Failed to meet target (******)


#1

There is no new block mined since this morning, 8x1080ti.

And I found that there are many "Failed to meet target (******) " in my epoch_mining.log; such as :

2018-11-29 16:11:54.643 [debug] <0.29782.10>@aec_pow_cuckoo:generate:78 Generating solution for data hash <<57,205,14,227,182,46,243,231,157,114,221,14,210,171,116,27,121,214,241,245,$
2018-11-29 16:11:54.644 [info] <0.29782.10>@aec_pow_cuckoo:generate_int:183 Executing cmd: "./cuda29 -h 4F63304F34375975382B65646374304F3071743047336E5738665849353636734B4A58783939564$
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 GeForce GTX 1080 Ti with 10GB @ 352 bits x 5505MHz
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 Looking for 42-cycle on cuckoo30(“Oc0O47Yu8+edct0O0qt0G3nW8fXI566sKJXx99VF3Uo=SbfbknwQNiM=”,0) $
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 Using 3488MB of global memory.
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 nonce 0 k0 k1 k2 k3 2149a1a9981fd448 f8ad23f93ca27891 1bc681af564414b1 e19e5cc1404b012c
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 Seeding completed in 72 + 126 ms
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 44-cycle found
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 42-cycle found
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 findcycles edges 64320 time 87 ms total 896 ms
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:444 Failed to meet target (521065295)
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 Verified with cyclehash 3722cd1590baf330fc201f6743eb0d6bff155da979b232f2f0cc165c62584303
2018-11-29 16:11:56.308 [debug] <0.29782.10>@aec_pow_cuckoo:parse_generation_result:448 1 total solutions
2018-11-29 16:11:56.320 [debug] <0.29782.10>@aec_pow_cuckoo:generate_int:155 No cuckoo solution found

Is it mean that the solution can meet the target difficulty?


#2

The Cuckoo PoW is divided in two steps. The first step is trying to find a cycle (of length 42) in a graph, and the second step is checking if that cycle meets the target. So when you see in the log Failed to meet target it means you found a cycle, but that it did not meet the target.

There is a 1 in 50 chance to find a cycle, and at the current target there is a 1 in 4000 chance that the cycle meets the target. So, yes you are expected to see lots of those!


#3

I see~Thanks a lot!

The pow power is huge now~


#4

last night I found 330 solutions and also 330 times “failed to meet target”

What is wrong?

How many solutions do you have on for example on: epoch_pow_cuckoo.log.0?

Why epoch_pow_cuckoo.log.0? Because it is a full set of logs.


#5

Last night when I checked difficulty was around 12000 so 1 solution out of 12000 is good…