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Comment by emmelaich | Hacker News Reader

I got 1.26Gb/s in Python2 on MacOS (i7 mac air)

    import os
    ys = 'y\n' * 2048
    while True:
        os.write(1, ys)

update: seems to peek at around 3gb/s with ys = 'y\n' * 2 * * 16

(had to separate the asters to stop HN swallowing them)

Plain old `yes` gets a measly 33Mb/s!!

On my Macbook with way too much running, I get about 800MiB/s in Python2 with your script, but 1.12GiB/s with this Python3 script:

    import sys
    
    s = b'y\n' * 1024
    
    write = sys.stdout.buffer.write
    while True:
        write(s)
    
    # 1.12GiB/s

Plain old yes comes in at 22Mib/s.

The Python3 docs say to "use the underlying binary buffer object" when reading or writing binary data.