Caché Installation Guide - InterSystems Documentation

Installing Caché on Mac
3. Follow the instructions in the Run the Installation Script section and subsequent sections of the
“Installing Caché on UNIX and Linux” chapter of this guide.
5.3.1 Adjustments for Large Number of Concurrent Processes
Make the following adjustments if you are running a system that requires a large number of processes
or telnet logins:
1. Remote connections — The number of pty (pseudo terminal) connections is limited to 128 systemwide.
This is a hard, non-expandable limit. If your applications count on telnet or other pty-using
connections for users to access, keep this in mind.
2. Number of processes — If the pty limit is not a problem, but you need to run a larger number of
processes, there are limits to that as well.
• System-wide process limits — The kern.maxproc, kern.maxprocperuid parameters are set to
532 and 100 by default. You can change them using the following commands:
administrator$ sudo sysctl -w kern.maxproc=2500
kern.maxproc: 2065 -> 2500
administrator$ sudo sysctl -w kern.maxprocperuid=2500
kern.maxprocperuid: 2000 -> 2500
administrator$ sysctl -a | grep maxproc
kern.maxproc = 2500
kern.maxprocperuid = 2500
Note, however, that 2500 is the absolute unchangeable upper limit.
• Process family limit — On Mac OS X 10.4, an additional maxproc limit on the number of
descendants of a shell is set to 100. You can change it with the ulimit command. For example:
prod1:~ root# ulimit -u unlimited
prod1:~ root# ulimit -a
...
max user processes (-u) 2068
This parameter has a hard limit of 2068. Use the ulimit command with bash and the limit
command with csh.
Note: The process family limit does not apply to Mac OS X 10.5.
5.3.2 Using FileVault
FileVault is a Mac OS X optional feature that encrypts the entire contents of your home directory.
Due to the nature of Mac OS X FileVault, the setuid and setgid executables do not actually change
the effective user ID and group ID of the executable. The result is that in a FileVault Caché installation,
many files are left with root as owner.
64 Caché Installation Guide