neethubal/bzsim

How neethubal/bzsim works

BZSim combines ZSim’s execution-driven system simulation with BookSim’s detailed interconnect model. The main workflow is to launch a configured simulation, initialize cores and system resources, schedule simulated execution and memory activity, and collect statistics; BookSim models traffic through configurable networks and routers. The README documents optional DRAMSim2 integration. Several subsystem links reflect documented capability or header-level integration; unsampled implementation details are not assumed.

Main entry points: init.cpp System initialization · zsim.cpp ZSim runtime · trafficmanager.cpp Traffic manager · iq_router.cpp Router models

Components 26

ZSim Runtime

ZSim runtime zsim/src/zsim.cpp
System initialization zsim/src/init.cpp
Simulation configuration zsim/src/config.cpp
Thread scheduler zsim/src/scheduler.h
Process tracking zsim/src/process_tree.h
Simulation allocator zsim/src/galloc.h

System Modeling

Core models zsim/src/core.h
Instruction decoder zsim/src/decoder.cpp
Memory hierarchy zsim/src/memory_hierarchy.cpp
Cache modeling zsim/src/cache.cpp
Detailed memory zsim/src/detailed_mem.cpp
DRAMSim2

BookSim Interconnect

Interconnect interface zsim/src/booksim_net_ctrl.cpp
BookSim configuration booksim2/src/booksim_config.cpp
Traffic patterns booksim2/src/traffic.cpp
Traffic manager booksim2/src/trafficmanager.cpp
Network topologies booksim2/src/networks/network.hpp
Router models booksim2/src/routers/iq_router.cpp
Routing functions booksim2/src/routefunc.hpp
Flits and credits booksim2/src/flit.hpp
Switch allocation booksim2/src/allocators/allocator.cpp
Power monitoring booksim2/src/power/power_module.cpp

Statistics and Tracing

Statistics zsim/src/stats.h
Logging zsim/src/log.h
Network statistics booksim2/src/stats.cpp

Other components

Simulation user

Connections 25

Simulation user → ZSim runtime: launches
ZSim runtime → System initialization: initializes zsim/src/zsim.cpp
System initialization → Simulation configuration: reads zsim/src/init.cpp
ZSim runtime → Thread scheduler: uses zsim/src/zsim.cpp
ZSim runtime → Process tracking: tracks processes zsim/src/zsim.cpp
System initialization → Core models: configures zsim/src/init.cpp
Core models → Instruction decoder: decodes instructions zsim/src/core.h
System initialization → Memory hierarchy: initializes zsim/src/init.cpp
System initialization → Cache modeling: configures zsim/src/init.cpp
System initialization → Detailed memory: configures zsim/src/init.cpp
Detailed memory → DRAMSim2: may integrate
ZSim runtime → Interconnect interface: includes interconnect control
Interconnect interface → Traffic manager: drives network traffic
Traffic manager → Network topologies: transfers flits
Traffic manager → Traffic patterns: selects patterns
Network topologies → Router models: contains routers booksim2/src/networks/network.hpp
Router models → Routing functions: computes routes booksim2/src/routers/iq_router.cpp
Router models → Flits and credits: receives flits booksim2/src/routers/iq_router.cpp
Router models → Switch allocation: uses allocation booksim2/src/routers/iq_router.cpp
Traffic manager → Network statistics: records results
Traffic manager → Statistics: aggregates metrics
System initialization → Simulation allocator: initializes zsim/src/init.cpp
ZSim runtime → Logging: uses zsim/src/zsim.cpp
Network topologies → BookSim configuration: uses configuration
Router models → Power monitoring: may monitor

Drawn by GitDiagram on November 14, 2026 from the repository's file tree, README and source files. Read as Markdown ·