[QUOTE=prss;429215]Hi

As i dont have enough space in memory for store a large matrix and have just one computer for linear algebra stage, i might consider the idea of storing matrix in hard disk, load
parts of matrix in memory to solve it and after merge results ?[/QUOTE]

How much memory do you have? Most modern machines should have enough memory to handle the postprocessing of a 30-bit job.

I have a notebook core i5 with 6GB of memory and i want factorize a semiprime number with 220 digits.

This thread is for volunteering and reserving the postprocessing work (filtering, linear algebra, sqrt, GCD, all using msieve) for various factoring efforts listed [url=http://escatter11.fullerton.edu/nfs/crunching.php]here[/url] and [url=http://escatter11.fullerton.edu/nfs/crunching_e.php]here[/url]. If you are attempting to factor a specific 220 digit semi-prime of your choosing, this is not the appropriate thread. If you have a means of factoring it with SNFS, start or add to a thread in the factoring subforum. And splitting so large a number with GNFS is beyond all but the most powerful clusters.

If I've misunderstood your intentions, please let me know.

If your semiprime does not have a special form you will basically need a cluster to do the linear algebra in less than a year. You can't solve that problem in pieces, all the data needs to be in high-speed memory all the time.

C170_P226_plus_1
 

[code]
prp82 factor: 5303258990189889511430437164253892679796133232738990641774462289151589284087109171
prp88 factor: 3567385621612041633609685002897196562668614097641201395138179222011019878627683367957233
[/code]

C162_145_107 completed - 21 hours for 6.66M matrix with TD=140

[CODE]prp79 factor: 2003036979769084365915195150631131038175961331435920440414819893898131595160057
prp84 factor: 158397560600399204930433968281157818394873287876550371319082524405850881378911710181[/CODE]

C162_933436_12487 completed - 18.5 hours for 6.1M matrix with TD=140

[CODE]prp65 factor: 22131034012344789387802206414211495789164983960870252586906452363
prp97 factor: 5486043294775208670334787765354449737640262732391650937290280884652611369291810503676276109456149[/CODE]

Taking C186_2426789_31_plus_3162104763 and 32333_224 for LA.

I'll take 11101_228 next.

I'll also take 55551_228.

William: C152_P171_plus_1 factored as
[code]p67 factor: 2668400554531314975973645152119742976041832327640414634947565752407
p86 factor: 25257255185319797278196990545359279076105045141113879192452842595315390222372208800581[/code]on the first dependency.