I felt guilty about leaving 2% on the table in CL 108878,
so I thought I'd get it a different way.
Teach readFile to accept a re-usable bytes.Buffer to read into,
to reduce the amount of garbage created.
To limit the possible memory impact of giant files,
only re-use the buffer for the duration of a single package.
Even that is enough to help.
name old time/op new time/op delta
Referrers 4.67s ± 3% 4.58s ± 2% -1.96% (p=0.029 n=10+10)
name old user-time/op new user-time/op delta
Referrers 16.5s ± 3% 15.8s ± 1% -4.39% (p=0.000 n=10+8)
name old sys-time/op new sys-time/op delta
Referrers 16.1s ± 3% 15.9s ± 3% ~ (p=0.218 n=10+10)
This work supported by Sourcegraph.
Change-Id: I594ef25c0fd5ccb766ff5b98dbbd1a75a7a4f957
Reviewed-on: https://go-review.googlesource.com/108935
Reviewed-by: Alan Donovan <adonovan@google.com>
5c8013c561