Autotuning

SCO OpenServer Release 5.0.6 and later releases attempt to autotune parameters that control the disk buffer cache, STREAMS, and paging to better utilize the larger hardware configurations that are increasingly common. This autotuning only affects systems with more than 64MB of memory at installation time. If you upgrade memory after installation or are running SCO OpenServer Release 5.0.5 or earlier, use idtune(ADM) with the -m option to set these parameters:

Parameter	>=1GB	>=256MB	>=128MB	>=64MB
GPGSLO	2000	1000	600	200
GPGSHI	6000	3000	1500	600
PLOWBUFS	1024	1024	1024	1024
NSTRPAGES	6000	4000	2000	1000

For systems configured with at least 48MB of RAM at installation time, SCO OpenServer Release 5.0.6 and later releases autotune kernel parameters to values that optimize database performance. If you upgrade memory after installation or are running SCO OpenServer Release 5.0.5 or earlier, use configure(ADM) to set these parameters:

Parameter	Value	Parameter	Value	Parameter	Value
NAIOPROC	50	NHINOD	1024	SEMMNS	8192
NAIOREQ	400	NSTREAM	4352	SEMMSL	150
NAIOBUF	400	NSTREVENT	8704	SEMMNU	100
NAIOHBUF	100	NUMSP	256	SHMMAX	2147483647
NAIOREQPP	400	NUMTIM	1104	SHMMIN	1
NAIOLOCKTBL	50	NUMTRW	1104	SHMALL	512
MAX_PROC	10000	SDSKOUT	64	SHMMNI	100
MAXUMEM	1048576	SEMMAP	8192	SHMSEG	6
NCALL	256	SEMMNI	8192	TTHOG	4096
NCLIST	512