Upgrading python livekit-agents to 1.5.6 causing memory issues

[nilkanth]

Hello,

We have recently upgraded python livekit-agents from 1.5.1 to 1.5.6, and it caused massive spikes in memory. Here is the AWS graph before and after deployment.

NOTE: The sudden drop in memory usage is due to auto horizontal scaling of the instance.

The pattern suggests that something is using memory and not releasing it. In the update, we just upgraded livekit-agent from 1.5.1 to 1.5.6 and added default Preamptive generation configs; nothing else.

[CWilson]

I’ve not hear anyone report this but I will check with our team to see if they’ve seen this.

[nilkanth]

After downgrading its working perfectly fine

[CWilson]

Thanks for this. I will pass that along to the team.

[CWilson]

Our team ran a test of 1.5.6 (from 1.5.3) and did not see any unusual memory usage. It was same memory usage in both cases.

Can you provide your agent configuration or other ways of reproducing this?

[nilkanth]

Sure. Here are the configurations

#>>>>>>>>>>>>>>>>>>>>>>>>> BEFORE
[project]
name = "voicebot-livekit"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = [
    "aiohttp~=3.13",
    "livekit~=1.1.2",
    "livekit-agents[azure,cartesia,deepgram,elevenlabs,google,groq,inworld,openai,sarvam,silero,turn-detector]==1.5.1",
    "livekit-api~=1.1.0",
    "livekit-plugins-noise-cancellation~=0.2",
    "livekit-protocol~=1.1.2",
    "motor~=3.7",
    "pymongo>=4.12",
    "python-dotenv~=1.1",
]

#>>>>>>>>>>>>>>>>>>>>>>>>> AFTER
#>>>>>>>>>>>>>>>>>>>>>>>>> NOTE: Happens for the 1.5.2 as well. 
[project]
name = "voicebot-livekit"
version = "0.1.0"
description = "Add your description here"
readme = "README.md"
requires-python = ">=3.11"
dependencies = [
    "aiohttp~=3.13",
    "livekit~=1.1.2",
    "livekit-agents[azure,cartesia,deepgram,elevenlabs,google,groq,inworld,openai,sarvam,silero,turn-detector]==1.5.6", # Same result for 1.5.2 as seen in graph
    "livekit-api~=1.1.0",
    "livekit-plugins-noise-cancellation~=0.2",
    "livekit-protocol~=1.1.2",
    "motor~=3.7",
    "pymongo>=4.12",
    "python-dotenv~=1.1",
]

# EXAMPLE CONFIG
session = AgentSession(
    vad=VAD,  # << Prewarm silero.VAD.load()
    stt=deepgram.STT(model="nova-3-general"),
    llm=openai.LLM(model="gpt-4.1-mini"),
    tts=elevenlabs.TTS(model="eleven_flash_v2_5"),
    user_away_timeout=8.0,
    preemptive_generation=True,
    turn_handling=TurnHandlingOptions(
        turn_detection="vad",
        endpointing={
            "min_delay": 0.2,   # 200ms
        },
        interruption={
            "mode": "vad",
            "enabled": True,
            "discard_audio_if_uninterruptible": True,
            "min_duration": 0.4,   # 400ms
            "min_words": 1,
            "false_interruption_timeout": 2.0,
        },
    )
)

[CWilson]

@nilkanth

Happens for the 1.5.2 as well.

Thanks for that. So looks like you are seeing the memory issue started in 1.5.2 instead of 1.5.6?

I will pass this along.