20180523, 09:08  #265  
Apr 2010
3·47 Posts 
Quote:
IMO that's slower overall, at least for small composites like c145. That's the reason I limited the fb. 

20180526, 23:23  #266 
I moo ablest echo power!
May 2013
3·577 Posts 
Error?
Code:
Info:Linear Algebra: Starting Warning:Command: Process with PID 23973 finished with return code 255 Error:Linear Algebra: Program run on server failed with exit code 255 Error:Linear Algebra: Command line was: /home/wombatman/cadonfs2.3.0/build/BenMeekinsPC/linalg/bwc/bwc.pl :complete 'thr=8' 'nullspace=left' 'matrix=/tmp/cado.ui87i89u/c165.sparse.bin' 'wdir=/tmp/cado.ui87i89u/c165.bwc' 'cpubinding=/home/wombatman/cadonfs2.3.0/parameters/misc/cpubinding.conf' 'cantor_threshold=2048' 2> /tmp/cado.ui87i89u/c165.bwc.stderr.3 b'Missing parameters: m and/or n at linalg/bwc/bwc.pl line 360.\n 
20180527, 02:16  #267 
I moo ablest echo power!
May 2013
3×577 Posts 
Since I can't edit the previous post, the solution was to add the appropriate parameter line to the new c165 params file (and in this case, to the snapshot as well). That's my bad. The lines I added were the following, copied from preexisting c165 params file:
Code:
########################################################################### # Linear algebra ########################################################################### tasks.linalg.bwc.interval = 1000 tasks.linalg.bwc.interleaving = 0 tasks.linalg.m = 64 tasks.linalg.n = 64 ########################################################################### # Characters ########################################################################### tasks.linalg.characters.nchar = 50 
20180702, 01:43  #268 
I moo ablest echo power!
May 2013
3×577 Posts 
CADONFS on RPis
I've been playing with using RPis as a minicluster with CADONFS. I'm running into what I think is a memory issue. The short version is this: the RPis can do polynomial selection workunits up to at least C17x (I think C177 is the highest I've done). However, they cannot handle sieving workunits above C117 (C119 and above led to the error detailed below), giving the following error repeatedly:
Code:
Error:Lattice Sieving: Program run on localhost failed with exit code 9 Error:Lattice Sieving: Stderr output follows (stored in file /tmp/cado.znzw_dvb/c120.upload/c120_sieving_196000197000#2.2w0rleb9.stderr0): b'madvise failed: Invalid argument\n' I know I can take this to the CADONFS programmers, but I figured I would check here first in case there's a simple solution. This is on an RPi Model 3B+(1GB RAM). 
20180702, 05:13  #269 
"Curtis"
Feb 2005
Riverside, CA
5×877 Posts 
If you're using 2.3.0, the C120 params file uses I = 14 for no good reason. C115 file uses I = 12. If you're using the git 3.0.0, then params.c120 uses I = 12 and I dunno why you're getting crashes.
I=12 should fit comfortably in 1GB. 
20180702, 05:45  #270 
I moo ablest echo power!
May 2013
3·577 Posts 
It's the 2.3.0 version. Thanks!

20180702, 08:03  #271  
"Victor de Hollander"
Aug 2011
the Netherlands
2·587 Posts 
Quote:
CADONFS 3.0dev timings for RSA100 on OdroidU2: http://mersenneforum.org/showpost.ph...&postcount=129 RSA100 with Msievelasieve4python script on OdroidU2 in: http://mersenneforum.org/showthread.php?t=23471 

20180702, 19:21  #272 
I moo ablest echo power!
May 2013
3·577 Posts 
Sure. Started it just now with default parameters, 4 threads.

20180703, 02:35  #273 
I moo ablest echo power!
May 2013
3×577 Posts 
Code:
Info:Square Root: finished Info:Square Root: Factors: 37975227936943673922808872755445627854565536638199 40094690950920881030683735292761468389214899724061 Info:Square Root: Total cpu/real time for sqrt: 441/124.699 Info:Polynomial Selection (size optimized): Aggregate statistics: Info:Polynomial Selection (size optimized): potential collisions: 2890.72 Info:Polynomial Selection (size optimized): raw lognorm (nr/min/av/max/std): 2920/32.780/37.719/38.560/0.695 Info:Polynomial Selection (size optimized): optimized lognorm (nr/min/av/max/std): 2920/32.780/36.417/38.550/0.985 Info:Polynomial Selection (size optimized): Total time: 403.24 Info:Polynomial Selection (root optimized): Aggregate statistics: Info:Polynomial Selection (root optimized): Total time: 510.88 Info:Polynomial Selection (root optimized): Rootsieve time: 507.48 Info:Generate Factor Base: Total cpu/real time for makefb: 8.42/2.29804 Info:Generate Free Relations: Total cpu/real time for freerel: 245.18/62.0037 Info:Lattice Sieving: Aggregate statistics: Info:Lattice Sieving: Total number of relations: 2689258 Info:Lattice Sieving: Average J: 1023.74 for 88142 specialq, max bucket fill: 0.707584 Info:Lattice Sieving: Total CPU time: 40586.2s Info:Filtering  Duplicate Removal, splitting pass: Total cpu/real time for dup1: 24.95/68.3106 Info:Filtering  Duplicate Removal, splitting pass: Aggregate statistics: Info:Filtering  Duplicate Removal, splitting pass: CPU time for dup1: 67.6s Info:Filtering  Duplicate Removal, removal pass: Total cpu/real time for dup2: 108.2/94.0727 Info:Filtering  Singleton removal: Total cpu/real time for purge: 117.94/84.1812 Info:Filtering  Merging: Total cpu/real time for merge: 386.29/355.652 Info:Filtering  Merging: Total cpu/real time for replay: 35.57/37.4631 Info:Linear Algebra: Total cpu/real time for bwc: 18146.5/0.00117993 Info:Linear Algebra: Aggregate statistics: Info:Linear Algebra: Krylov: WCT time 2941.91 Info:Linear Algebra: Lingen CPU time 303.06, WCT time 84.66 Info:Linear Algebra: Mksol: WCT time 1477.02 Info:Quadratic Characters: Total cpu/real time for characters: 19.53/9.2079 Info:Square Root: Total cpu/real time for sqrt: 441/124.699 Info:HTTP server: Shutting down HTTP server Info:Complete Factorization: Total cpu/elapsed time for entire factorization: 61033.9/16947.3 Info:root: Cleaning up computation data in /tmp/cado.1xpfmivz 37975227936943673922808872755445627854565536638199 40094690950920881030683735292761468389214899724061 Polyselect: 23 minutes, 42 seconds Sieving: 40586.2 seconds (~5.5 hours real time) Filtering: 639 secs (~10 minutes) Linear Algebra: 2941.91+84.66+1477.02 = 4503.59 seconds (~1.25 hours) ***4 threads here Sqrt: 125 seconds Total (CPU/Real): 61033.9/16947.3 seconds 
20180703, 10:38  #274  
"Victor de Hollander"
Aug 2011
the Netherlands
2×587 Posts 
Quote:
I'm a bit surprised that it is not faster than the quadA9 in the ODROIDU2?! Even after taking into account the clockspeed difference (1700 MHz for the U2 vs. 1400MHz of the RP3B+) Were you using the CADO 3.0dev latest git version? 

20180703, 14:11  #275 
I moo ablest echo power!
May 2013
3×577 Posts 
No, this was with the CADO2.3.0 release. I haven't compiled the latest version.

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