# CPU Utilization Different between BYOL and Hourly AMIs?

**URL:** https://community.wowza.com/t/cpu-utilization-different-between-byol-and-hourly-amis/49073
**Category:** Wowza Streaming Engine
**Created:** [June 27, 2017, 6:15pm UTC](https://community.wowza.com/t/cpu-utilization-different-between-byol-and-hourly-amis/49073 "2017-06-27T18:15:30Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![Kyle\_Isaac](https://avatars.discourse-cdn.com/v4/letter/k/4af34b/32.png) [@Kyle\_Isaac](https://community.wowza.com/u/Kyle_Isaac)
#### Post date: [June 27, 2017, 6:15pm UTC](https://community.wowza.com/t/cpu-utilization-different-between-byol-and-hourly-amis/49073/1 "2017-06-27T18:15:30Z")

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I have a Wowza server that ingests video streams and restreams them as adaptive bitrate HLS, transcoding accordingly. I am transcoding to 720p, 360p, 160p, and aac. On my m3.large instance running the BYOL AMI (Wowza 4.3.0.01, JDK 1.8.0\_40), I can restream one such video stream and still have enough system resources to restream an audio only stream.

If I try to restream more than one of these video streams, they both start stuttering and buffering. Since my video streams are only running a relatively small part of the time, rather than paying double to spin up another monthly server, I wanted to try using the hourly AMI (Wowza 4.6.0, JRE 1.8.0\_77) on an m4.large. But after starting up just one stream, transcoding as I was before, the CPU is saturated and the outgoing stream stutters and buffers badly.

I even tried moving the hourly instance to an m4.xlarge and while the CPU usage now hovers right around 100% with just one stream running, the output is not any noticeably better.

The only differences I can think of in these setups:

- Versions of Wowza
- Versions of Java
- License types

Has anyone else run into this and can shed some light?