Remote Execution Caching Compiler (RECC) CppCon 2024 September 19, 2024 Shivam Bairoliya Software Engineer© 2024 Bloomberg Finance L.P. All rights reserved. What is RECC? ● Remote Execution Caching source build tool that wraps compiler commands and optionally forwards them to a remote build execution service ○ Encompasses the capabilities of both ccache and distcc ○ Supports remote linking and CC) ○ Supports multiple operating systems (Linux, macOS, Solaris) ● Compatible with any remote execution API server supported by Bazel ○ Single Host Server/Proxy: BuildBox-CASD ○ Distributed Server:

all? ● Typical embedded systems are small and follow static execution patterns ● Even a multi-core automotive chip may have parallel execution but no concurrency if components scheduled on different cores a predetermined time slice in the schedule for execution ● The complete schedule is configured upfront as part of the system design ● Temporal execution of tasks is completely deterministic ⇒ Tasks not OS at the bottom. ⇒ Lots of concurrency, asynchronous APIs as the default Asynchronous APIs in Adaptive Autosar ara::com::FindServiceHandle find_service_handle = RadarServiceProxy::StartFindService(

custom handling • Exceptional events may require special processing • Custom or adaptive behavior may invoke novel execution paths Guarantee • Inviolate principle or behavior Always true Rule • Highly custom handling • Exceptional events may require special processing • Custom or adaptive behavior may invoke novel execution paths • Examples: • Prefer generalized solution, but plugin API allows for custom custom handling • Exceptional events may require special processing • Custom or adaptive behavior may invoke novel execution paths • Examples: • Prefer generalized solution, but plugin API allows for custom

Outline of an implementation Conclusion Toward an improved version Integration function (4/4) // Execution of backward and forward integration std :: thread backward(loop , std ::ref(past), −one , t_backward Context Theoretical foundations Outline of an implementation Conclusion Adaptive Runge-Kutta methods Butcher tableau for explicit adaptive Runge-Kutta methods c A bT ˜bT = c1 a1,1 0 0 · · · 0 0 c2 a2,1 a2 Outline of an implementation Conclusion Implicit Runge-Kutta methods Butcher tableau for implicit adaptive Runge-Kutta methods c A bT ˜bT = c1 a1,1 a1,2 a1,3 · · · a1,s−1 a1,s c2 a2,1 a2,2 a2,3 · · · a2

AMD GPUs New, not experimental anymore, and works on Ponte Vecchio My name has changed to adaptive cpp.Multiple Backends in Development SYCL on even more low-level frameworks. For more information: PIM SDK Samsung PIM-HBM2 PIM emulator DPC++ fork SYCLops NewSYCL ON COMPILER EXPLORER (CPU EXECUTION) https://godbolt.org/z/zexn nr4ne “Compiler explorer is more fun than work”, Chris Gearing, evaluated ▪ Ignore - unchecked ▪ Enforce - terminate if violation detected ▪ Observe - continue execution (still UB if violation detected) 53SYCLSYCL::MALLOC(0) ▪ C malloc(0) - either returns a null pointer

take(particles.size()) | to(); /* Resample algorithm in AMCL (Adaptive Monte-Carlo Localization) */ particles = particles | sample(gen) | take_until_kld() take(particles.size()) | to(); /* Resample algorithm in AMCL (Adaptive Monte-Carlo Localization) */ particles = particles | sample(gen) | take_until_kld()

are a basic mathematical concept that appear in all kinds of algorithms, from recursive sorting to adaptive mesh refinement. Interval notation allows a more natural expression of the idea of an algorithm

somewhat reflects how we write software (1/3) 11 ● Typically we have one main, sequential thread of execution ● One CPU core executes code sequentially ○ i.e. One instruction after the other. Instruction somewhat reflects how we write software (2/3) 12 ● Typically we have one main, sequential thread of execution ● One CPU core executes code sequentially ○ i.e. One instruction after the other. ○ We can abstract Foo() Bar() Baz() Execute main execution pathThis somewhat reflects how we write software (3/3) 13 ● Typically we have one main, sequential thread of execution ● One CPU core executes code serially

too. Although not universally loved/used, exceptions are a powerful mechanism of maneuvering execution on the unhappy path. Even if std::exception and related machinery are not your cup of tea Exceptional C++ Although not universally loved, exceptions are a powerful mechanism of maneuvering execution on the unhappy path2021 Victor Ciura | @ciura_victor - Exceptional C++ 8 Motivation Exceptions attempt to handle the exception, // stop searching for another handler func // and continue execution return ExceptionContinueExecution; } { magic fix }2021 Victor Ciura | @ciura_victor - Exceptional

can come from the command line, profiles or from the values cached in the latest conan install execution. 2. Conan retrieves the MyLib/1.0@user/channel recipe, reads the settings attribute, and assigns the --packages/-p or --query/-q flags. --packages allows you to explicitly declare which package gets uploaded to the server by specifying the package ID. --query accepts a query parameter, e.g. arch=armv8 arch=armv8 and os=Linux, and only uploads binary packages which match this query. When using the --query flag, ensure that your query string is enclosed in quotes to make the parameter explicit to your shell