.

Makefile

@@ -17,6 +17,16 @@ 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
+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
+	>go16.txt; for i in `seq $N`; do go16 test -bench . $< >>go16.txt; done
+	>go17.txt; for i in `seq $N`; do go17 test -bench . $< >>go17.txt; done
+	>go18.txt; for i in `seq $N`; do go18 test -bench . $< >>go18.txt; done
+	>gotip.txt; for i in `seq $N`; do go test -bench . $< >>gotip.txt; done
+	benchstat go14.txt go15.txt go16.txt go17.txt go18.txt gotip.txt >gov.txt
+
 t_syspread_go: t_syspread_go.go
 	go build $<
 

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
+PASS
+ok  	command-line-arguments	1.637s
+BenchmarkPread1-4   	 5000000	       270 ns/op
+PASS
+ok  	command-line-arguments	1.637s

go18.txt

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

gotip.txt

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

gov.txt

+name \ time/op  go17.txt    go18.txt    gotip.txt
+Pread1-4        272ns ± 1%  262ns ± 0%  324ns ± 1%