What causes the error message highlighted in RED below and should I continue or abort task?
Task has been running for about 3.5 hours and estimated to run about 28.25 hours total based on whats been completed.
Application: Sierpinski / Riesel Base - average3 0.22
Name: S789_350-400k_wu_1863_1
Info from the stderr.txt file in the slots directory:
20:48:12 (5792): wrapper (7.5.26012): starting
20:48:12 (5792): wrapper: running llr.exe ( -d -oPgenInputFile=input.prp -oPgenOutputFile=primes.txt -oDiskWriteTime=10 -oOutputIterations=50000 -oResultsFileIterations=99999999)
Base factorized as : 3*263
Base prime factor(s) taken : 263
Starting N-1 prime test of 96*789^367162+1
Using all-complex AMD K8 FFT length 480K, Pass1=384, Pass2=1280, a = 3
Iter: 1/3533521, ERROR: ROUND OFF (0.4995842595) > 0.4
Continuing from last save file.
Starting N-1 prime test of 96*789^367162+1
Using all-complex AMD K8 FFT length 480K, Pass1=384, Pass2=1280, a = 3
Iter: 1/3533521, ERROR: ROUND OFF (0.4995842595) > 0.4
Unrecoverable error, Restarting with next larger FFT length...
Continuing from last save file.
Starting N-1 prime test of 96*789^367162+1
Using all-complex AMD K8 FFT length 512K, Pass1=512, Pass2=1K, a = 3
96*789^367162+1, bit: 50000 / 3533521 [1.41%]. Time per bit: 28.756 ms.
96*789^367162+1, bit: 100000 / 3533521 [2.83%]. Time per bit: 28.391 ms.
96*789^367162+1, bit: 150000 / 3533521 [4.24%]. Time per bit: 28.861 ms.
96*789^367162+1, bit: 200000 / 3533521 [5.66%]. Time per bit: 28.475 ms.
96*789^367162+1, bit: 250000 / 3533521 [7.07%]. Time per bit: 28.199 ms.
96*789^367162+1, bit: 300000 / 3533521 [8.49%]. Time per bit: 28.728 ms.
96*789^367162+1, bit: 350000 / 3533521 [9.90%]. Time per bit: 29.261 ms.
96*789^367162+1, bit: 400000 / 3533521 [11.32%]. Time per bit: 32.842 ms.
*******
I had a task http://srbase.my-firewall.org/sr5/result.php?resultid=379954726 that ran to completion but was marked invalid with similar error messages.
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rebirtherVolunteer moderator
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I found an explanation from Jean.
In pretty rare cases, when an exponent is near the upper limit of the FFT length chosen by the Gwnums code, a roundoff > 0.40 error can happen (even while using a non overclocked machine), then, the 3.7 LLR version restarts from the last save file, and redoes the faulty iteration using a slower, more reliable method, so the error cannot occur again.
The validator is looking for words like error and invalid the WU. Round off errors producing most in the cases wrong results. If these are going to be valid they must be double check again.
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... And it has happened again. WASTED TIME FOR NO CREDIT!
Task 384400783
Task Name: S950_350-400k_wu_26362_0
Stderr output
<core_client_version>7.16.3</core_client_version>
<![CDATA[
<stderr_txt>
15:23:27 (3340): wrapper (7.5.26012): starting
15:23:27 (3340): wrapper: running llr.exe ( -d -oPgenInputFile=input.prp -oPgenOutputFile=primes.txt -oDiskWriteTime=10 -oOutputIterations=50000 -oResultsFileIterations=99999999)
Base factorized as : 2*5^2*19
Base prime factor(s) taken : 5, 19
Starting N-1 prime test of 34*950^371624+1
Using all-complex AMD K8 FFT length 480K, Pass1=384, Pass2=1280, a = 3
Iter: 1/3676020, ERROR: ROUND OFF (0.4995912925) > 0.4
Continuing from last save file.
Starting N-1 prime test of 34*950^371624+1
Using all-complex AMD K8 FFT length 480K, Pass1=384, Pass2=1280, a = 3
Iter: 1/3676020, ERROR: ROUND OFF (0.4995912925) > 0.4
Unrecoverable error, Restarting with next larger FFT length...
Continuing from last save file.
Starting N-1 prime test of 34*950^371624+1
Using all-complex AMD K8 FFT length 512K, Pass1=512, Pass2=1K, a = 3
34*950^371624+1, bit: 50000 / 3676020 [1.36%]. Time per bit: 31.502 ms.
34*950^371624+1, bit: 100000 / 3676020 [2.72%]. Time per bit: 28.349 ms.
34*950^371624+1, bit: 150000 / 3676020 [4.08%]. Time per bit: 28.316 ms.
34*950^371624+1, bit: 200000 / 3676020 [5.44%]. Time per bit: 27.737 ms.
34*950^371624+1, bit: 250000 / 3676020 [6.80%]. Time per bit: 27.535 ms.
34*950^371624+1, bit: 300000 / 3676020 [8.16%]. Time per bit: 27.565 ms.
34*950^371624+1, bit: 350000 / 3676020 [9.52%]. Time per bit: 28.385 ms.
34*950^371624+1, bit: 400000 / 3676020 [10.88%]. Time per bit: 28.945 ms.
34*950^371624+1, bit: 450000 / 3676020 [12.24%]. Time per bit: 28.908 ms.
34*950^371624+1, bit: 500000 / 3676020 [13.60%]. Time per bit: 29.372 ms.
34*950^371624+1, bit: 550000 / 3676020 [14.96%]. Time per bit: 28.706 ms.
34*950^371624+1, bit: 600000 / 3676020 [16.32%]. Time per bit: 28.350 ms.
34*950^371624+1, bit: 650000 / 3676020 [17.68%]. Time per bit: 27.959 ms.
34*950^371624+1, bit: 700000 / 3676020 [19.04%]. Time per bit: 27.934 ms.
34*950^371624+1, bit: 750000 / 3676020 [20.40%]. Time per bit: 28.383 ms.
34*950^371624+1, bit: 800000 / 3676020 [21.76%]. Time per bit: 32.534 ms.
34*950^371624+1, bit: 850000 / 3676020 [23.12%]. Time per bit: 28.066 ms.
34*950^371624+1, bit: 900000 / 3676020 [24.48%]. Time per bit: 28.089 ms.
34*950^371624+1, bit: 950000 / 3676020 [25.84%]. Time per bit: 28.141 ms.
34*950^371624+1, bit: 1000000 / 3676020 [27.20%]. Time per bit: 27.929 ms.
34*950^371624+1, bit: 1050000 / 3676020 [28.56%]. Time per bit: 27.985 ms.
34*950^371624+1, bit: 1100000 / 3676020 [29.92%]. Time per bit: 32.721 ms.
34*950^371624+1, bit: 1150000 / 3676020 [31.28%]. Time per bit: 33.136 ms.
34*950^371624+1, bit: 1200000 / 3676020 [32.64%]. Time per bit: 34.413 ms.
34*950^371624+1, bit: 1250000 / 3676020 [34.00%]. Time per bit: 28.545 ms.
34*950^371624+1, bit: 1300000 / 3676020 [35.36%]. Time per bit: 28.234 ms.
34*950^371624+1, bit: 1350000 / 3676020 [36.72%]. Time per bit: 28.087 ms.
34*950^371624+1, bit: 1400000 / 3676020 [38.08%]. Time per bit: 28.518 ms.
34*950^371624+1, bit: 1450000 / 3676020 [39.44%]. Time per bit: 28.260 ms.
34*950^371624+1, bit: 1500000 / 3676020 [40.80%]. Time per bit: 28.473 ms.
34*950^371624+1, bit: 1550000 / 3676020 [42.16%]. Time per bit: 28.168 ms.
34*950^371624+1, bit: 1600000 / 3676020 [43.52%]. Time per bit: 28.243 ms.
34*950^371624+1, bit: 1650000 / 3676020 [44.88%]. Time per bit: 28.200 ms.
34*950^371624+1, bit: 1700000 / 3676020 [46.24%]. Time per bit: 28.174 ms.
34*950^371624+1, bit: 1750000 / 3676020 [47.60%]. Time per bit: 28.041 ms.
34*950^371624+1, bit: 1800000 / 3676020 [48.96%]. Time per bit: 27.959 ms.
34*950^371624+1, bit: 1850000 / 3676020 [50.32%]. Time per bit: 28.090 ms.
34*950^371624+1, bit: 1900000 / 3676020 [51.68%]. Time per bit: 27.988 ms.
34*950^371624+1, bit: 1950000 / 3676020 [53.04%]. Time per bit: 27.998 ms.
34*950^371624+1, bit: 2000000 / 3676020 [54.40%]. Time per bit: 28.242 ms.
34*950^371624+1, bit: 2050000 / 3676020 [55.76%]. Time per bit: 34.549 ms.
34*950^371624+1, bit: 2100000 / 3676020 [57.12%]. Time per bit: 29.824 ms.
34*950^371624+1, bit: 2150000 / 3676020 [58.48%]. Time per bit: 28.058 ms.
34*950^371624+1, bit: 2200000 / 3676020 [59.84%]. Time per bit: 27.972 ms.
34*950^371624+1, bit: 2250000 / 3676020 [61.20%]. Time per bit: 27.983 ms.
34*950^371624+1, bit: 2300000 / 3676020 [62.56%]. Time per bit: 29.998 ms.
34*950^371624+1, bit: 2350000 / 3676020 [63.92%]. Time per bit: 27.951 ms.
34*950^371624+1, bit: 2400000 / 3676020 [65.28%]. Time per bit: 27.958 ms.
34*950^371624+1, bit: 2450000 / 3676020 [66.64%]. Time per bit: 27.945 ms.
34*950^371624+1, bit: 2500000 / 3676020 [68.00%]. Time per bit: 28.023 ms.
34*950^371624+1, bit: 2550000 / 3676020 [69.36%]. Time per bit: 27.930 ms.
34*950^371624+1, bit: 2600000 / 3676020 [70.72%]. Time per bit: 37.645 ms.
34*950^371624+1, bit: 2650000 / 3676020 [72.08%]. Time per bit: 28.118 ms.
34*950^371624+1, bit: 2700000 / 3676020 [73.44%]. Time per bit: 28.284 ms.
34*950^371624+1, bit: 2750000 / 3676020 [74.80%]. Time per bit: 27.935 ms.
34*950^371624+1, bit: 2800000 / 3676020 [76.16%]. Time per bit: 27.985 ms.
34*950^371624+1, bit: 2850000 / 3676020 [77.52%]. Time per bit: 27.931 ms.
34*950^371624+1, bit: 2900000 / 3676020 [78.88%]. Time per bit: 27.920 ms.
34*950^371624+1, bit: 2950000 / 3676020 [80.24%]. Time per bit: 27.931 ms.
34*950^371624+1, bit: 3000000 / 3676020 [81.61%]. Time per bit: 28.055 ms.
34*950^371624+1, bit: 3050000 / 3676020 [82.97%]. Time per bit: 27.977 ms.
34*950^371624+1, bit: 3100000 / 3676020 [84.33%]. Time per bit: 28.138 ms.
34*950^371624+1, bit: 3150000 / 3676020 [85.69%]. Time per bit: 27.992 ms.
34*950^371624+1, bit: 3200000 / 3676020 [87.05%]. Time per bit: 28.095 ms.
34*950^371624+1, bit: 3250000 / 3676020 [88.41%]. Time per bit: 28.114 ms.
34*950^371624+1, bit: 3300000 / 3676020 [89.77%]. Time per bit: 28.054 ms.
34*950^371624+1, bit: 3350000 / 3676020 [91.13%]. Time per bit: 26.817 ms.
34*950^371624+1, bit: 3400000 / 3676020 [92.49%]. Time per bit: 26.749 ms.
34*950^371624+1, bit: 3450000 / 3676020 [93.85%]. Time per bit: 26.727 ms.
34*950^371624+1, bit: 3500000 / 3676020 [95.21%]. Time per bit: 26.773 ms.
34*950^371624+1, bit: 3550000 / 3676020 [96.57%]. Time per bit: 26.640 ms.
34*950^371624+1, bit: 3600000 / 3676020 [97.93%]. Time per bit: 26.718 ms.
34*950^371624+1, bit: 3650000 / 3676020 [99.29%]. Time per bit: 26.726 ms.
34*950^371624+1 is not prime. RES64: 4C839A0DD88800F7. OLD64: E58ACE29899802E0 Time : 105107.067 sec.
20:36:57 (3340): llr.exe exited; CPU time 97701.835090
20:36:57 (3340): called boinc_finish(0)
</stderr_txt>
]]>
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