If you’re lucky enough to have one of AMD’s high-end Ryzen Threadripper CPUs 2990WX (or the soon-to-come 2790WX) , AMD has just given you a cherry for the top of your sundae. A new piece of software called Dynamic Local Mode will boost performance on some tasks by rerouting loads in Windows. Robert Hallock of AMD introduced Dynamic Local Mode in a blog post on Friday.

Dynamic Local Mode was created to address a specific performance characteristic of Ryzen Threadripper. Instead of a single chip, AMD’s massive 32-core and 24-core Threadripper CPUs are built by connecting four dies using a high-speed fabric interface. Two of the dies have their own memory controllers, and two are pure compute chips which must access memory through the adjacent die.

2990wx die topology updated IDG

On AMD’s 32-core and 24-core Threadrippers the pure compute dies must access RAM through an adjacent chip that has its own memory controller.

While many workloads don’t care, those that are memory latency-intensive can take a hit. In some apps, the design can lead to performance degradation, which can now be fixed with Dynamic Local Mode.

Hallock explains how the software works in his blog post. “Dynamic Local Mode is implemented as a Windows 10 background service that measures how much CPU time each thread on the system is consuming. These threads are then ranked from most to least demanding, and the top threads are automatically pushed to the CPU cores that contain direct memory access.” Dynamic Local Mode does its best to juggle workloads without dropping anything important, Hallock continued. “Once these cores are consumed by work, additional threads are scheduled and executed on the next available CPU core. This process is continuous while the service is running, ensuring the most demanding threads always get preferential time on cores with local memory. (As a corollary, insignificant threads are pushed to other dies.)”

The company said its own tests have shown performance gains of 10 percent to 47 percent depending on the task. Most of the workloads AMD showed were games, but Rodinia HPC Benchmark was boosted by 21 percent using the Dynamic Local Mode.

While promising, AMD officials did warn users that not all apps will see a boost.

performance dynamic mode amd AMD

AMD said its new Dyanmic Local Mode will up performance significantly.

AMD said the mode will be integrated into a version of its Ryzen Master utility that’s scheduled to be released October 29. Dynamic Local Mode doesn’t require rebooting to turn on and doesn’t appear to disable cores to run.

Although AMD did not openly blame Microsoft, it would appear that Dynamic Local Mode helps solve deficiencies with the Windows 10 operating system.



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