[email protected] (Mike Myers) writes: > A few years ago, we pretty much dropped the concept of MIPS, changing > it from Millions of Instructions Per Second to Meaningless Indicator > of Processor Speed. Simply compare the accomplishment of a single line > of assembler, such as comparing LR to CFC (Compare and Form Codeword) > or UPT (UPdate Tree). It becomes obvious that a lot more LRs (or > similar RR instructions) can be accomplished per second than the > number of CFCs or UPTs in the same interval of time on the same > machine.
for a long time, industry standard for MIPS is number of benchmark interations compared to baseline runs on 370/158-3 & vax-11/780 (not actually count of instructions) http://en.wikipedia.org/wiki/Instructions_per_second IBM numbers: z900, 16 processors, 2.5BIPS (156MIPS/proc), Dec2000 z990, 32 processors, 9BIPS, (281MIPS/proc), 2003 z9, 54 processors, 18BIPS (333MIPS/proc), July2005 z10, 64 processors, 30BIPS (469MIPS/proc), Feb2008 z196, 80 processors, 50BIPS (625MIPS/proc), Jul2010 EC12, 101 processors, 75BIPS (743MIPS/proc), Aug2012 z13 published refs is 30% move throughput than EC12 or about 100BIPS with 40% more processors ... or about 710MIPS/proc (which would be per processor decline from EC12). IBM previous references were that at least half of the per processor throughput increase from z10 to z196 was introduction of out-of-order execution and other features that have been part of other platforms for decades. This is critical because of the increasing mismatch between processor machine cycle and memory access latency ... aka memory access latency when measured in count of processor cycles is compareable to 1960s disk access latency when measured in count of 1960s processor cycles (effective throughput is increasingly dependent on how memory access latency is handled). -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
