SIGMOD Programming Contest 2018: Code Generation

This repository contains a prototype for the SIGMOD Programming Contest 2018. It is a showcase for code generation in databases and for COAT, an EDSL for C++ which makes code generation easier.

More details are explained in a blog post.

Build Instructions

Fetch the JIT engines LLVM and Asmjit, and build them (use more or less cores by changing -j, LLVM can take a while...):

$ ./buildDependencies.sh -j8

Then, build the prototype with cmake:

$ mkdir build
$ cd build
$ cmake ..
$ make -j8

Run Instructions

Download and unpack the test workload from the contest:

$ cd workloads
$ ./download.sh

Afterwards, run the test workload:

$ cd public
$ ../../build/sig18 -t public.{init,work}

This runs the naive baseline with a tuple-at-a-time execution engine without code generation.

For Asmjit, run:

$ ../../build/sig18 -a public.{init,work}

For LLVM, run:

$ ../../build/sig18 -l3 public.{init,work}

You can pick an optimization level from 0 to 3.

The expected results of each query are in public.res. Use diff to compare the output for correctness.

Here are some measurements from my workstation.

Back End	Compilation Latency	Execution Time
AsmJit	5 ms	550 ms
LLVM -O0	341 ms	768 ms
LLVM -O1	650 ms	513 ms
LLVM -O2	663 ms	521 ms
LLVM -O3	660 ms	567 ms