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Old 2020-06-20, 13:43   #56
preda
 
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Quote:
Originally Posted by kriesel View Post
Please consider implementing settable download and upload rate limits also. Many universities have fat pipes. And some parts of a university may be modest sized remote sites with thin pipes. I worked at one such for decades. As far as I know, it has never had access faster than 10Mbps. There was a several year stretch of T1 (1.544Mbps). 2GB at T1 is 2.9 hours. At 10Mbs line rate it is 0.44 hours each. Saturating a link can lead to issues for other things, like page loads from a web server. We experienced multiple cases over the years where the incoming or outgoing got saturated and made everyone's internet use difficult or fruitless for the duration. (Third party IP spoofed packet to cause a Swiss HP printer to produce a flood to us, or someone opening a malicious email attachment that launched a spam server, that sort of thing.) Periodically creating sustained link saturation may get the activity banned from a network.

User settable:
  • schedule window for downloads of verification work
  • schedule window for uploads of proof files
  • transmission rate limit(s); separate up and down for asymmetric connections?
  • disk quota
  • participation in verification work
  • proof power preference
Let's not over-obsess over the network. It's 2020 and it's only going to get faster from here. I have 120MBit/s effective upload (and 500Mbit/s download) on my mobile phone! People have been watching netflix online, and video-conference online, youtube etc for decades now.. I bought one xbox game, and it was 40GB downloadable content.

I understand there exist special situations, but extremely slow network is not the common case.

Last fiddled with by preda on 2020-06-20 at 13:47
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Old 2020-06-20, 14:36   #57
M344587487
 
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Quote:
Originally Posted by preda View Post
...
I understand there exist special situations, but extremely slow network is not the common case.
More common than you think if you consider the following to be extremely slow. Mine is ~1MBit/s upload (I think the average for my type of connection is closer to 2) with 10-20 MBit/s download depending on time and load. It's fast enough for a few simultaneous video streams and SD video upload so for normal usage it's good enough. Half of the UK is on a similar connection. A good chunk of the other half have fibre to the exchange which is 2-5 times quicker at a guess.



So my connection takes ~16 minutes to upload 120 MiB. It's fast enough to participate but may disrupt other tasks on the network if it cannot be scheduled. Not a massive deal just a nice thing to be able to do.
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Old 2020-06-20, 18:36   #58
kriesel
 
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Quote:
Originally Posted by M344587487 View Post
More common than you think.
For some nations, average connection speed is 1-2Mbps; none average above 30-52Mbps, per https://en.wikipedia.org/wiki/List_o...nection_speeds
Speed is likely to go up with time. So is exponent, upload and download size, etc.

Last fiddled with by kriesel on 2020-06-20 at 18:38
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Old 2020-06-20, 20:39   #59
henryzz
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There are a lot of ADSL lines in the UK that have a 448 kbps upload limit(often claiming to be 1mbps). I would suggest attempting to make the system work for that sort of speed if possible.
The ridiculous thing is mobile phones get better up and down speed than a fair amount of the country's homes.

What are the options? The current system is 200%. What file sizes are we talking for a total workload of 120% or 110%? Some users will be willing to sacrifice a bit of speed for smaller uploads.
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Old 2020-06-20, 20:43   #60
ewmayer
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Quote:
Originally Posted by preda View Post
I have to correct that interpretation of gpuowl's checkpoint size: gpuowl does store a single residue, and that is just the GEC (the "from the start" one). The actual residue can be computed from the GEC residue (but not the other way around), and this is done on load.
Thanks - very clever.

Re. proof-of-work files, if there are interim ones of such which could be uploaded during the PRP run in order to spread the uploads out across the run, that would be immensely useful in terms of managing bandwidth. People who are paranoid about air-gapped-ness could still have the option to upload the whole fileset in one shot after run completion, from some lower-security computer they use to access the web.
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Old 2020-06-21, 04:22   #61
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Originally Posted by ewmayer View Post
Re. proof-of-work files, if there are interim ones of such which could be uploaded during the PRP run in order to spread the uploads out across the run, that would be immensely useful in terms of managing bandwidth.
I think patnashev said that that is not possible; you can calculate the proof only after test is done (I might be misunderstanding this part). However, that doesn't matter; you can spread out the upload while the /next/ test is crunching.
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Old 2020-06-21, 05:31   #62
Prime95
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Quote:
Originally Posted by axn View Post
I think patnashev said that that is not possible; you can calculate the proof only after test is done (I might be misunderstanding this part).
You understand correctly.
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Old 2020-06-21, 12:55   #63
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Quote:
Originally Posted by henryzz View Post
The ridiculous thing is mobile phones get better up and down speed than a fair amount of the country's homes.
Don't forget that SpaceX's Starlink satellite Internet system will be up and running soon. It is 1GB bandwidth (although they don't break out upload speeds) at latencies of just 25 to 35 milliseconds.
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Old 2020-06-21, 12:59   #64
retina
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Not everyone has unlimited bandwidth.

Some people pay by the megabyte.
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Old 2020-06-21, 14:31   #65
kriesel
 
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Quote:
Originally Posted by PhilF View Post
Don't forget that SpaceX's Starlink satellite Internet system will be up and running soon. It is 1GB bandwidth (although they don't break out upload speeds) at latencies of just 25 to 35 milliseconds.
The only measured rate I could find quickly is 610Mbits / second download to an airplane in flight in the WIkipedia article, and in theory 1Gbit/sec https://broadbandnow.com/Starlink. Not 1GByte/sec.
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Old 2020-06-21, 15:09   #66
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Quote:
Originally Posted by kriesel View Post
The only measured rate I could find quickly is 610Mbits / second download to an airplane in flight in the WIkipedia article, and in theory 1Gbit/sec https://broadbandnow.com/Starlink. Not 1GByte/sec.
You're right, my mistake. I meant 1Gb per second.

Either way, it's enough for me, and enough to help get this project off the ground from almost anywhere on the globe.
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