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[cado-nfs] Excessive lingen Time for Processing


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  • From: Ed Hall <ed_ka2fwj@yahoo.com>
  • To: "cado-nfs@inria.fr" <cado-nfs@inria.fr>
  • Subject: [cado-nfs] Excessive lingen Time for Processing
  • Date: Fri, 15 Jul 2022 13:53:13 +0000 (UTC)
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Dear Team,

I've noticed an issue with lingen processing taking a long time, and have noted someone else mentioning this trouble appears linked to other processes being run concurrently.

Here are some log snippet examples:

example 1:
======================================================================
N = 317860257761195156062448817866731527353714583825670111819545478820873529533694125611652769126090898710161707235584125318371
. . .
PID164309 2022-06-25 20:43:34,168 Info:Linear Algebra: Starting
PID164309 2022-06-25 20:43:34,168 Debug:Linear Algebra: linalg.run(): Task state: {'ran_already': False}
PID164309 2022-06-25 20:44:30,606 Info:Linear Algebra: krylov: N=1000 ; ETA (N=17000): Sat Jun 25 20:49:39 2022 [0.019 s/iter]
. . .
PID164309 2022-06-25 20:49:43,143 Info:Linear Algebra: krylov: N=17000 ; ETA (N=17000): Sat Jun 25 20:49:43 2022 [0.020 s/iter]
PID164309 2022-06-25 20:50:15,150 Info:Linear Algebra: lingen ETA: not available yet
. . .
PID164309 2022-06-25 21:50:16,098 Info:Linear Algebra: lingen ETA: not available yet
======================================================================
I stopped this one and ran Msieve LA.

example 2:
======================================================================
N = 5345540827742353591215396394014521854948220766646127207087257608243232886939896912454733789530932051160729187887
. . .
PID411958 2022-06-27 06:35:07,729 Info:Linear Algebra: Starting
PID411958 2022-06-27 06:35:07,729 Debug:Linear Algebra: linalg.run(): Task state: {'ran_already': False}
PID411958 2022-06-27 06:35:32,391 Info:Linear Algebra: krylov: N=1000 ; ETA (N=8000): Mon Jun 27 06:36:31 2022 [0.009 s/iter]
. . .
PID411958 2022-06-27 06:36:32,111 Info:Linear Algebra: krylov: N=8000 ; ETA (N=8000): Mon Jun 27 06:36:32 2022 [0.009 s/iter]
PID411958 2022-06-27 06:38:09,934 Info:Linear Algebra: lingen ETA: not available yet
. . .
PID411958 2022-06-27 08:17:34,380 Info:Linear Algebra: lingen ETA: Mon Jun 27 08:22:31 2022
PID411958 2022-06-27 08:17:44,719 Info:Linear Algebra: mksol: N=1000 ; ETA (N=4000): Mon Jun 27 08:18:12 2022 [0.010 s/iter]
======================================================================

example 3:
======================================================================
N = 3908677652510547980062644719803090395223085498481645946005993153584528658059849062542727218719253989901417375982942567
. . .
PID588524 2022-06-27 19:19:00,748 Info:Linear Algebra: Starting
PID588524 2022-06-27 19:19:00,748 Debug:Linear Algebra: linalg.run(): Task state: {'ran_already': False}
PID588524 2022-06-27 19:19:56,296 Info:Linear Algebra: krylov: N=1000 ; ETA (N=16000): Mon Jun 27 19:24:40 2022 [0.019 s/iter]
. . .
PID588524 2022-06-27 19:24:38,853 Info:Linear Algebra: krylov: N=16000 ; ETA (N=16000): Mon Jun 27 19:24:38 2022 [0.019 s/iter]
PID588524 2022-06-27 19:26:21,580 Info:Linear Algebra: lingen ETA: not available yet
. . .
PID588524 2022-06-27 22:32:13,816 Info:Linear Algebra: lingen ETA: Mon Jun 27 22:55:10 2022
PID588524 2022-06-27 22:32:35,243 Info:Linear Algebra: mksol: N=1000 ; ETA (N=8000): Mon Jun 27 22:34:58 2022 [0.020 s/iter]
======================================================================

I must confess to not thinking of checking the priority level during these runs and will try to do so (using top) if I notice this again.

Sincerely,
Edwin Hall


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