CSR: Small: Simulation of Multicore Processors with One (or More) Fast Core(s) Using Wind River SIMICS

科学计算最重要的任务是从当前的多核微处理器时代开始规划未来的道路，这个时代的微处理器是在深度亚微米的CMOS中实现的。这必须以一种保证性能改进的方式来完成。否则，不断攀升的纳米级制造成本将是不可持续的。异构型多核微处理器面临着几个主要问题，其中最重要的问题是Amdahl-S定律，该定律表明，即使是相对少量的串行或低并行度代码也会限制可能的增益。显然，避免这一困境的最终方法是使用采用Beyond-Cmos的高时钟速率单元(HCRU)内核来极大地加速串口代码。设备进场。过去的研究表明，对于许多使用BiCMOS的关键组件来说，时钟频率达到20-30 GHz是可能的，但需要3D技术来缓解存储墙问题。这项研究探索了一种全新的90 nm IBM SiGe HBT(300 GHz FT)BiCMOS工艺来实现这一目标，同时以超高的速度换取4倍的低功耗。战略将是在这个新的过程中重新设计计算机的某些关键部件，以验证在更低的功率下也能获得同样的高速。该项目的第二个重点是通过高级模拟来验证，以高时钟速率执行串行码实际上将导致预期的性能改善。这将使用Wind River SIMICS模拟包进行。

The most important task for scientific computing is to plan the way forward from the current era of multicore microprocessors implemented in deeply submicron CMOS. This has to be done in such a way that performance improvements are guaranteed. Otherwise the escalating costs of fabrication at the nanometer scale will not be sustainable. Heterogeneous multiple core microprocessors face several major problems, not the least of which is codified in Amdahl?s Law, which shows that even relatively small amounts of serial or low-parallelism code can limit the gains that are possible. It is clear that the ultimate way to circumvent this dilemma is to greatly accelerate the serial code using a high clock rate unit (HCRU) core using a ?beyond-CMOS? device approach. Past research suggests that clock rates of 20-30 GHz are possible for many key components using BiCMOS, but 3D technology is needed to mitigate memory wall problems. This research explores a brand new 90nm IBM SiGe HBT (300GHz fT) BiCMOS process to accomplish this goal while trading excess speed for 4X lower power. The strategy will be to redesign certain critical components of a computer in this new process to verify that the same high speed is obtained at a lower power. The second thrust of the project is to verify by high-level simulation that the execution of serial code at a high clock rate will in fact result in the expected improvement in performance. This is to be conducted using the Wind River SIMICS simulation package.