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https://issues.apache.org/jira/browse/HIVE-18080?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16256474#comment-16256474
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liyunzhang commented on HIVE-18080:
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[~mmccline]: can you help see the issue? very thanks!
> 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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