A BOINC project includes of a set of daemons
(programs that run all the time).
Each program should be listed as a daemon in the
config.xml file.
They all have the command-line options:
";
list_start();
list_item("-d N",
"Sets the verbosity level.
1 = critical messages only,
2 = normal messages,
3 = detailed debugging info."
);
list_item("-one_pass",
"Process all available items, then quit."
);
list_item("-mod n i",
"Handle only workunits for which mod(id, n) = i.
This lets you run the daemon on arbitrarily many machines.
(available for feeder, transitioner, validator)."
);
list_end();
echo "
Work generator
There is one work generator per application.
It creates workunits and the corresponding input files.
It is application-specific, and uses
BOINC library functions
for registering the workunits in the database.
During testing, you can create a single workunit using
create_work,
then use the daemon program
make_work
to copy this workunit as needed to maintain a given supply of work.
Feeder
This program is supplied by BOINC and is application independent.
It creates a shared-memory segment used to pass database records
to CGI scheduler processes.
Transitioner
This program is supplied by BOINC and is application independent.
It handles state transitions of workunits and results.
It generates initial results for workunits,
and generates more results when timeouts or errors occur.
Validator
There is one validator per application.
It compares redundant results and selects a canonical result
representing the correct output,
and a canonical credit granted to users and hosts
that return the correct output.
Assimilator
There is one assimilator per application.
It handles workunits that are 'completed':
that is, that have a canonical result or for which
an error condition has occurred.
Handling a successfully completed result might involve
record results in a database and perhaps generating more work.
File deletion
The application-independent program
file_deleter
deletes input and output files when they are no longer needed.
Database purging
The application-independent program
db_purge
removes work-related database entries when they are no longer needed.
This keeps your database at a constant size even
when your project runs for a long time.
";
page_tail();
?>