There was a great discussion a year ago about how fast gnu's version of "yes" is. If you're unfamiliar, yes outputs y indefinitely.

yes |head -5
y
y
y
y
y

The key takeaway was that write is expensive and writing page-aligned buffers is much faster. The is true across languages, so let's see how to do it properly in go.

If you're shocked or impressed by the results, let's see you do it in your language -- post your results in the comments.

First, our benchmark C code from last-year's post.

/* yes.c - iteration 4 */
#define LEN 2
#define TOTAL …