## Performance ## Lets dive into Performance issues • Everything in JavaScript defaults to being on the same thread. Too much work on main thread • Android nested layouts • Functions and objects defined • Gathering and saving data from/to your database is a prime example. ## Enabling Optimization Testing • npm i v8-natives --save • Edit your app/package.json • Add --allow-native-syntax to v8Flags debugger; } } • Polymorphic functions function addTest() { add(10, 20); add("testing", "this"); } function add(x, y) { return x + y; } ## Beware of Object changes! var

## PERFORMANCE MATTERS Emery Berger College of Information and Computer Sciences UMASS AMHERST (joint work with Charlie Curtsinger, Grinnell College) emeryberger.com, @emeryberger ## A short time ### un.bmp ## Performance used to be easy  Performance improvement in the '80s ## I I ## Performance improvement in [Image](/uploads/documents/6/9/a/5/69a5a7f2064c85b44eb3710c323581ae/p19_1.jpg) loading... ## Performance not easy anymore 

## +23 ## Back To Basics Testing ## PHIL NASH ## 20 23 October 01 - 06 ## What is a test? ## What is a test? ## operation ## What is a test? ## operation input values ## What is a test? ## operation /tr>DependencyAssertionPerformanceBetaConfigurationFault injectiontesting pyramid System Tests Integration Tests Unit Tests ## What is a Unit Test? ## What is a Unit Test

## Scientific Unit Testing Dave Steffen, Ph.D. Software Lead dsteffen@scitec.com — in Physics which is relevant SCiTEC Science & Technology Innovation www.scitec.com If I have seen further bad tests are almost always better than no tests! ## Unit Testing OO Code ## Test using only the public interface ("Black Box" testing) • Forces better design ("design for testability") coupling to implementation • Unit tests are also examples and documentation ## Object Oriented testing ## Let's unit test this class 1 // Cup.h // creates an empty cup bool IsEmpty(); bool Fill();

## +21 ## Testing Compile-time Constructs Within a Runtime Unit Testing Framework ## I GOR BOGOSLAVSKYI 20 21 October 24-29 ## We use C++ (14) for safety-critical applications that we deliver to our ments/4/8/e/9/48e97f15addfced313a9cb60758e45d2/p2_1.jpg) Errors have a high cost, so rigorous testing is a must We use increasingly more compile-time polymorphism and checks Question: how to test if get_half_of(T smth) { return smth / T{2}; } ## Write a rigorous testing suite #include TEST(TestMyApi, Halving) { EXPECT_FLOAT_EQ(21.0F, get_half_of(42

## +24 ## Back To Basics Debugging and Testing ## GREG LAW & MIKE SHAH ### Writing software is really hard. If it’s not tested, it doesn’t work Or at least it will soon stop working. ## WHAT'S 4/p5_1.jpg) BUT WHEN I DO, DO IT IN PRODUCTION Software development done right is basically testing and debugging. ## GOOD TESTS ARE • Independent • Repeatable Fast ## DIFFERENT TESTS — ALL ARE generally shallow / easy-to-fix. Tests run fast – tight feedback loop. But... Assumptions! ## UNIT TESTING FRAMEWORKS Google Gest Catch2 Boost.Test • CppUTest • doctest ![Image](/uploads/documents/

## +24 ## Back To Basics Unit Testing ## DAVE STEFFEN ## 20 24 September 15 - 20 ## Unit Testing is a Big Topic How many youtube videos about C++ unit testing ## ✗ 🔍 🔍 ✗  Testing Compile-time Constructs in a Runtime Unit Testing ... YouTube · CppCon Feb 15, 2022 It's A Bug Hu Armor Plate You 2023 ## Unit Testing is a Big Topic • Jody Hagins (today): The Most Important Design Guideline is Testability • Greg Law and Mike Shah (tomorrow): Back To Basics, Debugging and Testing • Chip Hogg (Wednesday)

## Performance of Apache Ozone on NVMe Wei-Chiu Chuang (jojochuang) Ritesh Shukla (kerneltime) ## Agenda • Overview of how Ozone and how it scales • Why NVME is important for Ozone for scaling • Benefits Benefits of using NVME • Impala performance results from NVME clusters • Write path improvements results from NVME clusters • Summary • Questions ## Ozone Architecture ![Image](/uploads/documents benefits with all NVME clusters ## Why NVME - Enables destaging of data with minimal impact to performance. • Long tail latency is a small percentage of the overall latency • Vendors increasing shipping

## 20 23 October 01 - 06 ## +23 ## Noexcept? Enabling Testing of Contract Checks ## PABLO HALPERN & TIMUR DOUMLER ## Welcome What can the Screen Actors Guild and the Writers Guild of America tell run time How to unit test contract-checking annotations (CCAs) How noexcept interacts with unit testing of CCAs. We will go over everything twice! ## About the presenters In Absentia ## Pablo Halpern Unit Testing, CCAs and Exception Specifications CCAs can themselves use the source of bugs and should verify as part of unit testing. • Overuse of noexcept can interfere with such unit testing We've

## +23 ## Continuous Regression Testing for Safer and Faster Refactoring PEJMAN GHORBANZADE ## Continuous Regression Testing for Safer and Faster Refactoring  Testing as risk mitigation