code review 4279045: gob: use bufio on the decode to avoid a system call on ...

gob: use bufio on the decode to avoid a system call on each read.
Add a benchmark.
BenchmarkEndToEndPipe gives 14.3microseconds/op before,
13.1microseconds/op after, or about 76e3 round trips per second
through the kernel.
With a bytes buffer, and therefore no system calls for I/O, the
numbers go to 7.3microseconds/op, or about 137e3 round trips
per second.

[r, 2011-03-12 00:19:24]

Hello rsc (cc: golang-dev@googlegroups.com),

I'd like you to review this change to
https://go.googlecode.com/hg/

[rsc, 2011-03-12 00:20:12]

LGTM

[r, 2011-03-12 00:24:12]

*** Submitted as http://code.google.com/p/go/source/detail?r=38937f4e4d1f ***

gob: use bufio on the decode to avoid a system call on each read.
Add a benchmark.
BenchmarkEndToEndPipe gives 14.3microseconds/op before,
13.1microseconds/op after, or about 76e3 round trips per second
through the kernel.
With a bytes buffer, and therefore no system calls for I/O, the
numbers go to 7.3microseconds/op, or about 137e3 round trips
per second.

R=rsc
CC=golang-dev
http://codereview.appspot.com/4279045