SwiftHighCPU

Problem
In our testing Swift environment, we find that CPU utilization rate of Storage node often goes up to 100% even without any request.

Testing environment

 * Nodes: 5 x Dell R510
 * CPU: Intel® Xeon® E5360
 * Memory: 12GB
 * Replica: 3
 * No. of Objects:      150,000,000
 * No. of Accounts:   120,000
 * No. of Containers: 160,000

Audit
Each command run for only one time, and count their time usage:


 * swift-account-auditor :       1.5m
 * swift-account-replicator:    9.5m
 * swift-container-auditor:      8.4m
 * swift-container-replicator:  9.3m
 * swift-container-updater:     19.0m
 * swift-object-updater:          0.1 s
 * swift-object-replicator:       10.5 hours
 * swift-object-auditor:           48.3 hours