Welcome! This screencast shows how to obtain, install, and use ASAP
# Create a project folder
mkdir asap
cd asap
# Clone the source code
git clone git@github.com:dslab-epfl/asap.git
git clone http://llvm.org/git/clang.git asap/tools/clang
( cd asap/tools/clang && git checkout release_35 )
git clone http://llvm.org/git/compiler-rt.git asap/projects/compiler-rt
( cd asap/projects/compiler-rt && git checkout release_35 )
# Let's build ASAP
mkdir build
cd build
# For configuring, two settings are recommended
# - -G Ninja finishes the build sooner (you want your build ASAP, after all :) )
# - -DLLVM_ENABLE_ASSERTIONS=ON makes bugs a bit easier to understand
cmake -G Ninja -DLLVM_ENABLE_ASSERTIONS=ON ../asap
cmake --build .
# ASAP was built. Now let's try things out!
# Here, we add ASAP to the path so that we can more easily compile the benchmarks.
cd ..
PATH=$(pwd)/build/bin:$PATH
# There is a ready-to-use script to test ASAP with bzip2. It does the following:
# - Download bzip2 from the official website
# - Compile it without instrumentation (the baseline version)
# - Compile it with AddressSanitizer instrumentation.
# - Profile it. Bzip2 comes with a few tiny test files. Running these tests is good enough for ASAP.
# - Compile optimized versions with cost levels from 1% to 100%
mkdir bzip2
cd bzip2
../asap/lib/Transforms/SanityChecks/scripts/bzip2/build_bzip2.sh
# Let's inspect the result
ls -l
# We test the speed by measuring the time it takes to compress the ASAP source code
tar cf test-archive.tar ../asap/*
time ./bzip2-baseline-build/bzip2 --keep --force test-archive.tar
time ./bzip2-asan-c1000-build/bzip2 --keep --force test-archive.tar
# The baseline version took 31 seconds, whereas the AddressSanitizer-instrumented version takes 57 seconds.
# An overhead of 84%
# Let's see how ASAP reduces this overhead
time ./bzip2-asan-c0010-build/bzip2 --keep --force test-archive.tar
# ASAP has reduced the overhead to 6% (while keeping 78% of the instrumentation)
# That's it. Have a lot of fun!More by Sjlver
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