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COMFYUI · GPU · WORKFLOW · REST · WEBSOCKET

ComfyUI GPU Server: Running a Workflow Is Not the Same as Multi-User Production Service

ComfyUI can run node-based generative-AI workflows locally or on remote GPUs and accept workflows programmatically through its server API. In production, queue behavior, model files, custom-node security, output storage and user isolation matter alongside VRAM.

gpu / 2026
01REST API
02WebSocket
03Prompt Queue
04VRAM
Updated · 18.08.2026
01
On this page

Can ComfyUI run through an API without opening the browser?

Yes. Current ComfyUI server documentation shows workflows can be submitted over HTTP, outputs retrieved and real-time execution progress followed over WebSocket. Workflows should be exported in API format for programmatic use.

On this pageComfyUI GPU Server: Running a Workflow Is Not the Same as Multi-User Production Service
01
Workflow flow

ComfyUI flow from API client to GPU workflow execution

The client submits workflow JSON to the queue, ComfyUI executes the graph on GPU and returns progress/output over HTTP/WebSocket.

01Client
02/prompt API
03Queue
04Workflow Executor
05GPU / Output
02
GPU load

Do not size ComfyUI VRAM from checkpoint size alone

A workflow may load text encoders, VAE, ControlNet, LoRA, video models or multiple checkpoints. Resolution and batch size also change peak VRAM.

CheckpointMain modelVRAMBase
ControlNet/LoRAAdditional modelsVRAM/RAMWorkflow-dependent
ResolutionLatent sizeVRAMGrows quickly
Batch/video framesParallel dataVRAM + timeHigh impact
03
Production boundary

Add an access layer before exposing ComfyUI to the Internet

Custom nodes execute Python code, so installing untrusted packages on a production host is risky. Use reverse proxy authentication, upload/output limits and a dedicated service user.

Private bind
Authentication proxy
Custom-node allowlist
Track model checksums/versions
Output retention
GPU queue limit
04
API and GPU checks

Verify ComfyUI server, queue and GPU state

Verify endpoint paths against the current ComfyUI server routes.

Command 1
nvidia-smi
Command 2
curl -s http://127.0.0.1:8188/system_stats | head
Command 3
curl -s http://127.0.0.1:8188/queue | head
Command 4
ss -lntp | grep ':8188'
Command 5
ps aux | grep '[m]ain.py'
05
Model and output storage

Plan sufficient fast storage alongside GPU capacity

Checkpoints, VAEs, LoRAs, ControlNets and outputs can consume hundreds of GB. Without cache/output lifecycle policies, NVMe can fill quickly.

Model cache
Checkpoint versions
Output quotas
Temporary files
NVMe free-space alerts
Back up workflows/config
Official documentation

Official sources

ComfyUIServer Overviewdocs.comfy.orgComfyUIAPI Examplesdocs.comfy.orgComfyUIRoutesdocs.comfy.orgComfyUISystem Requirementsdocs.comfy.orgComfyUIStartup Flagsdocs.comfy.org
FAQ

Frequently asked questions

Does ComfyUI have an API?

Yes. Official server docs cover prompt submission, queue/history and WebSocket progress.

How much VRAM does ComfyUI need?

It depends on model, resolution, batch, ControlNet/LoRA and video nodes.

Are custom nodes safe?

It depends on source. They execute Python code, so production should allow only trusted, pinned nodes.

EKA YAZILIM VE BİLİŞİM SİSTEMLERİ

Size ComfyUI GPU from peak VRAM and queue time

Share workflow JSON, models, resolution, batch and daily generations; we can size GPU/VRAM/NVMe.

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