Git push - suboptimal pack - out of memory

git config --global pack.threads 1

The following command fixed the issue for me:

git config --global pack.windowMemory 256m

This affects effectiveness of delta compression so you might want to try a bigger size first, something like 1g, depending on your hardware and bandwidth.

More details here: https://www.kernel.org/pub/software/scm/git/docs/git-pack-objects.html

1. May be git is suboptimal tool for handling large amount of big blobs.
2. You can disable multi-threaded compression to save memory: git config pack.threads 1 (in addition to other memory limiting options, like core.bigfilethreshold in newer Git)