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On.System Architecture
System Architecture (and it’s subfield Software Architecture) is a discipline which is surprisingly poorly covered. In a sense, it is still more an art than a science, and usually requires somebody intimately familiar with practical systems, to tell what’s to do and what’s to avoid when building a system.
IT Hares have lots of experience in both Software Architecture and more general System Architecture, and are trying to share their knowledge (and more importantly, their feelings) about them.
Size Matters - Is 64-bit App Always Better?
May 1, 2014 by • “No Bugs” Bunny
Abstract:
Sometimes it makes perfect sense to use 32-bit application on 64-bit platform.
Quote:
It is obvious that for N between 13,000,000 and 21,000,000, 64-bit application works about 1000x slower.
Filed under: On.System ArchitectureRequirement analysisDesign decisionsOn.ProgrammingOptimizations
Read moreHard Upper Limit on Memory Latency
September 1, 2013 by • “No Bugs” Bunny
Abstract:
Speed of light imposes hard limits on possible latencies of high-volume RAM
Quote:
Even if each bit is implemented by single atom of silicon, 2^90-byte RAM is the largest RAM which can possibly have latencies comparable to modern DDR3 SDRAM.
Filed under: On.System ArchitectureRequirement analysisOn.ProgrammingOptimizations
Read more(640K) 2^256 Bytes of Memory is More than Anyone Would Ever (Need) Get
January 1, 2013 by • “No Bugs” Bunny
Abstract:
Physics imposes hard limits on amount of memory we will get in foreseeable future.
Quote:
Even if every memory cell can be represented by a single atom, we would need 1 to 10% of all the stars and planets which we can see , to implement 2^256 bytes of memory.
Filed under: On.System ArchitectureRequirement analysis
Read moreKeep It Simple, Singleton!
November 1, 2012 by • “No Bugs” Bunny
Abstract:
Naïve mappings from business domain to programmer domain tend to survive requirement changes better
Quote:
How do we distinguish good assumptions from bad ones?
Filed under: On.System ArchitectureDesign decisionsOn.DevelopmentDevelopment Philosophy
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