This article seeks to explore some of the key tradeoffs made when designing a product, with reference to the software and electronic design. Managing tradeoffs in selfadaptive software architectures. These software managed tlbs can simplify hardware design and provide greater flexibility in page table structnre, but typically have slower refill times than hardwam managed tlbs 31. Quality assurance tradeoff analysis method qse tu wien.
Some may say that approach of software managed tlbs is slower, but it isnt an issue. Software engineering has been more focused on original development but it is now recognised that to achieve better software, more quickly and at lower cost, we need to adopt a design process that is based on. Purchase managing tradeoffs in adaptable software architectures 1st. Through hardware monitoring and simulation, we explore tlb performance for benchmarks running on a mips r2000based workstation running ultrix, osf1, and three versions of mach 3. In software development there are some basic tradeoffs when you consider a specific design feature. See, a software project is unlike projects in other engineering disciplines. Dunstan power is director of bytesnap design, which supplies integrated software development and embedded design services. Developers in turn make decisions regarding design and implementation details. So in the end, it comes back around to the idea of managing tradeoffs. This paper explores these issues by examining design tradeoffs for softwaremanaged tlbs and their impact, in conjunction with various operating systems, on overall system performance. Tm design tradeoffs and their interaction with a range of operating systems including monolithic and micnkwnel designs.
Unlike hardwaremanaged tlb misses, which have a relatively small refill penalty, thedesign tradeoffs for softwaremanaged tlbs are rather complex. Through hardware monitoring and simulations, we explore tlb performance for benchmarks running on a mips r2000based workstation running ultrix, osf1, and three versions of mach 3. The design tradeoffs for softwaremanaged tlbs can be complex, when, as in the systems exam ined here, there is significant variance in the refill penalty. How to make smart tradeoffs when developing software products. Functional principles of cache memory tlb and virtual. The selection and design of quality assurance qa methods for software development. Design tradeoffs for softwaremanaged tlbs acm sigarch. Every time a tlb miss is detected, a special exception is generated by processor. Design l%adeoffs for softwaremanaged tlbs school of computer.
This work explores softwaremanaged tlb design tradeoffs and their interaction with a range of monolithic and microkernel operating systems. Through hardware monitoring and simulation, we explore tlb performance for benchmarks running on a mips r2000based workstation running ultrix, osf\l, and three versions of mach 3. In perfect world you can get all of the best things in one place. Managing tradeoffs in adaptable software architectures. Citeseerx design tradeoffs for softwaremanaged tlbs. This work explores softwaremanaged tlb design tradeoffs and their interaction with a range of operating systems including monolithic and microkernel designs. Thats my 20 years of software development experience voice talking. An example is when software architects try to balance the quality attributes of the. Product management is about managing tradeoffs and compromises. At the same time, operating systems such as mach 3.
1200 384 464 404 477 424 1258 697 977 651 417 163 315 1430 1338 468 1213 848 99 1639 1516 1404 1510 253 373 428 1111 327 844 730 312 798 1064 66