/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: 68.42, cputime: 2.86 (4%), t8ntime: 130.58 (190%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfByzantium": (2 of 7)
100%
Tests finished: 1
dfByzantium time: 86.18, cputime: 2.50 (2%), t8ntime: 84.01 (97%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfConstantinople": (3 of 7)
100%
Tests finished: 1
dfConstantinople time: 84.33, cputime: 2.47 (2%), t8ntime: 82.18 (97%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfEIP2384": (4 of 7)
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Tests finished: 3
dfEIP2384 time: 114.83, cputime: 4.56 (3%), t8ntime: 216.20 (188%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfFrontier": (5 of 7)
100%
Tests finished: 1
dfFrontier time: 88.74, cputime: 2.59 (2%), t8ntime: 86.50 (97%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfGrayGlacier": (6 of 7)
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Tests finished: 5
dfGrayGlacier time: 81.85, cputime: 2.90 (3%), t8ntime: 127.56 (155%)
Running tests for config 'Ethereum GO on StateTool' 2
Test Case "dfHomestead": (7 of 7)
100%
Tests finished: 1
dfHomestead time: 88.71, cputime: 2.58 (2%), t8ntime: 86.46 (97%)

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

*** Execution time stats
Total Time:                               : 613.05          :   20.47 (3%)              :  813.49 (132%)
dfEIP2384                             time: 114.83   cputime:    4.56 (3%)       t8ntime:  216.20 (188%)
dfFrontier                            time: 88.74    cputime:    2.59 (2%)       t8ntime:   86.50 (97%)
dfHomestead                           time: 88.71    cputime:    2.58 (2%)       t8ntime:   86.46 (97%)
dfByzantium                           time: 86.18    cputime:    2.50 (2%)       t8ntime:   84.01 (97%)
dfConstantinople                      time: 84.33    cputime:    2.47 (2%)       t8ntime:   82.18 (97%)
dfGrayGlacier                         time: 81.85    cputime:    2.90 (3%)       t8ntime:  127.56 (155%)
dfArrowGlacier                        time: 68.42    cputime:    2.86 (4%)       t8ntime:  130.58 (190%)