Faster than Real-Time - laysim-gr740-mdbt

laysim-gr740-mdbt (Multi-thread DBT)


I'm really proud to release laysim-GR740 v1.2 with laysim-gr740-mdbt. 

laysim-gr740-mdbt is a new parallel GR740 processor emulator which adopts the multi-thread framework with DBT through 2 years development by KARI. It can satisfy the real-time performance of GR740 on a high-end PC such as Intel i9-11900K @5GHz.


Below Figure is a graph comparing the real-time performance and cycle accuracy of the most representative tests among all tests. laysim-gr740-dbt outperforms the real-time performance of GR740 on Dhrystone with 334.69%, and it can meet the real-time performance on Whetstone with 120.19%. But laysim-gr740-dbt cannot meet the real-time performance for some RTEMS 5.1 SMP examples which utilize almost 100% CPU load with 4 cores and its execution time is more than 5 seconds under the SMP environment. 

Only laysim-gr740-mdbt can meet the real-time performance of GR740 under RTEMS SMP environment. 

laysim-GR740 v2.0 with laysim-gr740-mdbt can be downloaded from Download Article (https://layright.blogspot.com/2020/02/download-laysim-leon3.html).




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I'm Jong-Wook Choi from KARI (Korea Aerospace Research Institute). I'm an on-board flight software engineer in KARI. I've developed the flight software for KOMPSAT-2/3/5/3A, CAS-500 and GEO-KOMPSAT-2A/2B. Currently I involve in developing of the flight software for KOMPSAT-6/7/7A, and KPLO (Korean Pathfinder Lunar Orbiter). For many years, flight software (FSW) has been developed and verified using the software test bed (STB) environment based on the real hardware in KARI. During the development of FSW on the STB, we have experienced lots of annoying problems such as delayed deliver of target hardware, limited concurrent access to the STB from software engineers, and the time and cost to create multiple STBs for different satellites. Thus, software-based satellite simulators have been developed from the beginning of a satellite project to avoid these issues. The software-based simulator enables the FSW to be developed concurrently with the satellite hardware from the in
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laysim-GR740 Quad Core Processor Emulator laysim-GR740 consists of three types of emulators: laysim-gr740 ,  laysim-gr740-dbt  and  laysim-gr740-mdbt . laysim-gr740 is a graphic user interface (GUI)-based and cycle-accurate emulator for the GR740 quad core processor based on interpretation method. It includes an embedded source-level debugger and supports MMU for Linux-SMP and XtratuM-SMP. laysim-gr740-dbt is a GUI-based high-performance and cycle-approximate processor emulator with dynamic binary translation method. laysim-gr740-mdbt  is a new parallel GR740 processor emulator which adopts the multi-thread framework with DBT through 2 years development by KARI. It can satisfy the real-time performance of GR740 on a high-end PC such as Intel i9-11900K @5GHz. All  laysim-gr740 ,  laysim-gr740-dbt  and  laysim-gr740-mdbt  support Windows and Linux x64 platform including CentOS 7/8, Ubuntu 18.04 and Debian 10.3. Also two types of CLI (Command Line Interface) version, laysim-gr740
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