as we are talking about the beta side ftm, the iup/down ld. server is down.....

i guess someone is playing with it...

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I recommend Secunia PSI: http://secunia.com/vulnerability_scanning/personal/
Go Georgia Tech.

Agreed, basically importing code from AP sources to the MB splitter and application. Building for all platforms could be problematic, note on the Applications page some haven't been updated since 5.12.

The x-setiathome format carries 6 bits per byte, I've never compared details to see if it's identical to UUencoding or Base64. The application code will use the same decoding if it's called Sun Binary, and of course the original data recorder used a Sun system.

The rate at which new builds can be tested at SETI Beta is fairly slow, so adapting the optimized apps is usually no problem. Obviously with incompatible WUs there would have to be a new application name, so no issues with running the new work on old apps.

                                                                Joe

Why are there two entrys for SPARC/Solaris and Linux/x86_64 in the Enhanced Table?

It doesn't change the fact of the statement and the Linux/x86_64 show two versions (5.12 and 5.28). It gives no indication as to the reason for this unlike the windows/x86 entries with CUDA support.

I'm assuming we don't already us compression so if we are I guess we can disregard.

If we compressed with 7-Zip we can get about a 27% savings in bandwidth - which is huge. I took a bunch of seti files and compressed them at default settings to get that 27%

First I did the files individually, then I did a batch in 1 finished file of 7-Zip. This ended up being more or less the same so there seems to be no benefit in compressing a batch of seti files into 1 compressed file.

2nd I set 7-Zip to Ultra compress with produced more or less the same results as the default setting which either means default compression is Ultra mode or compression maxes out.

Lastly, I compressed all my seti at home files on my 2nd machine to test a different sent of work units and got a compression rate of 28%. So as we can see there is variation depending on how compressible the work units are.

Personally I'm all for uncompressing the files at my end if it means a 27% bandwidth savings for the Seti team. I didn't test the compression that's built into Boinc but the point is there are savings to be had.

Of course the other side of this is the time it takes to compress the files in the first place. Now for me it didn't take that much time but we're only talking about 60 megs of files not the gigs and gigs Seti@home has. This would tie up cpu time at there end as well as hard drive access time. I guess they would have to weight what is more important but bandwidth seems to be a major factor for them.

Country Waring

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I, as well, attempted to compress several AP and MB workunits. Using the Windows XP built in zip compressor (compressed folders), I got 27 - 28% for MB and 1 - 3% for AP.

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You will be assimilated...bunghole!

I, as well, attempted to compress several AP and MB workunits. Using the Windows XP built in zip compressor (compressed folders), I got 27 - 28% for MB and 1 - 3% for AP.

Does anyone read this thread?

It was mentioned earlier that that results from the already used "compressing" algorithm for MB, namely UUencode or similar (effectively expanding 4 or 5 bytes to 6) while AP uses binary transfer.

Gruß,
Gundolf

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Computer sind nicht alles im Leben. (Kleiner Scherz)

SETI@home classic workunits 3,758
SETI@home classic CPU time 66,520 hours

I, as well, attempted to compress several AP and MB workunits. Using the Windows XP built in zip compressor (compressed folders), I got 27 - 28% for MB and 1 - 3% for AP.

Does anyone read this thread?

It was mentioned earlier that that results from the already used "compressing" algorithm for MB, namely UUencode or similar (effectively expanding 4 or 5 bytes to 6) while AP uses binary transfer.

Gruß,
Gundolf

Yes I did read this thread, and the point is that compressing a MB workunit in .zip format gives you 27% better compression than whatever method is currently being used.

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You will be assimilated...bunghole!

Umm, reporting is on the fritz again, getting "couldn't connect to server" on the messages. It's been this way since 0700 Berkeley time...

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Hello, from Albany, CA!...

I, as well, attempted to compress several AP and MB workunits. Using the Windows XP built in zip compressor (compressed folders), I got 27 - 28% for MB and 1 - 3% for AP.

Does anyone read this thread?

It was mentioned earlier that that results from the already used "compressing" algorithm for MB, namely UUencode or similar (effectively expanding 4 or 5 bytes to 6) while AP uses binary transfer.

Gruß,
Gundolf

Yes I did read this thread, and the point is that compressing a MB workunit in .zip format gives you 27% better compression than whatever method is currently being used.

The point is then after that compression you have to uncompress it by 27% to transmit it as text!

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I have a question - When seti sends me the files through the internet are they compressed and then I expand them to the text files that are on my computer? OR does seti@home compress the info into the text files and these text files are sent as is to my home and I can use them right away with no expanding them?

If I don't have to expand them and they send the text files as they appear in my seti data directory then clearly there is a more effective way to compress them with 7-Zip which could save bandwidth.

Country

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I have a question - When seti sends me the files through the internet are they compressed and then I expand them to the text files that are on my computer? OR does seti@home compress the info into the text files and these text files are sent as is to my home and I can use them right away with no expanding them?

If I don't have to expand them and they send the text files as they appear in my seti data directory then clearly there is a more effective way to compress them with 7-Zip which could save bandwidth.

Country

When SETI sends you the files through the Internet, they are expanded (to x-setiathome) and then you compress them (to binary). So, the way to save bandwidth would be to transfer them in binary format (like the AP tasks).

And since that has been said several times in this thread, I did ask if anyone reads it at all before posting.

Gruß,
Gundolf

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Computer sind nicht alles im Leben. (Kleiner Scherz)

SETI@home classic workunits 3,758
SETI@home classic CPU time 66,520 hours

well, hey you know that people on, in the western hemisphere jump to the end and don't read what has been said........

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I recommend Secunia PSI: http://secunia.com/vulnerability_scanning/personal/
Go Georgia Tech.

Yes I did read this thread, and the point is that compressing a MB workunit in .zip format gives you 27% better compression than whatever method is currently being used.

The point is then after that compression you have to uncompress it by 27% to transmit it as text!

HTTP is 8 bit, you can transmit binary.

The SETI@HOME logo on this page was not sent as encoded text, it was sent binary.

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Actually I did read the whole post but didn't fully understand it apparently but thank you for just implying I'm too lazy to read. Your new explanation makes more sense and I thank you for that, perhaps you should consider that next time.

Country

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Yes I did read this thread, and the point is that compressing a MB workunit in .zip format gives you 27% better compression than whatever method is currently being used.

The point is then after that compression you have to uncompress it by 27% to transmit it as text!

So...don't transmit it as text then? Transmit as .zip and have it be uncompressed when it is returned to the Seti servers?

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You will be assimilated...bunghole!

Yes I did read this thread, and the point is that compressing a MB workunit in .zip format gives you 27% better compression than whatever method is currently being used.

The point is then after that compression you have to uncompress it by 27% to transmit it as text!

HTTP is 8 bit, you can transmit binary.

The SETI@HOME logo on this page was not sent as encoded text, it was sent binary.

And a considerable number of corporate gateways/virus/firewalls won't transmit binary through them if it isn't a jpeg. Or at least wouldn't when the original Seti@home was released. Today many more do and I agree that the MB work units would be much better transmitted as binary.

As to compression of random noise, that is after all what every work unit is unless ET is out there, if you understand the math behind compression, you will know that the result is likely to be bigger than what you started with. True I'm sure there is some non-random noise in the work unit, like the time, frequency, and location of the work unit, but it is such a small fraction of the data it won't make a difference.

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HTTP is 8 bit, you can transmit binary.

The SETI@HOME logo on this page was not sent as encoded text, it was sent binary.

And a considerable number of corporate gateways/virus/firewalls won't transmit binary through them if it isn't a jpeg. Or at least wouldn't when the original Seti@home was released. Today many more do and I agree that the MB work units would be much better transmitted as binary.

As to compression of random noise, that is after all what every work unit is unless ET is out there, if you understand the math behind compression, you will know that the result is likely to be bigger than what you started with. True I'm sure there is some non-random noise in the work unit, like the time, frequency, and location of the work unit, but it is such a small fraction of the data it won't make a difference.

Not only do I understand that random binary does not compress, you'll probably find a post on this thread where I point that out.

... and there is the (server) CPU time to do the compression, which probably isn't worth it.

I wouldn't be surprised to find corporate firewalls that block .zip files as well, because they can be used to mask trojans coming in to the network.

Matt commented in a related post that work was being sent with a strange MIME type (suitable for MAN pages and that's about all) and he changed to to application/text, which is pretty harmless.

It seems to follow that BOINC doesn't use the (HTTP) MIME type at all, and they could just as easily tag .gif or .jpg on the end, send the right MIME type for an image, and that'd be that.

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theoretically speaking, if we were to get another server that only compressed and uncompressed the data, would that help?.....

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I recommend Secunia PSI: http://secunia.com/vulnerability_scanning/personal/
Go Georgia Tech.

But there is nothing to compress...

theoretically speaking, if we were to get another server that only compressed and uncompressed the data, would that help?.....

It doesn't make sense to me to take uncompressed, mostly-random binary data, encode it to text (six bits per character) and then compress that.

It makes more sense to see if we can eliminate the text encoding.

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As to compression of random noise, that is after all what every work unit is unless ET is out there, if you understand the math behind compression, you will know that the result is likely to be bigger than what you started with. True I'm sure there is some non-random noise in the work unit, like the time, frequency, and location of the work unit, but it is such a small fraction of the data it won't make a difference.

... and it suddenly dawned on me that if Astropulse can send work in raw binary, multibeam should be able to as well.

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