IBM pSeries manual Contents

Contents
1.0 Introduction		4
2.0 Tunables and settings for switch software		5
2.1	MPI tunables for Parallel Environment	5
2.1.1 MP_EAGER_LIMIT		5
2.1.2 MP_POLLING_INTERVAL and MP_RETRANSMIT_INTERVAL		5
2.1.3 MP_REXMIT_BUF_SIZE and MP_REXMIT_BUF_CNT		6
2.1.4 MEMORY_AFFINITY		6
2.1.5 MP_TASK_AFFINITY		7
2.1.6 MP_CSS_INTERRUPT		7
2.2	MPI-IO	7
2.3 chgsni command		8
3.0 Tunables and settings for AIX 5L		9
3.1	IP tunables	9
3.2	File cache	9
3.3 svmon and vmstat commands		10
3.3.1 svmon		11
3.3.2 vmstat		12
3.4	Large page sizing	13
3.5	Large pages and IP support	15
3.6	Memory affinity for a single LPAR	15
3.7	Amount of memory available	15
3.8	Debug settings in the AIX 5L kernel	16
4.0 Daemon configuration		16
4.1 RSCT daemons		16
4.2	LoadLeveler daemons	17
4.2.1 Reducing the number of daemons running		17
4.2.2 Reducing daemon communication and placing daemons on a switch 17
4.2.3 Reducing logging		17
4.3	Settings for AIX 5L threads	18
4.4	AIX 5L mail, spool, and sync daemons	18
4.5	Placement of POE managers and LoadLeveler scheduler	18
5.0 Debug settings and data collection tools		19
5.1 lsattr tuning		19
5.1.1 driver_debug setting		19
5.1.2 ip_trc_lvl setting		19
5.2	CPUs and frequency	19
5.3	Affinity LPARs	20
5.4	Small Real Mode Address Region on HMC GUI	20
5.5	Deconfigured L3 cache	20
5.6	Service focal point	20
5.7 errpt command		21
5.8	HMC error logging	21
5.9	Multiple versions of MPI libraries	21
pshpstuningguidewp040105.doc		Page 2