Caché Installation Guide - InterSystems Documentation

Calculating System Parameters for UNIX and Linux
The following Web site details other ZIL specific commands: http://blogs.sun.com/perrin/entry/slog_blog_or_blogging_on
Miscellaneous Solaris Settings
If a driver encounters a request larger than the maximum size of physical I/O requests (maxphys), it
breaks the request into maxphys-size chunks. This value does not need to be specified on Solaris
SPARC implementations, but it should be explicitly configured on Solaris x64 systems.
To configure the maximum size of physical I/O requests, add the following line to the /etc/system file:
set maxphys=1048576
B.2.3.6 SUSE Linux Platform Notes
This topic includes the information on the following adjustments:
• Shared Memory Limits
• Locked-in Memory
Shared Memory Limits
The default shared memory limits (shhmax and shmall) on SUSE Linux 32-bit platforms are too small
for Caché, and can be changed in the proc file system without a restart.
Note: The recommendations to change the shared memory limits do not apply to SUSE Linux 64-
bit systems.
If the machine is being used only for Caché, InterSystems recommends setting the shared memory to
approximately half the total memory.
For example, to allow 512 MB, type the following commands:
#sets shmall and shmmax shared memory
echo 536870912 >/proc/sys/kernel/shmall
echo 536870912 >/proc/sys/kernel/shmmax
#Sets shmall to 512 MB
#Sets shmmax to 512 MB
You can put these commands into a script that is run at startup. The SUSE Linux product documentation
recommends you put the commands in the /etc/init.d/boot.local script file.
You can change the settings for the system memory user limits by modifying a file called
/etc/profile.local. Add lines similar to the following:
#sets user limits (ulimit) for system memory resources
ulimit -v 512000 #set virtual (swap) memory to 512 MB
ulimit -m 512000 #set physical memory to 512 MB
In this same file, you can permanently change the values for the PATH and CLASSPATH parameters
by adding lines similar to the following:
102 Caché Installation Guide