links provide both message paths and optional data sharing between tasks
Switchboard task is provided to allow mutually consenting arbitrary tasks to communicate
security is a big issue to Los Alamos
DEMOS/MP
A process’s abilities are determined by the links that it holds. A process’s privileges are determined only by the links that it holds
not all machines have disks, remote paging is implemented
Switchboard
Switchboard is a single name server, which aids in establishing connections between processes like a telephone operator. Any process with a link to the switchboard has to:
announce itself to the world
request a link to another process that has already announced itself
Only one global switchboard. It’s location is broadcast across the network.
Local switchboard is an exact copy of the global switchboard
Once a new machine is booted, it posts a link to the switchboard
Machines are partitioned by multiple memory manager
A centralized recorder reliably stores all messages that are transmitted
Reviews
channels are sockets? is just a way to provide multiplex
will the switchboard and the centralized recorder be the whole system’s bottleneck?
it would, if the number exceeds 1000
SB and recorder is fast, there will be hierachy SBs
Notes
everything is a link
link is equivalant to file descriptor(stdin, stdout, switchboard, processmanager, memorymanager), link a handle to object
