Caché Installation Guide - InterSystems Documentation

Determine Memory and Disk Requirements
B.1.2 Calculate Swap Space
The amount of swap space available on your system should never be less than the amount of
real memory plus 256 KB.
With this minimum in mind, InterSystems recommends the following value as the minimum
amount of swap space needed for Caché:
((# of processes + 4)† * (1024 KB)‡
+ total global buffer space
+ total routine buffer space
_____________________________________
= Minimum swap space
† You add 4 to the # of processes for the Caché Control Process, the Write daemon, the
Garbage Collector, and the Journal daemon. You should also add 1 for each slave Write
daemon. The # of processes must include all user and jobbed processes which might run
concurrently. If you are running networking, add 1 for the RECEIVE system process plus
the number of DMNNET daemons you have running (2 per port). If your system is a server,
add the number of DCP processes that will be created when all potential clients access the
server.
‡ The 1024 KB number is approximate. It is based on the current size of the Caché executable
and grows with the partition size you allocate to each Caché process. On most systems, provide
only as much swap space as necessary. However, some systems require you to provide swap
space for the worst case. Under these conditions, you need to increase this number to as high
as 1.5 MB, depending on the partition size you specify.
Be sure to confirm that your UNIX system permits the amount of swap space you require.
For specific information about swap space on your system, consult your UNIX operating
system manual.
B.1.2.1 Solaris Swap Space
To calculate swap space for the Solaris 9 platform:
swap –l
Example:
>swap –l
swapfile dev swaplo blocks free
/dev/dsk/c0t2d0s0 136,0 16 526304 526304
/dev/dsk/c0t2d0s1 136,1 16 2101184 2101184
Caché Installation Guide 71