If it works like mlucas (and I assume prime95), you can edit worktodo while the program is running safely, as long as you don't touch the first line.

mfaktx use file locking. Editing the file while the program it's intended for as input is risky, unless you've checked that it's well away from changing or deleting that first line. The problem is when you open the file for edit, then the program modifies or deletes the first line, then you save your manual edit of a version which does not include the program's recent change, overwriting the program's change. In gpuOwL, this could queue up a multi-day primality test of the same exponent for a second unintended run. In mfaktx it means running a bitlevel twice.

The odds of doing that even if you didn't check the status of the current run are low, as you say these tests take days and the edit could take as little as 10 seconds to paste some lines in.

[QUOTE=M344587487;481160]If it works like mlucas (and I assume prime95), you can edit worktodo while the program is running safely, as long as you don't touch the first line.[/QUOTE]

That doesn't work for prime95/mprime. The program overwrites the worktodo file on a frequent basis, and your edits will be lost.

If you merely want to append to the worktodo file, you can do so safely by creating a worktodo.add or worktodo.add.txt file, and wait for the program to detect it.

However if you want to make a general edit to the existing worktodo file without stopping the program, you have to resort to trickery, as [URL="http://mersenneforum.org/showthread.php?t=22973&p=478687"]I described here[/URL].

[QUOTE=M344587487;481202]The odds of doing that even if you didn't check the status of the current run are low, as you say these tests take days and the edit could take as little as 10 seconds to paste some lines in.[/QUOTE]

The odds of it happening are low for normal length assignments primality checking, per assignment, with a human involved directly, that may spot the consequences, or avoid the riskier time frames. The odds of it happening someday to some assignment, across the user base of mersenne gpu computing, over time, is asymptotically close to 100%. It's one thing to do it to your own assignments and output, and quite another to do it in an automation tool offered to others for managing their systems, including for programs that don't tell when their ETAs were estimated (no time stamps). Accepting some odds of data loss or corruption is why the author of Misfit faced considerable opposition from numerous commenters, to the viewpoint at one point that the odds were very low, and people had a choice whether to use what he was writing or not if they didn't like the odds.

prime95/mprime have worktodo.add functionality. (If someone of the caliber of Prime95 thought it was the best solution, who are we to argue against it?)

In the gpu mersenne application list:
gpuOwL, no worktodo.add functionality currently. Mihai is quick with code.
mfakto has it.
mfaktc V0.21 has it, 0.20 does not.
clLucas lacks it, and lacks time stamps to help tell how long one has.
CUDALucas lacks it.
CUDAPm1 lacks it and also lacks time stamps to help decipher how long one has.

Some of these need some code maintenance that they're not getting lately.

gpuOwL V1.9 treats exponent completion like an error
 

Well, not exactly. It fails to update the worktodo file on Windows 7, and resumes the same finished exponent from the last saved state at each restart. Save intervals get shorter, so successively closer approximations to finished get saved and form the restart point, until the remaining iterations < 1000, after which it makes no further progress. Scroll to the end of the post for the punch line.

Initial run
...
OK 53000000 / 77973559 [67.97%], 10.83 ms/it [10.73, 11.86] CV 1.6%, check 7.03s; ETA 3d 03:10; a44cb9751200312f [10:37:33]
OK 53500000 / 77973559 [68.61%], 10.83 ms/it [10.73, 11.57] CV 1.5%, check 7.10s; ETA 3d 01:38; d0540395bd752326 [12:07:55]
...
OK 74000000 / 77973559 [94.90%], 10.82 ms/it [10.73, 12.07] CV 1.8%, check 7.07s; ETA 0d 11:57; 4cbc7cc826a99321 [01:50:54]
OK 74500000 / 77973559 [95.54%], 10.82 ms/it [10.73, 11.48] CV 1.4%, check 7.16s; ETA 0d 10:26; f4117aa15cf457b1 [03:21:11]
OK 75000000 / 77973559 [96.19%], 10.82 ms/it [10.73, 11.89] CV 1.5%, check 7.07s; ETA 0d 08:56; a05aa9a2481c2139 [04:51:28]
OK 75500000 / 77973559 [96.83%], 10.81 ms/it [10.73, 11.54] CV 1.4%, check 7.13s; ETA 0d 07:26; 0315f2113043aff4 [06:21:42]
OK 76000000 / 77973559 [97.47%], 10.82 ms/it [10.73, 11.89] CV 1.5%, check 7.14s; ETA 0d 05:56; bf6554b0868aab6e [07:52:00]
OK 76500000 / 77973559 [98.11%], 10.82 ms/it [10.73, 11.86] CV 1.5%, check 7.10s; ETA 0d 04:26; 495d2fb883297015 [09:22:17]
OK 77000000 / 77973559 [98.75%], 10.82 ms/it [10.73, 11.87] CV 1.4%, check 7.14s; ETA 0d 02:56; 42ed3c5e197767e6 [10:52:34]
OK 77500000 / 77973559 [99.39%], 10.82 ms/it [10.72, 12.07] CV 1.8%, check 7.05s; ETA 0d 01:25; db5e8dff4f63f9a2 [12:22:53]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 10.82 ms/it [10.70, 13.07] CV 1.9%, check 7.08s; ETA 0d 00:00; e98408a6c5b314c6 [13:48:31]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 19:48:31", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...

C:\Users\ken\My Documents\gpuowl-1.9>gpuowl -user kriesel -cpu condorella-rx550 -device 1 -verbosity 2 -legacy
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2168 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 13:48:35 Central Standard Time]
Starting at iteration 77500000
OK 77500000 / 77973559 [99.39%], 0.00 ms/it; ETA 0d 00:00; db5e8dff4f63f9a2 [13:48:43]
OK 77501000 / 77973559 [99.39%], 10.75 ms/it [10.73, 10.76] CV 0.2%, check 7.10s; ETA 0d 01:25; cc1c3da9acff0d12 [13:49:00]
OK 77505000 / 77973559 [99.40%], 10.78 ms/it [10.73, 10.98] CV 0.8%, check 7.10s; ETA 0d 01:24; ed8a3a4963d47bbc [13:49:51]
OK 77510000 / 77973559 [99.40%], 10.87 ms/it [10.73, 11.67] CV 2.7%, check 7.18s; ETA 0d 01:24; 57d3742798cde521 [13:50:52]
OK 77520000 / 77973559 [99.42%], 10.81 ms/it [10.73, 11.67] CV 1.9%, check 6.99s; ETA 0d 01:22; 4610f089dd05a2c3 [13:52:47]
OK 77540000 / 77973559 [99.44%], 10.81 ms/it [10.73, 11.67] CV 1.9%, check 7.07s; ETA 0d 01:18; 020e16d8952531a0 [13:56:31]
OK 77560000 / 77973559 [99.47%], 10.83 ms/it [10.73, 11.79] CV 2.4%, check 7.00s; ETA 0d 01:15; 97885cf05c8c6640 [14:00:14]
OK 77580000 / 77973559 [99.49%], 10.81 ms/it [10.73, 11.70] CV 1.9%, check 7.05s; ETA 0d 01:11; 2abae74b7c33e12f [14:03:57]
OK 77600000 / 77973559 [99.52%], 10.80 ms/it [10.73, 11.70] CV 1.9%, check 7.11s; ETA 0d 01:07; e14d4a22e2900a96 [14:07:41]
OK 77650000 / 77973559 [99.58%], 10.83 ms/it [10.73, 11.76] CV 2.2%, check 7.05s; ETA 0d 00:58; 2693ed567d96b88e [14:16:49]
OK 77700000 / 77973559 [99.65%], 10.82 ms/it [10.73, 11.70] CV 1.9%, check 7.00s; ETA 0d 00:49; 478db28586e3130d [14:25:57]
OK 77750000 / 77973559 [99.71%], 10.82 ms/it [10.73, 11.70] CV 1.9%, check 7.18s; ETA 0d 00:40; efbc3acc73f44a04 [14:35:05]
OK 77800000 / 77973559 [99.78%], 10.82 ms/it [10.73, 11.48] CV 1.7%, check 7.13s; ETA 0d 00:31; b53e84630be1e3a8 [14:44:13]
OK 77850000 / 77973559 [99.84%], 10.81 ms/it [10.73, 11.48] CV 1.5%, check 7.21s; ETA 0d 00:22; 8068109a776dd062 [14:53:21]
OK 77900000 / 77973559 [99.91%], 10.82 ms/it [10.73, 11.48] CV 1.7%, check 7.13s; ETA 0d 00:13; ea03dd3f6f4a533c [15:02:29]
OK 77950000 / 77973559 [99.97%], 10.82 ms/it [10.73, 11.54] CV 1.7%, check 7.05s; ETA 0d 00:04; 719a047192e87fb1 [15:11:37]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 10.88 ms/it [10.73, 13.10] CV 3.5%, check 7.14s; ETA 0d 00:00; e98408a6c5b314c6 [15:16:05]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:16:05", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2262 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:16:09 Central Standard Time]
Starting at iteration 77950000
OK 77950000 / 77973559 [99.97%], 0.00 ms/it; ETA 0d 00:00; 719a047192e87fb1 [15:16:17]
OK 77951000 / 77973559 [99.97%], 10.78 ms/it [10.76, 10.79] CV 0.2%, check 6.91s; ETA 0d 00:04; 7c381f8450cf469e [15:16:34]
OK 77955000 / 77973559 [99.98%], 10.76 ms/it [10.73, 10.76] CV 0.1%, check 6.96s; ETA 0d 00:03; 5f113c76324240c7 [15:17:24]
OK 77960000 / 77973559 [99.98%], 10.87 ms/it [10.73, 11.70] CV 2.7%, check 7.03s; ETA 0d 00:03; 323d3b7e2c2c6d8e [15:18:26]
OK 77970000 / 77973559 [99.99%], 10.83 ms/it [10.73, 11.70] CV 1.9%, check 6.93s; ETA 0d 00:01; 4cd07bd3b9acd66c [15:20:21]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.17 ms/it [10.73, 13.85] CV 9.7%, check 6.86s; ETA 0d 00:00; e98408a6c5b314c6 [15:21:12]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:21:12", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2152 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:21:16 Central Standard Time]
Starting at iteration 77970000
OK 77970000 / 77973559 [99.99%], 0.00 ms/it; ETA 0d 00:00; 4cd07bd3b9acd66c [15:21:24]
OK 77971000 / 77973559 [100.00%], 10.76 ms/it [10.73, 10.79] CV 0.4%, check 7.11s; ETA 0d 00:01; 47ffe304df7e21c3 [15:21:42]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.16 ms/it [10.73, 13.17] CV 8.8%, check 7.05s; ETA 0d 00:00; e98408a6c5b314c6 [15:22:22]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:22:22", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2121 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:22:26 Central Standard Time]
Starting at iteration 77971000
OK 77971000 / 77973559 [100.00%], 0.00 ms/it; ETA 0d 00:00; 47ffe304df7e21c3 [15:22:34]
OK 77972000 / 77973559 [100.00%], 10.76 ms/it [10.76, 10.76] CV 0.0%, check 6.96s; ETA 0d 00:00; 6f690c9947ac016a [15:22:51]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.33 ms/it [10.73, 13.04] CV 10.1%, check 6.88s; ETA 0d 00:00; e98408a6c5b314c6 [15:23:21]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:23:21", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2215 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:23:25 Central Standard Time]
Starting at iteration 77972000
OK 77972000 / 77973559 [100.00%], 0.00 ms/it; ETA 0d 00:00; 6f690c9947ac016a [15:23:32]
OK 77973000 / 77973559 [100.00%], 10.76 ms/it [10.76, 10.76] CV 0.0%, check 6.96s; ETA 0d 00:00; 9649e295304fd5f8 [15:23:50]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.84 ms/it [10.79, 12.88] CV 12.5%, check 6.86s; ETA 0d 00:00; e98408a6c5b314c6 [15:24:09]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:24:09", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2246 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:24:12 Central Standard Time]
Starting at iteration 77973000
OK 77973000 / 77973559 [100.00%], 0.00 ms/it; ETA 0d 00:00; 9649e295304fd5f8 [15:24:20]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.87 ms/it [10.79, 12.95] CV 12.8%, check 6.91s; ETA 0d 00:00; e98408a6c5b314c6 [15:24:39]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:24:39", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...
gpuOwL v1.9- GPU Mersenne primality checker
Radeon 500 Series 8 @f:0.0, gfx804 1203MHz

OpenCL compilation in 2199 ms, with "-I. -cl-fast-relaxed-math -cl-std=CL2.0 -DEXP=77973559u -DWIDTH=1024u -DHEIGHT=2048u -DLOG_NWORDS=22u
-DFP_DP=1 "
PRP-3: FFT 4M (1024 * 2048 * 2) of 77973559 (18.59 bits/word) [2018-03-02 15:24:43 Central Standard Time]
Starting at iteration 77973000
OK 77973000 / 77973559 [100.00%], 0.00 ms/it; ETA 0d 00:00; 9649e295304fd5f8 [15:24:50]
CC 77973559 / 77973559, 0e6778bb1c40c1__ (raw 81a33e93fe46____)
OK 77974000 / 77973559 [100.00%], 11.93 ms/it [10.79, 13.07] CV 13.5%, check 7.07s; ETA 0d 00:00; e98408a6c5b314c6 [15:25:09]
{"exponent":77973559, "worktype":"PRP-3", "status":"C", "residue-type":1, "fft-length":"4096K", "res64":"0e6778bb1c40c1__", "program":{"name
":"gpuowl", "version":"1.9-"}, "timestamp":"2018-03-02 21:25:09", "errors":{"gerbicz":0}, "user":"kriesel", "computer":"condorella-rx550", "
aid":"C1617E65973438DFBF6797922C5E0E__"}

Bye

...

(and another 46 just like the last preceding, before I spotted it and halted it) Afterwards,
there's a worktodo.txt with the completed exponent still in it, and a worktodo-tmp.tmp without.

Git revision hash missing on Windows builds
 

Preda's posts and program output presumably all from linux include the git revision hash as part of the version, at least from v1.8.
[QUOTE=preda;471320]"gpuowl -h" outputs:


Note:
- the git revision hash is automatically included in the version number.
- a "dump" option was added, which on AMDGPU-pro and on ROCm dumps disassembled ISA in the specified folder (useful for performance tuning and debugging)[/QUOTE]
The above is from post 225 re V1.8, which includes
[CODE]"gpuowl -h" outputs:
gpuOwL v1.8-12fc090 GPU Mersenne primality checker
Command line options:[/CODE]Also, on post 320, for v2.0:
[CODE]gpuOwL v2.0-6ab41b2 GPU Mersenne primality checker

Command line options:
[/CODE]Note that on the Windows builds kracker so helpfully provided, the git revision hashes are omitted by the program from every run:
[CODE]gpuOwL v1.9- GPU Mersenne primality checker
Command line options:

-size 2M|4M|8M : override FFT size.
-fft DP|SP|M61|M31 : choose FFT variant [default DP]:
DP : double precision floating point.
SP : single precision floating point.
M61 : Fast Galois Transform (FGT) modulo M(61).
M31 : FGT modulo M(31).
-user <name> : specify the user name.
-cpu <name> : specify the hardware name.
-legacy : use legacy kernels
-dump <path> : dump compiled ISA to the folder <path> that must exist.
-verbosity <level> : change amount of information logged. [0-2, default 0].
-device <N> : select specific device among:
0 : Intel(R) HD Graphics 620, 24x1050MHz
1 : Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz, 4x2700MHz
[/CODE]

Bug and wish list
 

Attached is my take on known issues and desirable feature additions, relating to Windows builds of gpuOwL. I'm very appreciative of the fast turnaround the first two had; two days from posting them, to being able to test they were resolved.

As always, such lists are in appreciation of the authors' past contributions. Users may want to browse this for workarounds included in some of the descriptions, and for an awareness of some known pitfalls. Please respond with any comments, additions or suggestions you may have.

In this case, I've omitted most content prior to V1.9, to save myself some time, and because there have been some quite significant transitions in the program's history.

gpuOwL appears to have no limit on retries on an error computation
 

After approximately 3.5 hours of retrying the same iterations, near the boundary of what can be done with the -fft M61 -size 4M transform, gpuOwL V1.9-74f1a38 on Windows futilely continued retrying the same 1000 iterations until manually stopped:. Almost all the error count was for the same 1000 iteration interval:[CODE]OK 1300000 / 83871551 [ 1.55%], 19.01 ms/it [18.91, 19.97] CV 1.4%, check 10.90s; ETA 18d 03:56; 603b652f020b1cd6 [06:41:49]
EE 1350000 / 83871551 [ 1.61%], 18.99 ms/it [18.91, 20.37] CV 1.3%, check 10.87s; ETA 18d 03:20; d1e7b95acdc04b53 [06:57:50]
EE 1310000 / 83871551 [ 1.56%], 19.00 ms/it [18.91, 19.97] CV 1.3%, check 11.06s; ETA 18d 03:43; 9095913cfe7f7761 [07:01:11] (1 errors)
EE 1310000 / 83871551 [ 1.56%], 19.02 ms/it [18.91, 19.97] CV 1.7%, check 10.87s; ETA 18d 04:19; 9095913cfe7f7761 [07:04:32] (2 errors)
OK 1305000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.97] CV 0.1%, check 10.83s; ETA 18d 02:03; 9a1130d2d33d4b25 [07:06:17] (3 errors)
EE 1310000 / 83871551 [ 1.56%], 19.02 ms/it [18.91, 19.97] CV 1.7%, check 10.80s; ETA 18d 04:19; 9095913cfe7f7761 [07:08:03] (3 errors)
EE 1310000 / 83871551 [ 1.56%], 18.97 ms/it [18.91, 19.34] CV 0.7%, check 10.86s; ETA 18d 02:58; 9095913cfe7f7761 [07:09:49] (4 errors)
EE 1310000 / 83871551 [ 1.56%], 19.07 ms/it [18.91, 19.94] CV 1.7%, check 10.90s; ETA 18d 05:23; 9095913cfe7f7761 [07:11:35] (5 errors)
EE 1310000 / 83871551 [ 1.56%], 19.03 ms/it [18.91, 19.94] CV 1.7%, check 10.86s; ETA 18d 04:28; 9095913cfe7f7761 [07:13:21] (6 errors)
EE 1310000 / 83871551 [ 1.56%], 18.97 ms/it [18.91, 19.34] CV 0.7%, check 10.90s; ETA 18d 03:02; 9095913cfe7f7761 [07:15:07] (7 errors)
EE 1310000 / 83871551 [ 1.56%], 19.03 ms/it [18.91, 19.97] CV 1.7%, check 10.86s; ETA 18d 04:23; 9095913cfe7f7761 [07:16:53] (8 errors)
EE 1310000 / 83871551 [ 1.56%], 18.92 ms/it [18.91, 18.97] CV 0.1%, check 10.94s; ETA 18d 01:57; 9095913cfe7f7761 [07:18:39] (9 errors)
EE 1310000 / 83871551 [ 1.56%], 19.02 ms/it [18.91, 20.00] CV 1.8%, check 10.89s; ETA 18d 04:19; 9095913cfe7f7761 [07:20:25] (10 errors)
EE 1310000 / 83871551 [ 1.56%], 19.03 ms/it [18.91, 19.94] CV 1.7%, check 10.90s; ETA 18d 04:28; 9095913cfe7f7761 [07:22:11] (11 errors)
EE 1310000 / 83871551 [ 1.56%], 18.96 ms/it [18.91, 19.34] CV 0.7%, check 10.92s; ETA 18d 02:53; 9095913cfe7f7761 [07:23:56] (12 errors)
EE 1310000 / 83871551 [ 1.56%], 19.02 ms/it [18.91, 19.97] CV 1.7%, check 10.83s; ETA 18d 04:19; 9095913cfe7f7761 [07:25:42] (13 errors)
EE 1310000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.97] CV 0.1%, check 11.37s; ETA 18d 02:01; 9095913cfe7f7761 [07:27:28] (14 errors)
OK 1306000 / 83871551 [ 1.56%], 18.94 ms/it [18.91, 18.97] CV 0.2%, check 10.90s; ETA 18d 02:19; 5defac09def8189c [07:27:58] (15 errors)
EE 1308000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.97] CV 0.2%, check 10.83s; ETA 18d 02:08; b48a2300adff8c2d [07:28:47] (15 errors)
EE 1308000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.97] CV 0.2%, check 10.80s; ETA 18d 02:08; b48a2300adff8c2d [07:29:36] (16 errors)
EE 1308000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.97] CV 0.2%, check 11.32s; ETA 18d 02:08; b48a2300adff8c2d [07:30:25] (17 errors)
...
EE 1308000 / 83871551 [ 1.56%], 18.93 ms/it [18.91, 18.94] CV 0.1%, check 11.29s; ETA 18d 02:09; b48a2300adff8c2d [08:14:24] (71 errors)
EE 1308000 / 83871551 [ 1.56%], 19.04 ms/it [18.91, 19.34] CV 1.1%, check 10.83s; ETA 18d 04:39; b48a2300adff8c2d [08:15:13] (72 errors)
OK 1307000 / 83871551 [ 1.56%], 18.94 ms/it [18.91, 18.97] CV 0.2%, check 10.83s; ETA 18d 02:19; 5ab9690c68abb184 [08:15:43] (73 errors)
EE 1308000 / 83871551 [ 1.56%], 18.94 ms/it [18.91, 18.97] CV 0.2%, check 10.89s; ETA 18d 02:19; b48a2300adff8c2d [08:16:13] (73 errors)
EE 1308000 / 83871551 [ 1.56%], 18.94 ms/it [18.94, 18.94] CV 0.0%, check 10.83s; ETA 18d 02:20; b48a2300adff8c2d [08:16:43] (74 errors)
...
EE 1308000 / 83871551 [ 1.56%], 18.94 ms/it [18.94, 18.94] CV 0.0%, check 10.89s; ETA 18d 02:20; b48a2300adff8c2d [10:25:23] (332 errors)
EE 1308000 / 83871551 [ 1.56%], 18.94 ms/it [18.94, 18.94] CV 0.0%, check 10.94s; ETA 18d 02:20; b48a2300adff8c2d [10:25:53] (333 errors)
EE 1308000 / 83871551 [ 1.56%], 19.45 ms/it [18.91, 20.00] CV 4.0%, check 10.87s; ETA 18d 14:07; b48a2300adff8c2d [10:26:23] (334 errors)
EE 1308000 / 83871551 [ 1.56%], 18.94 ms/it [18.91, 18.97] CV 0.2%, check 10.84s; ETA 18d 02:19; b48a2300adff8c2d [10:26:53] (335 errors)
EE 1308000 / 83871551 [ 1.56%], 18.97 ms/it [18.97, 18.97] CV 0.0%, check 10.90s; ETA 18d 03:01; b48a2300adff8c2d [10:27:23] (336 errors)
EE 1308000 / 83871551 [ 1.56%], 19.16 ms/it [18.97, 19.34] CV 1.4%, check 10.90s; ETA 18d 07:20; b48a2300adff8c2d [10:27:53] (337 errors)[/CODE]

Is there going to be a Windows build on version 2.0 which have 5M FFT?

Meaning of the -step argument ?
 

What is the use of the -step argument in gpuOwl ?