Has anyone really noticed much of a difference with the newer and newer memory bandwidths and architectures? I was thinking about this for a moment and it occurred to me that if a given CPU has a 90+ % level 2 cache hit success, that means <10% of the time there is a cache miss and the system is forced to go out to the main memory for a piece of data/instruction. Normally the cache controller is busy fetching blocks of data/instruction independently of the CPU. If that's true, I don't see much gain even by doubling the main memory bandwidth.
Thoughts?? > -----Original Message----- > From: mike ingle [mailto:[EMAIL PROTECTED]] > Sent: Tuesday, July 02, 2002 10:26 AM > To: Protel EDA Forum > Subject: Re: [PEDA] Anyone know of a Altera listserver? and Single/Dual > CPU > > > Ok, > > So it seems that the consensus here is that twin CPU machines are > desireable. > I am in a quandry because the goal here truly is to maximize productivity. > > So, what influences my productivity? > > Right now I am in a max plus II design cycle where I am waiting > on compiles > for up to 10 min. watching 99% CPU usage assigned to max2win. > > It seems that the fastest possible solution to the single problem > of compile > time is: > > fasted possible CPU. > highest possible memory bandwidth. > > Since the problem is only going to run on a single processor (current > software rev anyway) is it not true that the compile time will be > minimized > in a single CPU configuration (MAX speed...) Of note the single > CPU 2.53ghz > boards w/ pc1066 rambus memory seem to be the fastest CPU/memory > bandwidth > configuration available. > > I have 3 other computers including my old 1ghz athalon available. > So, I can > check my e-mail... on the other machines while waiting. > > I currently don't use the auto-router (high speed mixed > analog/digital/ecl...), although there may be a reason to in the future > (like if the new autorouter from PROTEL is worth beans. > > I can live with the single processor limits on Max plus II. (OS slow as > molassis during compiles) > I can live with one processor using PROTEL (no autorouter), although an OS > available during sims would be nice;) > > Any seasoned guesses out there on performance increase > (compiles/autorouting/sim) from 1Ghz athalon 100Mhz fsb to: > > 1. Dual Athalon MP2000+ 1gb 266Mhz DDR. (around $2500) > > 2. 2.53 Ghz P4 533mhz fsb 1gb pc1066 rambus. ( around $2500 > > 3. dual xeon 2.4 400mhz fsb 1gb pc800 rambus. (over $5k) > > By the way in no way do I disagree with the 2 processor vs 1 processor for > overall usability, but the SOLE justification right now for the > new machine > is a productivity increase on compiles. We all know though that > there will > of course be later requirements. > > Oh, and one more time: does anyone know of an altera listserver? I can't > get newsgroups until I wring out some stuff w/ my ISP (pacbell dsl). > > Thanks again, > > Mike > > > > ************************************************************************ > * Tracking #: FD5D6646A251974798B62B497F11CE74E237106C > * > ************************************************************************ > > * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
