I'm using a pre-built Wowza Streaming Engine AMI (c3.large instance - 3.75GB RAM) on Amazon EC2. Only 8 channels or streams are configured on this server but the RAM utilization is already at 95%. It has no transcoding; distribution is thru Amazon Cloudfront; live broadcast and VOD playback are very rare as the videos on each channel/stream are played thru stream scheduler; each channel/stream has its own streamschedule.smil that resides on Amazon S3; videos also reside on Amazon S3. Since I'm worrying due to very high RAM utilization, I launched another instance (c3.2xlarge - 15GB RAM) and duplicated the configuration to this new server. However, the RAM utilization of this new server is also very high; it reaches 70%. What could be the possible cause/s of this very high RAM utilization?