git tag triggers out-of-memory killer

What knobs exist inside git to restrict the amount of memory for each individual git process?

Running a large number of "git tag --sort=taggerdate --contains " processes in parallel triggers the OOM killer because each one allocates more than one gigabyte resident memory.

I tried to set all knobs from git-config(1) that appear to be related to memory usage, but nothing seems to have an effect.


Thanks,
Olaf