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Benchmark tests for json-c
General strategy:
-------------------
* Identify "after" commit hash
* Use provided directory
* Use provided commit hash
* Local changes in current working directory
* ${cur_branch}
* Identify "before" commit hash, in order of preference
* Use provided directory
* Use provided commit hash
* Use origin/${cur_branch}, if different from ${after_commit}
* Use previous release
* If not using existing dir, clone to src-${after_commit}
* or, checkout appropriate commit in existing src-${after_commit}
* Create build & install dirs for ${after_commit}
* Build & install ${after_commit}
* Compile benchmark programs against install-${after_commit}
* If not using existing dir, clone to src-${before_commit}
* or, checkout appropriate commit in existing src-${before_commit}
* Create build & install dirs for ${before_commit}
* Build & install ${before_commit}
* Compile benchmark programs against install-${before_commit}
* Run benchmark in each location
* Compare results
heaptrack memory profiler
---------------------------
https://milianw.de/blog/heaptrack-a-heap-memory-profiler-for-linux.html
```
yum install libdwarf-devel elfutils boost-devel libunwind-devel
git clone git://anongit.kde.org/heaptrack
cd heaptrack
mkdir build
cd build
cmake -DCMAKE_BUILD_TYPE=RelWithDebInfo \
-DCMAKE_INSTALL_PREFIX=$HOME/heaptrack-install ..
make install
```
Issues
--------
* jc-bench.sh is incomplete.
* valgrind massif misreports "extra-heap" bytes?
"json_parse -n canada.json" shows 38640 KB maxrss.
Using valgrind --tool=massif, a large amount of memory is listed as
wasted "extra-heap" bytes. (~5.6MB)
```
valgrind --tool=massif --massif-out-file=massif.out ./json_parse -n ~/canada.json
ms_print massif.out
```
Using heaptrack, and analyzing the histogram, only shows ~2.6MB
```
heaptrack ./json_parse -n canada.json
heaptrack --analyze heaptrack*gz -H histgram.out
awk ' { s=$1; count=$2; ru=(int((s+ 15) / 16)) * 16; wasted = ((ru-s)*count); print s, count, ru-s, wasted; total=total+wasted} END { print "Total: ", total }' histogram.out
```
With the (unreleased) arraylist trimming changes, maxrss reported by
getrusage() goes down, but massif claims *more* total usage, and a HUGE
extra-heap amount (50% of total).
|
