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Cannot reproduce benchmarks

xpslinux :: ~ » uname -a
Linux xpslinux 5.2.1-1-MANJARO #1 SMP PREEMPT Mon Jul 15 04:50:55 UTC 2019 x86_64 GNU/Linux
xpslinux :: ~ » go version
go version go1.12.7 linux/amd64
xpslinux :: ~ » cat /proc/cpuinfo | grep model
model		: 142
model name	: Intel(R) Core(TM) i7-7560U CPU @ 2.40GHz
model		: 142
model name	: Intel(R) Core(TM) i7-7560U CPU @ 2.40GHz
BenchmarkUint64n-2                    	  500000	      2658 ns/op	       0 B/op	       0 allocs/op
BenchmarkUint64nLarge-2               	  300000	      5366 ns/op	       0 B/op	       0 allocs/op
BenchmarkIntn-2                       	  500000	      2685 ns/op	       0 B/op	       0 allocs/op
BenchmarkIntnLarge-2                  	  500000	      3629 ns/op	       0 B/op	       0 allocs/op
BenchmarkBigIntn-2                    	  500000	      3673 ns/op	      56 B/op	       4 allocs/op
BenchmarkBigIntnLarge-2               	  200000	      7313 ns/op	     232 B/op	       4 allocs/op
BenchmarkBigCryptoInt-2               	 1000000	      2137 ns/op	      56 B/op	       4 allocs/op
BenchmarkBigCryptoIntLarge-2          	  300000	      3732 ns/op	     232 B/op	       4 allocs/op
BenchmarkPerm32-2                     	   20000	     87851 ns/op	     256 B/op	       1 allocs/op
BenchmarkPermLarge4k-2                	     100	  10898560 ns/op	   32768 B/op	       1 allocs/op
BenchmarkShuffle32-2                  	   20000	     88629 ns/op	       0 B/op	       0 allocs/op
BenchmarkShuffleLarge4k-2             	     100	  11418173 ns/op	       0 B/op	       0 allocs/op
BenchmarkRead32-2                     	  500000	      2898 ns/op	  11.04 MB/s	       0 B/op	       0 allocs/op
BenchmarkRead512kb-2                  	     100	  16492573 ns/op	  31.04 MB/s	    5160 B/op	       0 allocs/op
BenchmarkRead4Threads32-2             	  200000	      9707 ns/op	  13.19 MB/s	       0 B/op	       0 allocs/op
BenchmarkRead4Threads512kb-2          	      30	  39077591 ns/op	  52.41 MB/s	   34406 B/op	       0 allocs/op
BenchmarkRead64Threads32-2            	   10000	    169407 ns/op	  12.09 MB/s	       0 B/op	       0 allocs/op
BenchmarkRead64Threads512kb-2         	       2	 653405206 ns/op	  50.15 MB/s	 6193152 B/op	      12 allocs/op
BenchmarkReadCrypto32-2               	 1000000	      1252 ns/op	  25.55 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadCrypto512kb-2            	     500	   2663683 ns/op	 192.22 MB/s	    1032 B/op	       0 allocs/op
BenchmarkReadCrypto4Threads32-2       	  200000	      7517 ns/op	  17.03 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadCrypto4Threads512kb-2    	     100	  12498406 ns/op	 163.86 MB/s	   15521 B/op	       0 allocs/op
BenchmarkReadCrypto64Threads32-2      	   10000	    122872 ns/op	  16.67 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadCrypto64Threads512kb-2   	      10	 201337692 ns/op	 162.75 MB/s	  108412 B/op	      11 allocs/op
BenchmarkReadMath32-2                 	 1000000	      1828 ns/op	  17.50 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadMath512kb-2              	     100	  22226200 ns/op	  23.04 MB/s	    5160 B/op	       0 allocs/op
BenchmarkReadMath4Threads32-2         	  200000	      9045 ns/op	  14.15 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadMath4Threads512kb-2      	      20	  84407905 ns/op	  24.26 MB/s	   51609 B/op	       0 allocs/op
BenchmarkReadMath64Threads32-2        	   10000	    178887 ns/op	  11.45 MB/s	       0 B/op	       0 allocs/op
BenchmarkReadMath64Threads512kb-2     	       1	1532074219 ns/op	  21.39 MB/s	 1032192 B/op	       2 allocs/op