mirror of https://github.com/BOINC/boinc.git
119 lines
2.9 KiB
Plaintext
119 lines
2.9 KiB
Plaintext
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Global view
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Projects
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Applications
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Scheduling server
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Database
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Project back end (interacts with scheduler via DB, files)
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web server
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Data servers
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Clients
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core client, applications, files
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single download
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preferences
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Abstractions
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projects
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applications
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Workunits -> input file descriptors -> files
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Results -> output file descriptors -> files
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file descriptors can give name/FD
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files can have various properties
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files up/downloaded to servers; may be "sticky"
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client-generated scratch files; may be "sticky"
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some files originate on servers and are sent to clients;
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some files originate on client and are deleted after the WU
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some files originate on client and become input for later WUs
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some files originate on client and are uploaded (and maybe kept)
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Results are generated in advance
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(alternative: let clients fill in template)
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Properties of workunits
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disk/RAM max needs
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IOPs/FLOPs/memBW needs
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File transfer requests
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Result sequences
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Examples
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SETI@home case: generate multiple results; generate more as needed
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CP.com case: result sequences
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normal case
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interrupted/restarted case
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access to large output files
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How things work on the scheduling server
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WUs and results described by XML files (has file, resource info)
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user preferences described by XML files
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file transfer requests described by XML files
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DB keeps track of
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apps
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hosts
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platforms
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users
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app versions
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core versions
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WUs
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all input files available?
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results
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unsent/sent/completed/error/timed out
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Host measurements
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CPU: #cpus, int, FP, mem BW
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mem: total, cache, swap
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disk: total, free
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network: bandwidth up/down. IP address history
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on fraction
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connected fraction
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How we keep track of different hosts
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RPC seqno
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The scheduling server algorithm
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Project back end: examples
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How things work in the client
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FSM model
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network stack
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processor slots
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account file, client state file
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main loop of client
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When does the client ask for work?
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hi/lo water marks
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server backoff requests
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failed connection backoff
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What are user preferences?
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max RAM to use while user active
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confirm before connect?
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don't compute while on batteries
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min time between disk I/O
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max disk space to use (absolute, or % of free)
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list of projects
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% of resources (disk, CPU)
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hours to communicate/compute
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max #bytes to upload each day
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max #bytes to download each day
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How are preferences adjusted?
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Web interface
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XML file
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(extensible set of preferences w/o server change)
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How a users starts up
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How a user adds/removes projects
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How a project starts up
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Security mechanisms
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Result validation and credit
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