/data/retesteth/build/retesteth/retesteth -t DifficultyTests -- --all -j2 --nologcolor --exectimelog --clients t8ntool --testpath /data/tests 
Running tests using path: /data/tests
Running 7 test cases...
Retesteth config path: /home/ubuntu/.retesteth
Active client configurations: 't8ntool '
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfArrowGlacier": (1 of 7)
20%...
40%...
60%...
80%...
100%
Tests finished: 5
dfArrowGlacier time: 66.02, cputime: 2.70 (4%), t8ntime: 126.37 (191%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfByzantium": (2 of 7)
100%
Tests finished: 1
dfByzantium time: 78.37, cputime: 1.82 (2%), t8ntime: 76.87 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfConstantinople": (3 of 7)
100%
Tests finished: 1
dfConstantinople time: 79.16, cputime: 1.84 (2%), t8ntime: 77.65 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfEIP2384": (4 of 7)
33%...
66%...
100%
Tests finished: 3
dfEIP2384 time: 106.49, cputime: 4.35 (4%), t8ntime: 200.27 (188%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfFrontier": (5 of 7)
100%
Tests finished: 1
dfFrontier time: 77.10, cputime: 1.83 (2%), t8ntime: 75.57 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfGrayGlacier": (6 of 7)
20%...
40%...
60%...
80%...
100%
Tests finished: 5
dfGrayGlacier time: 72.79, cputime: 2.51 (3%), t8ntime: 113.97 (156%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfHomestead": (7 of 7)
100%
Tests finished: 1
dfHomestead time: 77.81, cputime: 1.81 (2%), t8ntime: 76.31 (98%)

*** No errors detected
*** Total Tests Run: 17

*** Execution time stats
Total Time:                               : 557.74          :   16.87 (3%)              :  747.01 (133%)
dfEIP2384                             time: 106.49   cputime:    4.35 (4%)       t8ntime:  200.27 (188%)
dfConstantinople                      time: 79.16    cputime:    1.84 (2%)       t8ntime:   77.65 (98%)
dfByzantium                           time: 78.37    cputime:    1.82 (2%)       t8ntime:   76.87 (98%)
dfHomestead                           time: 77.81    cputime:    1.81 (2%)       t8ntime:   76.31 (98%)
dfFrontier                            time: 77.10    cputime:    1.83 (2%)       t8ntime:   75.57 (98%)
dfGrayGlacier                         time: 72.79    cputime:    2.51 (3%)       t8ntime:  113.97 (156%)
dfArrowGlacier                        time: 66.02    cputime:    2.70 (4%)       t8ntime:  126.37 (191%)