scored(8)
from within a
scout(1)
environment. scored fork()'s and
exec()'s user
processes, so scored must run as root so it can set
the user ID of user processes. Here is a very simple example of starting
a Multi-User Environment for the cluster group 'pcc', which
consists of four compute hosts, comp0, comp1,
comp2 and comp3. The
scoreboard(8)
is executing on host 'serv1' so we need to set the
SCBDSERV environment variable:
The startup of$ /bin/su - # export SCBDSERV=serv1 # export PATH=$PATH:/opt/score/bin:/opt/score/sbin:/opt/score/deploy # scout -g pcc SCOUT: Spawn done. SCOUT: session started # scored SYSLOG: /opt/score/deploy/scored SYSLOG: SCore-D 4.1 $Id: init.cc,v 1.63 2001/09/07 09:10:26 hori Exp $ SYSLOG: Compile option(s): SYSLOG: SCore-D network: myrinet/myrinet2k SYSLOG: Cluster[0]: (0..15)x2.i386-redhat7-linux2_4.i686.800 SYSLOG: Memory: 501[MB], Swap: 259[MB], Disk: 3027[MB] SYSLOG: Network[0]: myrinet/myrinet2k SYSLOG: Network[1]: ethernet/ethernet SYSLOG: Scheduler initiated: Timeslice = 500 [msec] SYSLOG: Queue[0] activated, exclusive scheduling SYSLOG: Queue[1] activated, time-sharing scheduling SYSLOG: Queue[2] activated, time-sharing scheduling SYSLOG: Session ID: 0 SYSLOG: Server Host: comp00.pccluster.org SYSLOG: Backup Host: comp0f.pccluster.org SYSLOG: Operated by: hori SYSLOG: --------- SCore-D (4.1) bootup --------
scored will take several seconds to
complete, depending on the number of host involved.
If you are already executing the Compute Host Lock Client,
msgb(1), then
you will see the node blocks in the msgb window change from
blue to red.
In this case,
there is one cluster designated as Cluster[0] consisting of 16
hosts. comp00.pccluster.org is host 0, running to
comp0f.pccluster.org as host 15. The acceptable binary
type is i386-redhat7-linux2_4, the CPU generation name is
i686, and its speed is 800 (MHz). the binary type
i386-redhat7-linux2_4 means that processor is Intel
i386, OS distributer is Redhat (version 7.X) and the kernel version is
Linux 2.4.X.
Each host in the cluster is an SMP (SMP is set to
2 in this case). The processor speed is 800.
This could mean 800 MHz but it is chosen at the administrator's
discretion.
There is one Myrinet2000 network designated as Network[0]
and Ethernet as Network[1]. The
default network for SCore-D can be any of these networks specified
with the -network option. In this case, Myrinet2000 is
chosen in default. If there
were multiple networks then the default network will be the first network in
the list. The SCore-D server is, by default, the last host in the cluster,
in this case, comp0f.pccluster.org.
scored is now running on the cluster group and users can submit
jobs to be executed on the cluster using commands such as
scrun(1) or
mpirun(1).
User's program executable files are copied by scored to the
compute hosts. The files do not need to be located in a network file
system, however, user executable files must be readable for the
copy to take place. Users executable files are copied into somewhere
in the /var/scored directory.
A checkpoint image is also stored in this
directory if the user program requests to be checkpointed.
The directory must be located in a file system where there is
enough disk space to hold those files. The directory may be
created when scored is firstly invoked on the cluster hosts. If
the system administrator wants to have the directory in another file
system, then the administrator must create a symbolic link before
scored is run. User files in this directory will be removed
when a parallel process is terminated.
There are several options available for scored. You can read the
scored(8)
man page for complete details.