2019-01-22 11:12:29 +01:00
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# feature ideas
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- pluggable cli: commands for image, text, shader rendering
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- support animations / frame concept
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- visualization client
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- CnC: server distributes jobs to connected clients
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2020-01-14 15:26:16 +01:00
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- or fully P2P using [2D CAN / Z-ordercurve adressing](https://github.com/noerw/geo-dht) (p2p implementation needed)
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2019-01-22 11:12:29 +01:00
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- webassembly port?
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2020-01-14 03:34:05 +01:00
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- use userland tcp stack (e.g. https://github.com/google/netstack or even https://github.com/luigirizzo/netmap)
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2019-01-22 11:12:29 +01:00
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# performance considerations
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- server limitations: rendering is bottleneck. maybe artificial limitations (commands per draw, connections per IP, queue)
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- when network isn't bottleneck: fetch each pixel & only send updates for wrong color (?)
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- sync sending with draw frequency (?)
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- use virtual subnets for more IPs (ipv6?) (?)
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- client limitations: PCI bus is bottleneck? depends on HW I guess
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- precompute everything
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- distribute across cores for max PCI bus saturation (?)
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- network limitations: packet size, ACKs, congestion
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- treat benchmarks on `loopback` with care, it has no packet size limitation. real world interfaces will enforce a max size of 1514 bytes [1]
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- avoid packet split if >1514B (?)
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- use `TCP_NODELAY` (?)
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- https://stackoverflow.com/questions/5832308/linux-loopback-performance-with-tcp-nodelay-enabled
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- cognitive limitations: draw order
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- randomized pixel order should give a better idea of the image with equal dominance (?)
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# concept: CLI for distributed hochwasser v2
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> pixelflut endlich *durchgespielt*
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```
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hochwasser --server
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provide [type] [input] --effect --offset --scale --port --nosend
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subscribe --connections --shuffle --diffmode
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view --fullscreen
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```
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- CLI via `github.com/spf13/cobra`
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- `--server` refers to pixelflut server or hochwasser jobprovider, depending on mode
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- jobprovider has different input types (`image`, `text`, `shader`?), each is parsed into an `image.GIF`
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- jobprovider also sends image itself?
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- when subscriber connects to jobprovider, `GIF` is split up, and (re)distributed to all subscribers
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- protocol: (address,offset,imgdata) serialized with `gob`?
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- viewer fetches into framebuffer, renders via opengl?
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