コンピュータやモバイルデバイスでサーバのサービスを受けるユーザに対してサーバの応答性を高める一方で、サーバ上のアプリケーションを使用するときは応答性を低くすることができます。
Lion Server：「システムリソースをサーバのサービスに専属的に割り当てる」設定に関する追加情報 - Apple サポート
このオプションを有効にすると、rc.server コマンドスクリプトが読み込まれ、システムでサーバのパフォーマンスが向上するよう調整されます。
appを使うにしてもサーバ優先で運用したいから、これは有効にすべきでしょうね。
man rc.serverした。
RC.SERVER(8) BSD System Manager's Manual RC.SERVER(8)
NAME
rc.server -- server-specific boot initializations
SYNOPSIS
rc.server
DESCRIPTION
rc.server is the server-specific command script invoked by launchd(8) to
tune system parameters before system processeses are started.
launchd guarantees that rc.server is run before services are bootstrapped
so that resource limits are inherited by all system processes. There-
fore, actions in this script only have read access to the root filesystem
and logging facilities are not available. Output is directed to the sys-
tem console and may be viewed using verbose boot.
This script and specific resource settings may change at any time, such
as by hardware reconfiguration or software updates. System specific
overrides should be done in sysctl.conf(5), launchd.conf(5), or service
specific launchd.plist(5) configuration files.
The following sysctl(8) settings are among those that may be tuned by
this script:
kern.ipc.somaxconn
kern.maxproc
kern.maxnbuf
kern.maxvnodes
kern.maxfiles
kern.maxprocperuid
net.inet.tcp.delayed_ack
rc.server will only be executed to tune the system if it is determined to
be a server configuration.
FILES
/etc/rc.server
DIAGNOSTICS
Since rc.server is invoked before system logging is available, diagnostic
output is only available to console during verbose boot.
SEE ALSO
launchd.conf(5), launchd.plist(5), sysctl.conf(5), launchd(8), sysctl(8),
rc(8)
BUGS
The rc.server script is currently run after sysctl.conf is executed and
the root file system is mounted read-write.
Mac OS X Server June 28, 2009 Mac OS X Server
