On Wed, Nov 23, 2016 at 4:31 PM, Mike Hommey <m...@glandium.org> wrote:
> I know OSX can be bad with I/O, but that seems unusually bad. IIRC gps
> found that there's a relatively low limit to the number of files or
> inodes that can be in cache, and a working tree of m-c alone is close
> to the limit, so changing that configuration could help.

Is this the ken.maxvnodes sysctl setting?  You can change it for your
current session with:

sudo sysctl kern.maxvnodes=$((512*1024))

You may want to experiment with higher settings depending on RAM, etc.
You can change it permanently with:

echo kern.maxvnodes=$((512*1024)) | sudo tee -a /etc/sysctl.conf

(settings per 
https://chromium.googlesource.com/chromium/src/+/master/docs/mac_build_instructions.md#Improving-performance-of)

I've found on my (several years old) Mac that changing this setting
does indeed make a significant performance difference.

-Nathan
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