Shared Volumes Slow

[dimasnake]

Expected behavior

File access in volumes should be comparable to access times in non-volumes, similarly to Linux installations of docker

Actual behavior

File access in volumes is many times slower than on non-volumes.

Information

Version: 1.12.3-beta29.2 (8280)
Channel: Beta
Sha1: 902414df0cea7fdc85b87f0077b0106c3af9f64c
Started on: 2016/11/01 21:19:46.408
Resources: C:\Program Files\Docker\Docker\Resources
OS: Windows 10 Pro
Edition: Professional
Id: 1607
Build: 14393
BuildLabName: 14393.351.amd64fre.rs1_release_inmarket.161014-1755

Steps to reproduce the behavior

Get on the commandline of a lightweight docker container

root@a6b2e82c167b:/# dd if=/dev/zero of=test.dat bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 0.569183 s, 180 MB/s

and mount a volume:

root@a6b2e82c167b:/var/www# dd if=/dev/zero of=test.dat bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 5.11662 s, 20.0 MB/s

In 9 times slower.

[friism]

Thanks for reporting. The volume mounts are implemented using a SMB share mounted over the guest/host network.

Out of curiosity, what's your development use-case that requires greater than 20 MB/s transfer-rate when using volumes?

[dimasnake]

I use docker for local web development. I have nginx, php-fpm, mysql containers. Speed website pages load very slow 5-10 sec.

It is possible to encrease volumes speed?

[xdesbieys]

I have same problem.

Inside container :

root@63d3c3f00862:/# dd if=/dev/zero of=test.dat bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 0.208075 s, 492 MB/s

Insidde container share folder :

root@63d3c3f00862:/var/lib/mysql# dd if=/dev/zero of=test.dat bs=1024 count=100000
100000+0 records in
100000+0 records out
102400000 bytes (102 MB) copied, 11.572 s, 8.8 MB/s

Docker info :

PS C:\Users\????\Docker> docker info
Containers: 4
 Running: 4
 Paused: 0
 Stopped: 0
Images: 11
Server Version: 1.12.3
Storage Driver: overlay2
 Backing Filesystem: extfs
Logging Driver: json-file
Cgroup Driver: cgroupfs
Plugins:
 Volume: local
 Network: bridge host null overlay
Swarm: inactive
Runtimes: runc
Default Runtime: runc
Security Options: seccomp
Kernel Version: 4.4.27-moby
Operating System: Alpine Linux v3.4
OSType: linux
Architecture: x86_64
CPUs: 2
Total Memory: 1.919 GiB
Name: moby
ID: DBIQ:SFE4:ZUSS:AEDJ:4KJC:ODIJ:W4L7:33D7:QUB7:OE4R:YEIE:UANK
Docker Root Dir: /var/lib/docker
Debug Mode (client): false
Debug Mode (server): true
 File Descriptors: 41
 Goroutines: 78
 System Time: 2016-11-02T12:20:15.4120124Z
 EventsListeners: 1
Registry: https://index.docker.io/v1/
WARNING: No kernel memory limit support
Experimental: true
Insecure Registries:
 127.0.0.0/8

Docker volume inspect :

PS C:\Users\????\Docker> docker volume inspect 7c27e585d8d4f55c34a34f6a47d5c0687f0851fc55765b096183f6ee327ea609
[
    {
        "Name": "7c27e585d8d4f55c34a34f6a47d5c0687f0851fc55765b096183f6ee327ea609",
        "Driver": "local",
        "Mountpoint": "/var/lib/docker/volumes/7c27e585d8d4f55c34a34f6a47d5c0687f0851fc55765b096183f6ee327ea609/_data",
        "Labels": null,
        "Scope": "local"
    }
]

Docker compose :

version: "2"
services:
    mysql:
        image: mysql:latest
        volumes:
            - ./mysql:/var/lib/mysql
        environment:
            - MYSQL_ROOT_PASSWORD=password
            - MYSQL_DATABASE=database
            - MYSQL_USER=user
            - MYSQL_PASSWORD=password
        ports:
            - "3306:3306"
    php:
        build: ./php
        image: php:fpm
        ports:
            - "9000:9000"
        links:
            - mysql
    nginx:
        build: ./nginx
        image: nginx:latest
        volumes:
            - ./nginx/website.conf:/etc/nginx/conf.d/website.conf
        ports:
            - "80:80"
        links:
            - php
    phpmyadmin:
        image: phpmyadmin/phpmyadmin
        environment:
            - PMA_HOST=mysql
            - MYSQL_USERNAME=user
            - MYSQL_ROOT_PASSWORD=password
        ports:
            - "8181:80"
        links:
            - mysql

Is it possible to use NFS of other file sharing system ?

[BlueBeN82]

Same usecase and behavior for me.

[fmasa]

@friism One of the solutions would be to allow modification of rsize&wsize parameters of smb mount. PHP projects usually consist of hundreds of small files (which have to be loaded on every request) and large rsize degrades performance for this use case.

@dimasnake Try beta 21 if you have installer, performance is much better.

[dimasnake]

@fmasa I don't have the installer. Where I can download 21 beta?

[saschanaz]

Here is a beta version of Docker for Windows but really beta 21? The latest beta has the version tag 2016-11-10 1.12.3-beta30.

[fmasa]

@saschanaz Yes. Take a look at the end of the tag (beta30)

[curlysanders]

@dimasnake @saschanaz

I found it!
Build 5971 is beta21
https://download.docker.com/win/beta/1.12.0.5971/InstallDocker.msi

Gonna restart my machine and try it.

[curlysanders]

Can't get it working. Returned to latest beta (30.1).
So frustrating, performance at work on Ubuntu is almost ten times better, while having older hardware.

[fmasa]

I read in another issue, that installer auto-updates to latest version. :/ So once you updated, you're stuck with that version.