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>Because the mysql client connection is C-based, calls to it will be
>blocking operations on greenthreads within a single process, meaning
>even if multiple greenthreads are spawned for those 200 incoming
>requests, they will be processed synchronously.

Hi Jay, can you please specify what methods in the sqlalchemy library are blocking the greenthreads in a single process?
If i call get_session multiple times during an http api request (say create_user), does it block all greenthreads on each get_session[1]? Or does the session.commit, session.begin, or session.rollback methods block all greenthreads?

[1] https://github.com/openstack/keystone/blob/master/keystone/common/sql/core.py#L217

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