Sybase 15.0.2 - Manual (Page 40)

Pre-installation tasks for Adaptive Server
26 Adaptive Server Enterprise
Adaptive Server may allocate shared memory segments after start-up if
any reconfiguration through
sp_configure requires additional memory. You
may need to account for these additional segments. Allocate the maximum
memory you will make available to Adaptive Server, by using the
allocate
max shared memory configuration parameter. See the System
Administration Guide for more information.
16
17 To optimize asynchronous I/O and to prevent the paging of shared
memory, you must grant MLOCK permissions before you install Adaptive
Server.
To grant MLOCK permissions to a group, enter:
/etc/privgrp add mlock <group name>
or:
/etc/setprivgrp <group name> MLOCK
18
If after adjusting the SHMMAX parameter the server fails to reboot you may
also need to increase the value of another Kernel parameter, SHMALL, which
is the maximum amount of shared memory that can be allocated. Its value is in
the file /proc/sys/kernel/shmall. This task requires root permission.