EZ-FRISK version 8.11 is now available!
This version includes the USGS NGA East Ground Motion Model that was used for NSHM 2018.
This model and optimized to run more quickly than Goulet et al.(2018) added in v8.10.
We will be optimizing Goulet et al. (2018) in the next release.
We have also fixed several bugs and slightly modified the ribbon menu in this release.
Added in version 8.10:
This version brings these new features:
- NGA East Ground Motion Model - Goulet et al. (2018)
- NGA Subduction Ground Motion Models:
- Abrahamson & Gulerce (2020)
- Kuehn et al. (2020)
- Parker et al. (2020)
- Updated and improved Graphical User Interface
- Updated Chart creation and editing tools
- Under the hood performance optimizations
Feedback Control For Computer Systems May 2026
): The lever the controller pulls (e.g., scaling server instances or adjusting cache size). The computer process being managed. Measured Output ( ): The actual current performance metric. 🛠️ The PID Controller: The Standard Algorithm
): The algorithm that calculates what change to apply based on the error. Control Input ( Feedback Control for Computer Systems
Feedback control for computer systems applies classical control theory—originally used for physical systems like engines—to digital environments like web servers, databases, and caches. It enables systems to self-adjust to maintain performance goals despite unpredictable workloads or resource shifts. ⚙️ Core Concepts of Feedback Control ): The lever the controller pulls (e
The controller is the most common algorithm used to close the feedback loop. Feedback Control for Computer Systems [Book] - O'Reilly 🛠️ The PID Controller: The Standard Algorithm ):
The primary objective of a feedback loop is to minimize the —the difference between a desired state ( Setpoint ) and the actual state ( Measured Output ). Setpoint (
): The target value (e.g., a 95% cache hit rate or 200ms latency). Controller (
