS X Yosemite (which also works for macOS Sierra) from https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/#mac-os-x
The last time i visited this link it was dead (403), so I cloned it here from the latest snapshot in Archive.org's Wayback Machine https://web.archive.org/web/20170523131633/https://docs.basho.com/riak/kv/2.1.4/using/performance/open-files-limit/
Mac OS X
To check the current limits on your Mac OS X system, run:
launchctl limit maxfiles
The last two columns are the soft and hard limits, respectively.
Adjusting Open File Limits in Yosemite
To adjust open files limits on a system-wide basis in Mac OS X Yosemite, you must create two configuration files. The first is a property list (aka plist) file in
/Library/LaunchDaemons/limit.maxfiles.plist that contains the following XML configuration:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>limit.maxfiles</string> <key>ProgramArguments</key> <array> <string>launchctl</string> <string>limit</string> <string>maxfiles</string> <string>200000</string> <string>200000</string> </array> <key>RunAtLoad</key> <true/> <key>ServiceIPC</key> <false/> </dict> </plist>
This will set the open files limit to 200000. The second plist configuration file should be stored in
/Library/LaunchDaemons/limit.maxproc.plist with the following contents:
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple/DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>Label</key> <string>limit.maxproc</string> <key>ProgramArguments</key> <array> <string>launchctl</string> <string>limit</string> <string>maxproc</string> <string>2048</string> <string>2048</string> </array> <key>RunAtLoad</key> <true /> <key>ServiceIPC</key> <false /> </dict> </plist>
Both plist files must be owned by root:wheel and have permissions -rw-r--r--. This permissions should be in place by default, but you can ensure that they are in place by running sudo chmod 644 . While the steps explained above will cause system-wide open file limits to be correctly set upon restart, you can apply them manually by running launchctl limit.
In addition to setting these limits at the system level, we recommend setting the at the session level as well by appending the following lines to your bashrc, bashprofile, or analogous file:
ulimit -n 200000 ulimit -u 2048
Like the plist files, your bashrc or similar file should have -rw-r--r-- permissions. At this point, you can restart your computer and enter
ulimit -n into your terminal. If your system is configured correctly, you should see that maxfiles has been set to 200000.
How I modified limits for my 2013 Macbook air (running sierra): run
sysctl -a | grep kern.maxfiles this may show you:
kern.maxfiles: 12288 kern.maxfilesperproc: 10240
I would presume this might be the kernels max capacity (probably guesstimated by apple, but still, I have to respect apple's settings). This seems like a fair max limit given my minimal research on this issue. For a soft limit, I think subtracting 2048 seems fair also. I'm no expert on this stuff, but maybe it sounds reasonable to you too.
12288-2048=10240 (soft limit) (Oh hey what do you know - this is the same number as the
The gist this was forked from set the macproc to 2048 which is lower than my current default 10240, so I'm not going to modify that for now.
My default max limit is acually
unlimited right now when I run
launchctl limit maxfiles but I'm going to err on the side of sticking to the instructions provided from basho.
If you get this error
ulimit: setrlimit failed: invalid argument when trying to run
ulimit - n 12288 in your shell/bash_profile?bashrc/zshrc, you need to include the second paramter for the hard limit, so I did
ulimit -n 10240 12288 and this worked for me