Operation Megabit Twin

[amphoria]

The is the file without the header:

http://www.sendspace.com/file/0aev4n

I have also attached a prepared header.txt. You now have a couple of alternative solutions.

[amphoria]

45T-50T complete, around 520,000 k's removed.

http://www.sendspace.com/file/73p54i

Reserving 50T-60T.

[Dougal]

taking 60-61 to to get a feel for it,will more than likely take it to 65 or 70 if noone else makes a reservation by the time i get to 61.

[Oddball]

Originally Posted by Dougal

will more than likely take it to 65 or 70 if noone else makes a reservation by the time i get to 61.

I'll get 61T-62T.

edit: Anyway, who's going to verify the factors and remove the k's from the sieve file once we start LLRing?

[Oddball]

Releasing 61T-62T.

Although I've been able to download and extract the file, I can't edit the header. Using copy in the command prompt gives an "access is denied" error even though the file isn't read-only. Neither the XVI32 program nor the Textpad one lets me open it, since it requires too much memory (I have 8GB of RAM, but the programs won't let me use it).

[mdettweiler]

Originally Posted by Oddball

Releasing 61T-62T.

Although I've been able to download and extract the file, I can't edit the header. Using copy in the command prompt gives an "access is denied" error even though the file isn't read-only. Neither the XVI32 program nor the Textpad one lets me open it, since it requires too much memory (I have 8GB of RAM, but the programs won't let me use it).

Very strange--I would think that with 8 GB of memory you most definitely should be able to open the file, one way or another. The "access is denied" error makes me suspect a file permissions problem rather than a file-is-too-big problem.

Try right-clicking on the file, selecting Propertires, going to the Security tab, and making sure that "Full Control" access is granted for at least one user group to which you belong (whether that be Administrators, Users, or even just the group representing solely your username). If you need to make any changes to this, try the "copy" command again and see if it works now.

In case it really is a file-is-too-big problem, one quick question that might give me a better idea as to why it's not working: are you on a 32-bit or 64-bit operating system? (If 32-bit, there is a 2 GB per-process RAM limit that prevents programs from using the entire 8 GB; if 64-bit, then I'm not sure what's happening.)

On a completely unrelated note: I noticed that in the first post of this thread, the reservations table for Stage 3 (that is, the currently active one) lists ranges in terms of k, when those figures are actually p since there's only one big sieve file at this point.

[Oddball]

Originally Posted by mdettweiler

Very strange--I would think that with 8 GB of memory you most definitely should be able to open the file, one way or another. The "access is denied" error makes me suspect a file permissions problem rather than a file-is-too-big problem.

Try right-clicking on the file, selecting Propertires, going to the Security tab, and making sure that "Full Control" access is granted for at least one user group to which you belong (whether that be Administrators, Users, or even just the group representing solely your username). If you need to make any changes to this, try the "copy" command again and see if it works now.

"Full control" access is granted. I'm the only person who has used this computer since the day I bought it, so the Administrator/User issue shouldn't be a problem.

In case it really is a file-is-too-big problem, one quick question that might give me a better idea as to why it's not working: are you on a 32-bit or 64-bit operating system? (If 32-bit, there is a 2 GB per-process RAM limit that prevents programs from using the entire 8 GB; if 64-bit, then I'm not sure what's happening.)

It's a 64 bit system. I'm using Windows 7.

On a completely unrelated note: I noticed that in the first post of this thread, the reservations table for Stage 3 (that is, the currently active one) lists ranges in terms of k, when those figures are actually p since there's only one big sieve file at this point.

Fixed.

[TimSorbet]

Originally Posted by Oddball

Although I've been able to download and extract the file, I can't edit the header.

Have you tried the advice/methods here? (the linked post and the one after it)
http://www.mersenneforum.org/showthr...327#post230327
Or you could try splitting the file using a file splitter like GSplit (you can even make the pieces the sizes you want) or 7-zip (you have to make all the pieces the same size; tell 7-zip to put the file into a Tar archive split into some number of bytes that you can edit easily, then edit the .001 file with a hex editor like XVI32, and open the .001 file with 7-zip to recombine).
If it really is an issue with permissions instead of opening the huge file, all of these methods will fail. We'll see.

[Oddball]

The GSplit file splitter worked

Reserving 61T-62T.

[MooMoo2]

Could someone divide the file into 6 parts again (0-20T, 20T-40T, 40T-60T, etc) and upload them? The sendspace links in posts like these:

http://www.mersenneforum.org/showpos...&postcount=122
http://www.mersenneforum.org/showpos...&postcount=119

have expired, so I can't get the files from there.

On my PC, sieving the 0-120T file gives me a removal rate of 1.2 sec/k, but sieving each 20T file separately gives me a removal rate of 0.8 sec/k.

[Dougal]

im reserving 62-70