CPU(4)CPU(4)NAMEcpu - cpu server resource
SYNOPSIS
grid/srv/cpu
grid/runcpu
DESCRIPTION
Cpu is a file server that provides a processing resource. This resource
imports a namespace from one or more external sources and executes
selected commands within it. Cpu creates its own namespace containing
three files ctl, cmd and ns which are used to configure the processing
task prior to execution, this namespace is exported and served on
stdin. In order to configure a processing task, a client must first
mount the cpu namespace. Once this is done, reading the cmd and ns
files will display the current configuration of commands to be executed
or directories to be imported respectively. The ctl file is used to
modify the current configuration and accepts the following input:
add cmd command
add ns path address
del [cmd|ns] index
Where command is the name (including full path and parameters) of a
command to be executed. Path is the name of a directory to import from
the exported namespace available at address and index is the index (as
shown when reading the cmd and ns files) of the command or directory to
be removed from the configuration.
For example, to import /dis and /dev from a resource exporting a Styx
(see intro(5)) namespace at address tcp!200.1.5.53!7003 and then run ls
-l and du, the following commands would be used:
echo 'add cmd /dis/ls -l' > ctl
echo 'add cmd /dis/du' > ctl
echo 'add ns /dis tcp!200.1.5.53!7003' > ctl
echo 'add ns /dev tcp!200.1.5.53!7003' > ctl
Reading the cmd and ns files will give the following output:
cmd
1: /dis/ls -l
2: /dis/du
ns
1: /dis (200.1.5.53!7003)
2: /dis (200.1.5.53!7003)
Once the client disconnects from (unmounts) the cpu, the selected
namespaces will be imported and the commands executed. Note: A cpu does
not have any namespace of its own. All required namespaces must be
imported, for a simple command such as ls, the minimum recommended
namespace to import would be: /chan /dev /dis /module
Register(1) may be used in conjunction with cpu to register it with a
registry(4) and to export and serve its namespace across dial(2) net‐
work connections. Incoming connections may also be displayed visually
using monitor(1). For example:
grid/register [ options ... ] { grid/srv/cpu } | grid/srv/monitor 2
'CPU resource'
This set of commands is encapsulated within the shell script runcpu
which will automatically register cpu with a registry(4) if possible
and start up the graphical display to show connections to the resource.
There is no need for the user to execute cpu outside of runcpu unless
the namespace it provides is required to be accessible in a different
way to that provided by register(1).
SOURCE
/appl/grid/srv/cpu.b
BUGS
At the moment, Cpu will only import namespaces across an unauthenti‐
cated connection as provided by ns(1).
SEE ALSOmonitor(1), ns(1), register(1), session(1)CPU(4)