Explained my changes.

Author: rrcook

README.md

@@ -1,5 +1,14 @@
 # Brc
 
+Update 1
+The main switch is from using File.stream to erlang's prim_file.
+For some reason, and I want to investigate this, is that the File.stream based approach only used 8 of 16 processors. That's on my 8 physical CPU, 16 logical CPU machine.
+
+Erlang's prim_file is very handy here. You can read a block of bytes, then at that stopping point you can read_line to get to the end of the line that could have been chopped off from the block read.
+Thanks to icedragon200 for pointing me to prim_file.
+
+Original
+
 My attempt at the billion row challenge in Elixir. 
 Elixir 1.16.0 - important because the argument order for File.stream changed between 1.15 and 1.16.
 Vanilla elixir, no extra libraries to run. I am including eflambe to run & make flamegraphs to help tune performance.