OS That Support Configurable Data Links Between CPU
Posted: Thu Aug 16, 2007 10:50 am
Themis Slice is a blade motherboard with 3 CPU sockets. According to Themis 3 sockets is faster than 4 sockets, because there is a direct connection between all sockets.
IMO if the CPU vendor create chipset / multicores CPU with configurable / programmable data links between sockets / core, this will solve the latency problem, similar to the "dead" transputer CPUs.
The operating system / applications can change the data links configuration between sockets / cores during runtime.
Is there any present chipset / multicores CPU with configurable /programmable data links?
From Inquirer:
"Why would you want three sockets rather than four? Easy, latency. Any CPU in a 3S system is one hop away from any other CPU. In a 4S system, you can be two hops away. This adds latency, and more importantly, you take a big hit on cache coherency latency. This kills performance. Because of this, a 3S machine may end up faster than a 4S under some workloads. Given an equal CPU count, a cluster of 3S machines will be faster than 4S machines. You only pay for it in density and the odd looks your co-admins give you when you tell then you have 3S machines."
IMO if the CPU vendor create chipset / multicores CPU with configurable / programmable data links between sockets / core, this will solve the latency problem, similar to the "dead" transputer CPUs.
The operating system / applications can change the data links configuration between sockets / cores during runtime.
Is there any present chipset / multicores CPU with configurable /programmable data links?
From Inquirer:
"Why would you want three sockets rather than four? Easy, latency. Any CPU in a 3S system is one hop away from any other CPU. In a 4S system, you can be two hops away. This adds latency, and more importantly, you take a big hit on cache coherency latency. This kills performance. Because of this, a 3S machine may end up faster than a 4S under some workloads. Given an equal CPU count, a cluster of 3S machines will be faster than 4S machines. You only pay for it in density and the odd looks your co-admins give you when you tell then you have 3S machines."
