.

Makefile

@@ -17,7 +17,7 @@ bench_go : t_syspread_go $(XDAT) t_copy_go
 	./t_syspread_go $(XDAT) >t_syspread_go.csv
 	./t_copy_go >t_copy_go.csv
 
-N	= 5
+N	= 10
 bench_gov: syspread_test.go
 	>go14.txt; for i in `seq $N`; do go14 test -bench . $< >>go14.txt; done
 	>go15.txt; for i in `seq $N`; do go15 test -bench . $< >>go15.txt; done

go14.txt

+PASS
+BenchmarkPread1	 5000000	       269 ns/op
+ok  	command-line-arguments	1.660s
+PASS
+BenchmarkPread1	 5000000	       269 ns/op
+ok  	command-line-arguments	1.637s
+PASS
+BenchmarkPread1	 5000000	       269 ns/op
+ok  	command-line-arguments	1.639s
+PASS
+BenchmarkPread1	 5000000	       270 ns/op
+ok  	command-line-arguments	1.644s
+PASS
+BenchmarkPread1	 5000000	       271 ns/op
+ok  	command-line-arguments	1.649s

go15.txt

+PASS
+BenchmarkPread1-4	 5000000	       276 ns/op
+ok  	command-line-arguments	1.672s
+PASS
+BenchmarkPread1-4	 5000000	       276 ns/op
+ok  	command-line-arguments	1.678s
+PASS
+BenchmarkPread1-4	 5000000	       276 ns/op
+ok  	command-line-arguments	1.666s
+PASS
+BenchmarkPread1-4	 5000000	       278 ns/op
+ok  	command-line-arguments	1.679s
+PASS
+BenchmarkPread1-4	 5000000	       275 ns/op
+ok  	command-line-arguments	1.664s

go16.txt

+PASS
+BenchmarkPread1-4	 5000000	       277 ns/op
+ok  	command-line-arguments	1.680s
+PASS
+BenchmarkPread1-4	 5000000	       276 ns/op
+ok  	command-line-arguments	1.671s
+PASS
+BenchmarkPread1-4	 5000000	       280 ns/op
+ok  	command-line-arguments	1.690s
+PASS
+BenchmarkPread1-4	 5000000	       275 ns/op
+ok  	command-line-arguments	1.666s
+PASS
+BenchmarkPread1-4	 5000000	       275 ns/op
+ok  	command-line-arguments	1.668s

go17.txt

-BenchmarkPread1-4   	 5000000	       274 ns/op
-PASS
-ok  	command-line-arguments	1.655s
-BenchmarkPread1-4   	 5000000	       273 ns/op
-PASS
-ok  	command-line-arguments	1.649s
 BenchmarkPread1-4   	 5000000	       271 ns/op
 PASS
-ok  	command-line-arguments	1.640s
-BenchmarkPread1-4   	 5000000	       271 ns/op
+ok  	command-line-arguments	1.638s
+BenchmarkPread1-4   	 5000000	       272 ns/op
 PASS
-ok  	command-line-arguments	1.637s
+ok  	command-line-arguments	1.642s
 BenchmarkPread1-4   	 5000000	       270 ns/op
 PASS
-ok  	command-line-arguments	1.637s
+ok  	command-line-arguments	1.633s
+BenchmarkPread1-4   	 5000000	       273 ns/op
+PASS
+ok  	command-line-arguments	1.648s
+BenchmarkPread1-4   	 5000000	       272 ns/op
+PASS
+ok  	command-line-arguments	1.649s

go18.txt

 BenchmarkPread1-4   	 5000000	       261 ns/op
 PASS
 ok  	command-line-arguments	1.581s
-BenchmarkPread1-4   	 5000000	       262 ns/op
+BenchmarkPread1-4   	 5000000	       264 ns/op
 PASS
-ok  	command-line-arguments	1.585s
-BenchmarkPread1-4   	 5000000	       262 ns/op
+ok  	command-line-arguments	1.597s
+BenchmarkPread1-4   	 5000000	       263 ns/op
 PASS
-ok  	command-line-arguments	1.583s
-BenchmarkPread1-4   	 5000000	       262 ns/op
+ok  	command-line-arguments	1.588s
+BenchmarkPread1-4   	 5000000	       263 ns/op
 PASS
-ok  	command-line-arguments	1.583s
-BenchmarkPread1-4   	 5000000	       261 ns/op
+ok  	command-line-arguments	1.588s
+BenchmarkPread1-4   	 5000000	       262 ns/op
 PASS
-ok  	command-line-arguments	1.580s
+ok  	command-line-arguments	1.589s

gotip.txt

@@ -2,24 +2,24 @@ goos: linux
 goarch: amd64
 BenchmarkPread1-4   	 5000000	       323 ns/op
 PASS
-ok  	command-line-arguments	1.952s
+ok  	command-line-arguments	1.951s
 goos: linux
 goarch: amd64
 BenchmarkPread1-4   	 5000000	       323 ns/op
 PASS
-ok  	command-line-arguments	1.953s
+ok  	command-line-arguments	1.951s
 goos: linux
 goarch: amd64
-BenchmarkPread1-4   	 5000000	       322 ns/op
+BenchmarkPread1-4   	 5000000	       323 ns/op
 PASS
-ok  	command-line-arguments	1.946s
+ok  	command-line-arguments	1.953s
 goos: linux
 goarch: amd64
-BenchmarkPread1-4   	 5000000	       327 ns/op
+BenchmarkPread1-4   	 5000000	       323 ns/op
 PASS
-ok  	command-line-arguments	1.979s
+ok  	command-line-arguments	1.952s
 goos: linux
 goarch: amd64
-BenchmarkPread1-4   	 5000000	       324 ns/op
+BenchmarkPread1-4   	 5000000	       325 ns/op
 PASS
-ok  	command-line-arguments	1.957s
+ok  	command-line-arguments	1.964s

gov.txt

-name \ time/op  go17.txt    go18.txt    gotip.txt
-Pread1-4        272ns ± 1%  262ns ± 0%  324ns ± 1%
+name \ time/op  go14.txt    go15.txt    go16.txt    go17.txt    go18.txt    gotip.txt
+Pread1          270ns ± 1%
+Pread1-4                    276ns ± 1%  277ns ± 1%  272ns ± 1%  263ns ± 1%  323ns ± 0%