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From "liyunzhang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-18080) Performance degradation on VectorizedLogicBench#IfExprLongColumnLongColumnBench when AVX512 is enabled
Date Thu, 16 Nov 2017 05:43:00 GMT
liyunzhang created HIVE-18080:
---------------------------------

             Summary: Performance degradation on VectorizedLogicBench#IfExprLongColumnLongColumnBench
when AVX512 is enabled
                 Key: HIVE-18080
                 URL: https://issues.apache.org/jira/browse/HIVE-18080
             Project: Hive
          Issue Type: Bug
            Reporter: liyunzhang


Use  Xeon(R) Platinum 8180 CPU to test the performance of [AVX512|https://en.wikipedia.org/wiki/AVX-512].
{code}
#cat /proc/cpuinfo |grep "model name"|head -n 1
model name	: Intel(R) Xeon(R) Platinum 8180 CPU @ 2.50GHz
{code}
Before that I have compiled hive with JDK9 as JDK9 enables AVX512 
Use hive microbenchmark(HIVE-10189) to evaluate the performance improvement. It seems performance(20%+)
in cases in {{VectorizedArithmeticBench}},{{VectorizedComparisonBench}},{{VectorizedLikeBench}},{{VectorizedLogicBench}}
execpt {{VectorizedLogicBench#IfExprLongColumnLongColumnBench}},{{VectorizedLogicBench#IfExprRepeatingLongColumnLongColumnBench}}
and
{{VectorizedLogicBench#IfExprLongColumnRepeatingLongColumnBench}}.The data is like following
When i use Skylake CPU to evaluate the performance improvement of AVX512.
I found the performance in VectorizedLogicBench is like following
|| ||AVX2 us/op||AVX512 us/op ||  (AVX2-AVX512)/AVX2||
|ColAndColBench|122510| 87014| 28.9%|
|IfExprLongColumnLongColumnBench | 1325759| 1436073| -8.3% |
|IfExprLongColumnRepeatingLongColumnBench|1397447|1480450|  -5.9%|
|IfExprRepeatingLongColumnLongColumnBench|1401164|1483062|  -5.9% |
|NotColBench|77042.83|51513.28|  33%|

There are degradation in IfExprLongColumnLongColumnBench,IfExprLongColumnRepeatingLongColumnBench,
IfExprRepeatingLongColumnLongColumnBench, very confused why there is degradation on IfExprLongColumnLongColumnBench
cases.

Here we use {{taskset -cp 1 $pid}} to run the benchmark on single core to avoid the impact
of dynamic CPU frequency scaling.
my script
{code}
export JAVA_HOME=/home/zly/jdk-9.0.1/
export PATH=$JAVA_HOME/bin:$PATH
export LD_LIBRARY_PATH=/home/zly/jdk-9.0.1/mylib
for i in 0 1 2; do
java -server -XX:UseAVX=3 -jar benchmarks.jar org.apache.hive.benchmark.vectorization.VectorizedLogicBench
* -wi 10 -i 20 -f 1 -bm avgt -tu us >log.logic.avx3.single.$i & export pid=$!
taskset -cp 1 $pid
wait $pid
done

for i in 0 1 2; do
java -server -XX:UseAVX=2 -jar benchmarks.jar org.apache.hive.benchmark.vectorization.VectorizedLogicBench
* -wi 10 -i 20 -f 1 -bm avgt -tu us >log.logic.avx2.single.$i & export pid=$!
taskset -cp 1 $pid
wait $pid
done

{code}




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