Tuning measures

The following table contains measures that are recommended for enhancing the POSIX performance.

Measure

Comments

Using the POSIX loader posdbl

A 30 MB memory pool is recommended (DBLPOOL parameter in the information file)

Note:
The PAGING AREA must be capable of accepting this additional address space.

For program production:
Compiler call is explicitly included in posdbl using posdbl -b /usr/bin/c89 or posdbl -b /usr/bin/cc

Using current subsystems

The following subsystems should be started for the shell commands and for executing user programs:

For CRTE:	CRTEC CRTEPART
For CRTE-BASYS:	CRTEBASY
For using EDT:	EDT EDTU EDTCON
For program production:	BINDER PMLOG CPP

Using DAB

The following files should be held in the cache:

SYS.AIDIT0 (approx. 30 PAM pages): cache completely

Using the private POSIX loader pdbl

see "POSIX Commands" [1] manual

Increasing control parameters in the POSIX information file (see "POSIX information file")

In event of high I/O load: HDSTNI
	Number of server tasks for performing asynchronous I/Os
NPBUF
	Maximum number of I/O buffers for physical I/Os. This value should be at least 4 * HDSTNI.