I am using docker for all my development. I used to have a ubuntu laptop for my primary development machine, now I switched to Mac. Performance is much slower on Mac though. For an app i managed to bind the volume as read-only as the PHP app is sandboxed and does not write to disk.

Expected behavior Performance equal to docker-machine Actual behavior Much slower than docker-machine Information Using docker-compose to start and run a mysql container. Running a Rails application natively on OSX host. When running Rails migrations, against the dockerized mysql container, I'm getting massive performance differences between docker-for-mac and docker-machine (using virtualbox) Docker-for-Mac: real 10m29.800s user 0m11.336s sys 0m3.192s docker-machine: real 0m32.145s user 0m9.637s sys 0m2.719s That is a 20x performance difference. Is this caused by xhyve limitations? Should we expect docker-for-mac performance issues to be addressed?

The performance issues, unfortunately, are stopping us from using docker for local development on OSX. I can confirm that I'm also seeing MAJOR performance issues when comparing Docker for Mac and Docker Machine. Information I actually tried three different configurations: • Node 6 app locally on OS X Yosemite, Redis and Postgres on Docker Machine • Node 6 app, Redis and Postgres all running on Docker Machine • Node 6 app, Redis and Postgres all running on Docker for Mac I ran a test suite that contains a little over 300 tests. Here are my results: Config 1 (Local + Docker Machine): ~5 minutes Config 2 (Docker Machine): ~7 minutes Config 3 (Docker for Mac): ~18 Minutes Versions: running Docker Toolbox 1.12 and Docker for Mac 1.12.

Are you a Linux user who switched to Mac when you saw that Docker is now available as a native Mac app? Or maybe you’ve heard how great Docker is and you want to give it a try? Did you think that you could just take your Docker Compose file, launch your project and have everything work out for you? Well you were right. Docker for Mac is a pretty smart invention. It gives you the whole Docker API available from the terminal, even though Docker itself wasn’t created to work on Macs.

To make all this possible, a light Alpine Linux image is fired up underneath with xhyve MacOS native virtualization. Because of this, you need to allocate CPU cores and RAM for the VM. Things won’t be as close to bare metal as they are in Linux. If you are – for example – a Java developer who uses Docker to run compiled jar, you may even not notice the difference. At least, as long as you don’t try to do any heavy database work. Docker for Mac and full sync on flush issue First, let’s look at MacOS: “For applications that require tighter guarantees about the integrity of their data, Mac OS X provides the F_FULLFSYNC fcntl.

The F_FULLFSYNC fcntl asks the drive to flush all buffered data to permanent storage. Applications, such as databases, that require a strict ordering of writes should use F_FULLFSYNC to ensure that their data is written in the order they expect.” In short – to keep our data safe – every change made in the database needs to be stored on disk in an exact order.

This will guarantee that during power loss or any unexpected event your data will be safe. Actually, this make sense. IF you decide to setup a database inside Docker for Mac on a production environment However In most cases, though, you’ll be using your machine for dev purposes, where you don’t care to recreate database from fixtures. If you have a Macbook, even power loss isn’t a threat. In this case, you may decide to disable this behaviour as F_FULLFSYNC has a negative performance drawback in Docker for Mac While reading about Docker issues on Github, I found a solution provided.

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Things will get a lot faster when you type those few lines into your terminal: $ cd ~/Library/Containers/com.docker.docker/Data/database/ $ git reset --hard HEAD is now at cafabd0 Docker started $ cat com.docker.driver.amd64-linux/disk/full-sync-on-flush true $ echo false > com.docker.driver.amd64-linux/disk/full-sync-on-flush $ git add com.docker.driver.amd64-linux/disk/full-sync-on-flush $ git commit -s -m 'Disable flushing' [master dc32fcc] Disable flushing 1 file changed, 1 insertion(+), 1 deletion(-) Actually, someone even placed to make things easier. Does it really work, you’ll ask? I created a to check this. Activity app for mac. This test uses a standard Docker MySQL image without tweaks, and an image with sysbench installed. In my test case, I decided to use one thread (I only allocated 1 core for Docker on my Macbook) and a table with 10000 rows.