Docker performance on ubuntu host 2x+ worse than OSX host

问题

Ok, let's start over after a bunch of investigation. Here is what we know:

Ubuntu host

15.04 on i7 3820 (quad 3.6) and Samsung 850 pro SSD 512gb SATA 6

$ docker info
Containers: 2
Images: 101
Storage Driver: overlay
 Backing Filesystem: extfs
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 3.19.0-28-generic
Operating System: Ubuntu 15.04
CPUs: 8
Total Memory: 15.61 GiB
Name: camacho
ID: ZOYN:QGDO:UGMJ:TDDM:WEEM:ZEHJ:4OKB:V5WR:RGCL:NOKG:F5W5:SDEL
WARNING: No swap limit support

OSX host

10.10.5 on i7 (quad 2.7) and Apple SSD 512gb SD512E SATA 6 (2+ years old)

$ docker info
Containers: 3
Images: 185
Storage Driver: aufs
 Root Dir: /mnt/sda1/var/lib/docker/aufs
 Backing Filesystem: extfs
 Dirs: 191
 Dirperm1 Supported: true
Execution Driver: native-0.2
Logging Driver: json-file
Kernel Version: 4.0.9-boot2docker
Operating System: Boot2Docker 1.8.1 (TCL 6.3); master : 7f12e95 - Thu Aug 13 03:24:56 UTC 2015
CPUs: 8
Total Memory: 3.858 GiB
Name: dinghy
ID: PNNP:PI3E:CRUK:27RI:IPHW:HROF:NQA2:XKV6:VGCZ:WT7B:BZ7R:USWD
Debug mode (server): true
File Descriptors: 21
Goroutines: 54
System Time: 2015-09-24T19:16:01.715069994Z
EventsListeners: 1
Init SHA1: 
Init Path: /usr/local/bin/docker
Docker Root Dir: /mnt/sda1/var/lib/docker
Labels:
 provider=virtualbox

Observations

1. dockerized rspec running 2x+ faster on OSX
2. sysbench io results are terrible on Ubuntu
3. dockerized iozone results are as expected (ubuntu slightly faster)
4. hardware check complete, ubuntu host is on a SATA 6 cable and port

iozone results

docker run -it threadx/docker-ubuntu-iozone
$ iozone -R -l 5 -u 5 -r 4k -s 100m -F /home/f1 /home/f2 /home/f3 /home/f4 /home/f5 | tee -a /tmp/iozone_results.txt &

Summary

I'm dockerizing our test process because we need stability and concurrency. We've done a bunch of work to limit test times, and a 2x increase in times is a terrible step backwards.

Sysbench shows the ubuntu host performing 4x worse than OSX, and I have no understanding of that. dd and iozone tests show the ubuntu host to be performing as expected.

Question

Why is my rspec performance worse on the ubuntu host which has faster resources? Where should I investigate? Is sysbench io test an indicator or an anomaly? What are sources of bad performance in dockerized ubuntu?

回答1:

The difference is PCIe vs SATA 6 interfaces. The latest generation of Macbook Pro PCIe is even faster.

来源：https://stackoverflow.com/questions/32617243/docker-performance-on-ubuntu-host-2x-worse-than-osx-host