Also this is in the debug not sure if its the same as log? But this is what happens when i run ethminer benchmark.
[2016-03-07 19:20:25] [INFO] [NICEHASH] Starting up
[2016-03-07 19:20:25] [INFO] [NICEHASH] Total RAM: 8093MB
[2016-03-07 19:20:25] [INFO] [NICEHASH] Page File Size: 8192MB
[2016-03-07 19:20:27] [INFO] [AMD_OpenCL] Platform Devices: 1
[2016-03-07 19:20:27] [INFO] [AMD_OpenCL] Detected: AMD Radeon HD 7900 Series
[2016-03-07 19:20:27] [INFO] [AMD_OpenCL] Added: AMD Radeon HD 7900 Series
[2016-03-07 19:20:27] [INFO] [DEBUG] GPU Name (Driver Ver): AMD Radeon HD 7900 Series (15.200.1062.1004)
[2016-03-07 19:20:28] [INFO] [AMD_OpenCL] Ethereum GPU MemSize: 3221225472 (GOOD!)
[2016-03-07 19:20:28] [INFO] [NICEHASH] Version get
[2016-03-07 19:20:29] [INFO] [NICEHASH] SMA get
[2016-03-07 19:20:29] [INFO] [COINBASE] Bitcoin rate get
[2016-03-07 19:20:29] [INFO] [COINBASE] Current Bitcoin rate: 413.20
[2016-03-07 19:20:29] [INFO] [NICEHASH] Balance get
[2016-03-07 19:20:30] [INFO] [NICEHASH] Setting environment variables
[2016-03-07 19:20:36] [INFO] [BENCHMARK] Benchmark starts
[2016-03-07 19:20:36] [INFO] [AMD_OpenCL] Starting benchmark: --opencl --opencl-platform 0 --gpu-memclock=1450 --gpu-engine=1185 --benchmark --benchmark-warmup 10 --benchmark-trial 20
[2016-03-07 19:20:36] [INFO] [BENCHMARK] Benchmark ends
Are you using an AMD card? If yes then for the whirlpoolx, blake256r8, blake256r14 algos, there's no demand on NiceHash and there for you can't do any benchmark as sgminer does not have any benchmark option builtin. For ethereum you would need to send the log file to [email protected] after the failed benchmark for further analysis..
Thanks.