2+ table

[Batalov]

There's a tasty home-range gnfs again!

[bdodson]

Originally Posted by Batalov

There's a tasty home-range gnfs again!

Taken by "Krone". The numbers currently listed as smallest available
are c161 and c176 (2nd). Even better, there are just seven reserved
numbers below the c176 (at least one of which is due within two weeks,
max). -Bruce

[Andi47]

Fri Jul 16 07:14:19 2010 prp74 factor: 38958796555027596194834220569683521938514173251237621993999866030334910251
Fri Jul 16 07:14:19 2010 prp79 factor: 4229446125490357176066452360993989138464237773415805870583988716154685806357331

sieved most of Q=8M to 40M and 48M to 50M for 51.3M relations, 42.7M unique. Matrix was 4.4M*4.4M, solved in ~25 hours (with pauses due to summer heat) on 6 thread of an intel i7 (2.8 GHz, windows 7 pro 64 bit). Factors found in the 3rd dependency.

[jasonp]

Well done!

[henryzz]

Originally Posted by Andi47

Fri Jul 16 07:14:19 2010 prp74 factor: 38958796555027596194834220569683521938514173251237621993999866030334910251
Fri Jul 16 07:14:19 2010 prp79 factor: 4229446125490357176066452360993989138464237773415805870583988716154685806357331

sieved most of Q=8M to 40M and 48M to 50M for 51.3M relations, 42.7M unique. Matrix was 4.4M*4.4M, solved in ~25 hours (with pauses due to summer heat) on 6 thread of an intel i7 (2.8 GHz, windows 7 pro 64 bit). Factors found in the 3rd dependency.

If you are struggling because of heat you might consider underclocking and undervolting. That could provide greater performance than currently on average and save you time shutting down and booting the pc.

[Andi47]

Originally Posted by henryzz

If you are struggling because of heat you might consider underclocking and undervolting. That could provide greater performance than currently on average and save you time shutting down and booting the pc.

It is not (yet) my PC overheating, but my flat reaching temperatures well over 30°C...

I will (almost) cease my factoring activities for now until the weather gets a bit cooler. (hey, that's a hobby, and I don't want to do it at all costs...)

[henryzz]

Originally Posted by Andi47

It is not (yet) my PC overheating, but my flat reaching temperatures well over 30°C...

I will (almost) cease my factoring activities for now until the weather gets a bit cooler. (hey, that's a hobby, and I don't want to do it at all costs...)

Underclocking and undervolting will still reduce its heat output to the room reducing the temperature increase caused by your pc. I understand you not wanting to boil. I have done enough of that already this year.

[R.D. Silverman]

Here is 2,1191+ c180 = p65.p115

p65 = 37021310507568514045709078753457472746397308843224255251382376361
p115 = 6488855516387758047783108616235043210130706479966540073784107995269862901361284623441660830796154322268718245117609

The matrix took a while on my single threaded laptop..... 867 hours

2,1191- is 80 to 85% sieved. I will do 2,2166L next, followed by 5,785M

[xilman]

Originally Posted by R.D. Silverman

The matrix took a while on my single threaded laptop..... 867 hours

Wow!

Nice work.

Paul

[frmky]

Originally Posted by R.D. Silverman

The matrix took a while on my single threaded laptop..... 867 hours

Wow indeed! If you have a place to post the relations or can SFTP them to my server, I'll be happy to save the wear on your laptop and complete the LA and sqrts for future factorizations for you.

Edit: Compare to the latest version of msieve on 16 quad-core Infiniband-connected computers:

matrix is 15176217 x 15176395 (5554.9 MB) with weight 1592274791 (104.92/col)
sparse part has weight 1289249761 (84.95/col)
ETA 88h55m

[R.D. Silverman]

Originally Posted by frmky

Wow indeed! If you have a place to post the relations or can SFTP them to my server, I'll be happy to save the wear on your laptop and complete the LA and sqrts for future factorizations for you.

Edit: Compare to the latest version of msieve on 16 quad-core Infiniband-connected computers:

matrix is 15176217 x 15176395 (5554.9 MB) with weight 1592274791 (104.92/col)
sparse part has weight 1289249761 (84.95/col)
ETA 88h55m

It is generally more satisfying to complete something yourself, even if others
can do it faster.

If I were unable to do the matrix, I would ask for help, as I have in the
past. But as long as I am able to do the LA, I will.

I work with the hardware that I have available.

While there is plenty of large iron where I work, I can not use it.