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* updated model serving, updated the config references, architecture docs and added the llm_provider section

* several documentation changes to improve sections like life_of_a_request, model serving subsystem

---------

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-261.local>
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.. _arch_model_serving:
Model Serving
-------------
Arch is a set of **two** self-contained processes that are designed to run alongside your application
servers (or on a separate host connected via a network). The first process is designated to manage low-level
networking and HTTP related comcerns, and the other process is for **model serving**, which helps Arch make
intelligent decisions about the incoming prompts. The model server is designed to call the purpose-built
:ref:`LLMs <llms_in_arch>` in Arch.
.. image:: /_static/img/arch-system-architecture.jpg
:align: center
:width: 50%
_____________________________________________________________________________________________________________
Arch' is designed to be deployed in your cloud VPC, on a on-premises host, and can work on devices that don't
have a GPU. Note, GPU devices are need for fast and cost-efficient use, so that Arch (model server, specifically)
can process prompts quickly and forward control back to the applicaton host. There are three modes in which Arch
can be configured to run its **model server** subsystem:
Local Serving (CPU - Moderate)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The following bash commands enable you to configure the model server subsystem in Arch to run local on device
and only use CPU devices. This will be the slowest option but can be useful in dev/test scenarios where GPUs
might not be available.
.. code-block:: bash
archgw up --local -cpu
Local Serving (GPU- Fast)
^^^^^^^^^^^^^^^^^^^^^^^^^
The following bash commands enable you to configure the model server subsystem in Arch to run locally on the
machine and utilize the GPU available for fast inference across all model use cases, including function calling
guardails, etc.
.. code-block:: bash
archgw up --local
Cloud Serving (GPU - Blazing Fast)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The command below instructs Arch to intelligently use GPUs locally for fast intent detection, but default to
cloud serving for function calling and guardails scenarios to dramatically improve the speed and overall performance
of your applications.
.. code-block:: bash
archgw up
.. Note::
Arch's model serving in the cloud is priced at $0.05M/token (156x cheaper than GPT-4o) with averlage latency
of 200ms (10x faster than GPT-4o). Please refer to our :ref:`getting started guide <getting_started>` to know
how to generate API keys for model serving