.TH CPU 4.SH NAMEcpu \- cpu server resource.SH SYNOPSIS.B grid/srv/cpu.br.B grid/runcpu.SH DESCRIPTION.I Cpuis 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. .I Cpucreates its own namespace containing three files.BR ctl ,.B cmdand.B nswhich are used to configure the processing task prior to execution, this namespace is exported and served on .I stdin.In order to configure a processing task, a client must first mount the.I cpunamespace. Once this is done, reading the .B cmdand.B nsfiles will display the current configuration of commands to be executed or directories to be imported respectively. The .B ctlfile is used to modify the current configuration and accepts the following input:.IP.B add cmd .I command.IP.B add ns .I path address.IP.B del [cmd|ns].I index.PPWhere.I commandis the name (including full path and parameters) of a command to be executed..I Pathis the name of a directory to import from the exported namespace available at .I addressand .I indexis the index (as shown when reading the.B cmdand.B nsfiles) of the command or directory to be removed from the configuration..PPFor example, to import.B /disand.B /devfrom a resource exporting a Styx (see.IR intro(5))namespace at address.B tcp!200.1.5.53!7003and then run .B ls -l and.BR du ,the following commands would be used:.IP.B "echo 'add cmd /dis/ls -l' > ctl".br.B "echo 'add cmd /dis/du' > ctl".br.B "echo 'add ns /dis tcp!200.1.5.53!7003' > ctl".br.B "echo 'add ns /dev tcp!200.1.5.53!7003' > ctl".PPReading the.B cmdand .B nsfiles will give the following output:.IP.B cmd.br.B 1: /dis/ls -l.br.B 2: /dis/du.IP.B ns.br.B 1: /dis (200.1.5.53!7003).br.B 2: /dis (200.1.5.53!7003).PPOnce the client disconnects from (unmounts) the cpu, the selected namespaces will be imported and the commands executed. Note: A .I cpudoes not have.I anynamespace of its own. All required namespaces.I mustbe imported, for a simple command such as.BR ls ,the minimum recommended namespace to import would be:.B /chan /dev /dis /module.PP.IR Register (1)may be used in conjunction with .I cputo register it with a .IR registry(4)and to export and serve its namespace across.IR dial(2) network connections. Incoming connections may also be displayed visually using.IR monitor (1).For example:.PP.BI "grid/register [" " options ..." " ] { grid/srv/cpu } | grid/srv/monitor 2 'CPU resource'.PPThis set of commands is encapsulated within the shell script.I runcpuwhich will automatically register .I cpuwith a.IR 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.I cpuoutside of.I runcpuunless the namespace it provides is required to be accessible in a different way to that provided by.IR register (1)..SH SOURCE.B /appl/grid/srv/cpu.b .SH BUGSAt the moment,.I Cpuwill only import namespaces across an unauthenticated connection as provided by.IR ns (1). .SH "SEE ALSO".IR monitor (1),.IR ns (1),.IR register (1),.IR session (1)