8.2. Configuration

The values in the flat files in the /proc/hpc/admin directory presenting the current configuration of the cluster. Also the administrator can write its own values into these files to change the configuration during runtime, e.g.

Table 8-1. Changing /proc/hpc parameters

echo 1 > /proc/hpc/admin/block	blocks the arrival of remote processes
echo 1 > /proc/hpc/admin/bring	bring all migrated processes home

...

Table 8-2. /proc/hpc/admin/

(binary files)	config	the main configuration file (written by the setpe util)
(flat files)	block	allow/forbid arrival of remote processes
	bring	bring home all migrated processes
	dfsalinks	list of current symbolic dfsa-links
	expel	sending guest processes home
	gateways	maximum number of gateways
	lstay	local processes should stay
	mospe	contains the openMosix node id
	nomfs	disables/enables MFS
	overheads	for tuning
	quiet	stop collecting load-load-balancing informations
	decay-interval	interval for collecting informations about load-balancing
	slow-decay	default 975
	fast-decay	default 926
	speed	speed relative to PIII/1GHz)
	stay	enables/disables automatic process migration

Table 8-3. Writing a 1 to the following files /proc/hpc/decay/

clear	clears the decay statistics
cpujob	tells openMosix that the process is cpu-bound
iojob	tells openMosix that the process is io-bound
slow	tells openMosix to decay its statistics slow
fast	tells openMosix to decay its statistics fast

Table 8-4. Informations about the other nodes

/proc/hpc/nodes/[openMosix_ID]/CPUs	how many CPU's the node has
/proc/hpc/nodes/[openMosix_ID]/load	the openMosix load of this node
/proc/hpc/nodes/[openMosix_ID]/mem	available memory as openMosix believes
/proc/hpc/nodes/[openMosix_ID]/rmem	available memory as Linux believes
/proc/hpc/nodes/[openMosix_ID]/speed	speed of the node relative to PIII/1GHz
/proc/hpc/nodes/[openMosix_ID]/status	status of the node
/proc/hpc/nodes/[openMosix_ID]/tmem	available memory
/proc/hpc/nodes/[openMosix_ID]/util	utilization of the node

Table 8-5. Additional Informations about local processes

/proc/[PID]/cantmove	reason why a process cannot be migrated
/proc/[PID]/goto	to which node the process should migrate
/proc/[PID]/lock	if a process is locked to its home node
/proc/[PID]/nmigs	how many times the process migrated
/proc/[PID]/where	where the process is currently being computed
/proc/[PID]/migrate	same as goto remote processes
/proc/hpc/remote/from	the home node of the process
/proc/hpc/remote/identity	additional informations about the process
/proc/hpc/remote/statm	memory statistic of the process
/proc/hpc/remote/stats	cpu statistics of the process