/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)
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Tests finished: 5
dfArrowGlacier time: 68.95, cputime: 2.68 (3%), t8ntime: 132.37 (191%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfByzantium": (2 of 7)
100%
Tests finished: 1
dfByzantium time: 80.64, cputime: 1.81 (2%), t8ntime: 79.16 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfConstantinople": (3 of 7)
100%
Tests finished: 1
dfConstantinople time: 79.35, cputime: 1.77 (2%), t8ntime: 77.88 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfEIP2384": (4 of 7)
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66%...
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Tests finished: 3
dfEIP2384 time: 111.73, cputime: 4.22 (3%), t8ntime: 210.33 (188%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfFrontier": (5 of 7)
100%
Tests finished: 1
dfFrontier time: 79.64, cputime: 1.83 (2%), t8ntime: 78.13 (98%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfGrayGlacier": (6 of 7)
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Tests finished: 5
dfGrayGlacier time: 77.50, cputime: 2.54 (3%), t8ntime: 122.84 (158%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfHomestead": (7 of 7)
100%
Tests finished: 1
dfHomestead time: 78.93, cputime: 1.78 (2%), t8ntime: 77.44 (98%)

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

*** Execution time stats
Total Time:                               : 576.75          :   16.63 (2%)              :  778.15 (134%)
dfEIP2384                             time: 111.73   cputime:    4.22 (3%)       t8ntime:  210.33 (188%)
dfByzantium                           time: 80.64    cputime:    1.81 (2%)       t8ntime:   79.16 (98%)
dfFrontier                            time: 79.64    cputime:    1.83 (2%)       t8ntime:   78.13 (98%)
dfConstantinople                      time: 79.35    cputime:    1.77 (2%)       t8ntime:   77.88 (98%)
dfHomestead                           time: 78.93    cputime:    1.78 (2%)       t8ntime:   77.44 (98%)
dfGrayGlacier                         time: 77.50    cputime:    2.54 (3%)       t8ntime:  122.84 (158%)
dfArrowGlacier                        time: 68.95    cputime:    2.68 (3%)       t8ntime:  132.37 (191%)