io, net, http: sendfile support
Speeds up static fileserver, avoiding kernel/userspace copies.
Numbers: downloading 14 MB AppEngine Go SDK with ab (Apache Bench)
with 5 threads:
Before/after numbers:
CPU:
user 0m3.910s
sys 0m23.650s
->
user 0m0.720s
sys 0m4.890s
Time taken for tests: 8.906 seconds
->
Time taken for tests: 8.545 seconds
Percentage of the requests served within a certain time (ms)
50% 44
66% 45
75% 46
80% 46
90% 48
95% 51
98% 59
99% 71
100 74 (longest request)
->
50% 42
66% 43
75% 43
80% 44
90% 46
95% 57
98% 62
99% 63
100% 64 (longest request)
R=iant, gary.burd, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/4543071
diff --git a/src/pkg/net/sendfile_stub.go b/src/pkg/net/sendfile_stub.go
new file mode 100644
index 0000000..43e8104
--- /dev/null
+++ b/src/pkg/net/sendfile_stub.go
@@ -0,0 +1,14 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package net
+
+import (
+ "io"
+ "os"
+)
+
+func sendFile(c *netFD, r io.Reader) (n int64, err os.Error, handled bool) {
+ return 0, nil, false
+}
