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moby--moby/libnetwork/ipamutils/utils.go

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// Package ipamutils provides utility functions for ipam management
package ipamutils
Remove pre-defined networks from package init This moves the initialization of the pre-defined networks to where it's used instead of in package init. This reason for this change is having this be populated in `init()` causes it to always consume cpu, and memory (4.3MB of memory), to populate even if the package is unused (like for instnace, in a re-exec). Here is a memory profile of docker/docker just after starting the daemon of the top 10 largest memory consumers: Before: ``` flat flat% sum% cum cum% 0 0% 0% 11.89MB 95.96% runtime.goexit 0 0% 0% 6.79MB 54.82% runtime.main 0 0% 0% 5.79MB 46.74% main.init 0 0% 0% 4.79MB 38.67% github.com/docker/docker/api/server/router/network.init 0 0% 0% 4.79MB 38.67% github.com/docker/libnetwork.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipam.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipams/builtin.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init.1 4.29MB 34.63% 34.63% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.initGranularPredefinedNetworks ``` After: ``` flat flat% sum% cum cum% 0 0% 0% 4439.37kB 89.66% runtime.goexit 0 0% 0% 4439.37kB 89.66% runtime.main 0 0% 0% 3882.11kB 78.40% github.com/docker/docker/cli.(*Cli).Run 0 0% 0% 3882.11kB 78.40% main.main 3882.11kB 78.40% 78.40% 3882.11kB 78.40% reflect.callMethod 0 0% 78.40% 3882.11kB 78.40% reflect.methodValueCall 0 0% 78.40% 557.26kB 11.25% github.com/docker/docker/api/server.init 557.26kB 11.25% 89.66% 557.26kB 11.25% html.init 0 0% 89.66% 557.26kB 11.25% html/template.init 0 0% 89.66% 557.26kB 11.25% main.init ``` Now, of course the docker daemon will still need to consume this memory, but at least now re-execs and such won't have to re-init these variables. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2016-04-04 09:50:26 -04:00
import (
"net"
"sync"
)
var (
// PredefinedBroadNetworks contains a list of 31 IPv4 private networks with host size 16 and 12
// (172.17-31.x.x/16, 192.168.x.x/20) which do not overlap with the networks in `PredefinedGranularNetworks`
PredefinedBroadNetworks []*net.IPNet
// PredefinedGranularNetworks contains a list of 64K IPv4 private networks with host size 8
// (10.x.x.x/24) which do not overlap with the networks in `PredefinedBroadNetworks`
PredefinedGranularNetworks []*net.IPNet
Remove pre-defined networks from package init This moves the initialization of the pre-defined networks to where it's used instead of in package init. This reason for this change is having this be populated in `init()` causes it to always consume cpu, and memory (4.3MB of memory), to populate even if the package is unused (like for instnace, in a re-exec). Here is a memory profile of docker/docker just after starting the daemon of the top 10 largest memory consumers: Before: ``` flat flat% sum% cum cum% 0 0% 0% 11.89MB 95.96% runtime.goexit 0 0% 0% 6.79MB 54.82% runtime.main 0 0% 0% 5.79MB 46.74% main.init 0 0% 0% 4.79MB 38.67% github.com/docker/docker/api/server/router/network.init 0 0% 0% 4.79MB 38.67% github.com/docker/libnetwork.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipam.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipams/builtin.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init.1 4.29MB 34.63% 34.63% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.initGranularPredefinedNetworks ``` After: ``` flat flat% sum% cum cum% 0 0% 0% 4439.37kB 89.66% runtime.goexit 0 0% 0% 4439.37kB 89.66% runtime.main 0 0% 0% 3882.11kB 78.40% github.com/docker/docker/cli.(*Cli).Run 0 0% 0% 3882.11kB 78.40% main.main 3882.11kB 78.40% 78.40% 3882.11kB 78.40% reflect.callMethod 0 0% 78.40% 3882.11kB 78.40% reflect.methodValueCall 0 0% 78.40% 557.26kB 11.25% github.com/docker/docker/api/server.init 557.26kB 11.25% 89.66% 557.26kB 11.25% html.init 0 0% 89.66% 557.26kB 11.25% html/template.init 0 0% 89.66% 557.26kB 11.25% main.init ``` Now, of course the docker daemon will still need to consume this memory, but at least now re-execs and such won't have to re-init these variables. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2016-04-04 09:50:26 -04:00
initNetworksOnce sync.Once
)
// InitNetworks initializes the pre-defined networks used by the built-in IP allocator
Remove pre-defined networks from package init This moves the initialization of the pre-defined networks to where it's used instead of in package init. This reason for this change is having this be populated in `init()` causes it to always consume cpu, and memory (4.3MB of memory), to populate even if the package is unused (like for instnace, in a re-exec). Here is a memory profile of docker/docker just after starting the daemon of the top 10 largest memory consumers: Before: ``` flat flat% sum% cum cum% 0 0% 0% 11.89MB 95.96% runtime.goexit 0 0% 0% 6.79MB 54.82% runtime.main 0 0% 0% 5.79MB 46.74% main.init 0 0% 0% 4.79MB 38.67% github.com/docker/docker/api/server/router/network.init 0 0% 0% 4.79MB 38.67% github.com/docker/libnetwork.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipam.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipams/builtin.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init 0 0% 0% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.init.1 4.29MB 34.63% 34.63% 4.29MB 34.63% github.com/docker/libnetwork/ipamutils.initGranularPredefinedNetworks ``` After: ``` flat flat% sum% cum cum% 0 0% 0% 4439.37kB 89.66% runtime.goexit 0 0% 0% 4439.37kB 89.66% runtime.main 0 0% 0% 3882.11kB 78.40% github.com/docker/docker/cli.(*Cli).Run 0 0% 0% 3882.11kB 78.40% main.main 3882.11kB 78.40% 78.40% 3882.11kB 78.40% reflect.callMethod 0 0% 78.40% 3882.11kB 78.40% reflect.methodValueCall 0 0% 78.40% 557.26kB 11.25% github.com/docker/docker/api/server.init 557.26kB 11.25% 89.66% 557.26kB 11.25% html.init 0 0% 89.66% 557.26kB 11.25% html/template.init 0 0% 89.66% 557.26kB 11.25% main.init ``` Now, of course the docker daemon will still need to consume this memory, but at least now re-execs and such won't have to re-init these variables. Signed-off-by: Brian Goff <cpuguy83@gmail.com>
2016-04-04 09:50:26 -04:00
func InitNetworks() {
initNetworksOnce.Do(func() {
PredefinedBroadNetworks = initBroadPredefinedNetworks()
PredefinedGranularNetworks = initGranularPredefinedNetworks()
})
}
func initBroadPredefinedNetworks() []*net.IPNet {
pl := make([]*net.IPNet, 0, 31)
mask := []byte{255, 255, 0, 0}
for i := 17; i < 32; i++ {
pl = append(pl, &net.IPNet{IP: []byte{172, byte(i), 0, 0}, Mask: mask})
}
mask20 := []byte{255, 255, 240, 0}
for i := 0; i < 16; i++ {
pl = append(pl, &net.IPNet{IP: []byte{192, 168, byte(i << 4), 0}, Mask: mask20})
}
return pl
}
func initGranularPredefinedNetworks() []*net.IPNet {
pl := make([]*net.IPNet, 0, 256*256)
mask := []byte{255, 255, 255, 0}
for i := 0; i < 256; i++ {
for j := 0; j < 256; j++ {
pl = append(pl, &net.IPNet{IP: []byte{10, byte(i), byte(j), 0}, Mask: mask})
}
}
return pl
}