Improve the s3 uploader for better performance.

Signed-off-by: dkkb <dabkb@aol.com>

pkg/simple/client/s3/s3_test.go

@@ -0,0 +1,14 @@
+package s3
+
+import (
+	"testing"
+
+	"gotest.tools/assert"
+)
+
+func TestCalculateConcurrency(t *testing.T) {
+	assert.Equal(t, 5, calculateConcurrency(1*1024*1024))
+	assert.Equal(t, 5, calculateConcurrency(5*1024*1024))
+	assert.Equal(t, 20, calculateConcurrency(99*1024*1024))
+	assert.Equal(t, 128, calculateConcurrency(129*5*1024*1024))
+}