Native-Task Performance Test Report
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1 Native-Task Performance Test Report Intel Software Wang, Huafeng, Zhong, Xiang, Intel Software Page 1
2 1. Background 2. Related Work 3. Preliminary Experiments 3.1 Experimental Environment Workbench Wordcount Sort DFSIO Pagerank Peculiarity CPU-intensive IO-intensive IO-intensive Map :CPU-intensive Reduce :IO-intensive Hivebench-Aggregation Map :CPU-intensive Reduce :IO-intensive Hivebench-Join Terasort CPU-intensive Map :CPU-intensive Reduce : IO-intensive K-Means Iteration stage: CPU-intensive Classification stage: IO-intensive Nutchindexing CPU-intensive & IO-intensive Cluster settings Intel Software Page 2
3 Hadoop version 1..3-Intel (patched with native task) Cluster size 4 Disk per machine Network CPU L3 Cache size Memory 7 SATA Disk per node GbE network E5-268(32 core per node) 248 KB 64GB per node Map Slots 3*32+1*26=122 Reduce Slots 3*16+1*13=61 Job Configuration io.sort.mb compression Compression algo Dfs.block.size 1GB Enabled snappy 256MB Io.sort.record.percent.2 Dfs replica Performance Metrics Data size before compressio n Data size after compressio n Native job run time(s Original job run time(s) Job performa nce improve- Map stage performa nce Intel Software Page 3
4 ) ment improve ment Wordcoun 1TB 5GB % 159.8% t Sort 5GB 249GB % 45.4% DFSIO-Rea 1TB NA % 26% d DFSIO-Wri 1TB NA % 7.9% te Pagerank Pages:5M 217GB % 133.8% Total:481GB Hive-Aggr Uservisits:5 345GB % 76.2% egation G Pages:6M Total:82GB Hive-Join Uservisits:5 382GB % 42.8% G Pages:6M Total:86GB Terasort 1TB NA % 19.1% K-Means Clusters:5 Samples:2G Inputfilesec ondample:4 M Total:378GB 35GB % 22.9% Nutchinde xing Pages:4M 22G NA % 13.2% Hi-Bench Job Execution Time Analysis Original mapred job runtime Native-Task job runtime Intel Software Page 4
5 Results Wordcount Job Details: Name Maps Reducers wordcount Job Execution Time(Original Wordcount) Job Execution Time(Native-Task Wordcount) Native-Task running state: Intel Software Page 5
6 Start time: 9:14 Finish time: 9:37 Original running state: Start time: 1:32 Intel Software Page 6
7 Finish time: 11:28 Analysis Wordcount is a CPU-intensive workload and it s map stage run through the whole job. So the native-task has a huge performance improvement Sort Job Details: Name Maps Reducers sorter Job Execution Time(Original Sort) Job Execution Time(Native-Task Sort) Native-Task running state: Intel Software Page 7
8 Start time ::25 Finish time :1:1 Analysis Sort is IO-intensive at both map and stage. We can see that it s time occupy the most of whole job running time, because of that, the performance improvement is limited DFSIO-Read Job Details: Name Maps Reducers Datatools.jar Result Analyzer 5 63 Intel Software Page 8
9 Job Execution Time(Original DFSIO-Read) Job Execution Time(Native-Task DFSIO-Read) DFSIO-Write Job Details: Name Maps Reducers Datatools.jar Result Analyzer Job Execution Time(Original DFSIO-Write) 1 5 Intel Software Page 9
10 Job Execution Time(Native-Task DFSIO-Write) 1 5 Native-Task running state: Aggregation start time: 9:58 Aggregation finish time: 1:19 Join start time: 1:19 Join finish time: 12:1 Original running state: Intel Software Page 1
11 Aggregation start time: 2:22 Aggregation finish time: 2:46 Join start time: 2:46 Join finish time: 22:45 Analysis DFSIO is IO-intensive both at read and write stage. It s bottleneck is network bandwidth so the performance improvement is limited Pagerank Job Details: Name Maps Reducers Pagerank_Stage Intel Software Page 11
12 Pagerank_Stage Job Execution Time(Original Pagerank) Job Execution Time(Native-Task Pagerank) Native-Task running state: Start time: 1:33 Intel Software Page 12
13 Finish time: 12:8 Original running state: Start time: 1:59 Finish time: 14:6 Analysis Pagerank is a CPU-intensive workload and it s map stage take about 5% of the whole job running time. So the performance improvement is obvious Hive-Aggregation Job Details: Name Maps Reducers INSERT OVERWRITE TABLE Intel Software Page 13
14 uservisits...sourceip(stage-1) Job Execution Time (Original Hive-Aaggregation) Job Execution Time(Native-Task Hive-Aggregation) Original running state: Start time: 15:52 Intel Software Page 14
15 Finish time :16:22 Analysis Hive-Aggregation is CPU-intensive at map stage and IO-intensive at stage. It s map stage occupy the most of running time and when it comes to stage, network bandwidth limits the performance. So the performance improvement at map stage is obvious Hive-Join Job Details: Name Maps Reducers INSERT OVERWRITE TABLE rankings_uservisi...1(stage-1) INSERT OVERWRITE TABLE rankings_uservisi...1(stage-2) INSERT OVERWRITE TABLE 99 1 rankings_uservisi...1(stage-3) INSERT OVERWRITE TABLE 1 1 rankings_uservisi...1(stage-4) Intel Software Page 15
16 Job Execution Time(Original Hive-Join) Job Execution Time(Native-Task Hive-Join) Original running state: Start time: 16:32 Finish time :16:58 Intel Software Page 16
17 Analysis Hive-join is a CPU-intensive workload and it s map stage takes a high percent of whole running time. So we can see at map stage, the performance is improved by native-task Terasort Job Details: Name Maps Reducers Terasort Job Execution Time(Original Terasort) Job Execution Time(Native-Task Terasort) 1 5 Native-Task running state: Original running state: Intel Software Page 17
18 Start time: 8:39 Finish time: 1:24 Analysis Terasort is CPU-intensive at map stage and IO-intensive at stage.it s map stage occupy the majority of the running time so there is a huge performance improvement at map stage K-Means Job Details: Name Maps Reducers Cluster Iterator running iteration 1 Cluster Iterator running Intel Software Page 18
19 iteration 2 Cluster Iterator running iteration 3 Cluster Iterator running iteration 4 Cluster Iterator running iteration 5 Cluster Classification 14 Driver running 15 Job Execution Time(Original Kmeans) Job Execution Time(Native Kmeans) Native-Task running state: Intel Software Page 19
20 Start time: 2:38 Finish time: 22:23 Original running state: Start time: 9:43 Finish time: 11:41 Intel Software Page 2
21 Analisys From the running state graph, we can see that the former 5 iteration is CPU-intensive and the last classification stage is IO-intensive. The two stages almost equally split the whole running time. So the performance improvement at map stage is evident Nutchindexing Job Details: Name Maps Reducers index-lucene /HiBench/Nutch/Input/indexes 8 Job Execution Time(Original Nutchindexing) Job Execution Time(Native Nutchindexing) Native-Task running state: Intel Software Page 21
22 Start time: 17:26 Finish time: 18:4 Original running state: Start time: 18:4 Intel Software Page 22
23 Finish time: 19:56 Analysis Nutchindexing is CPU-intensive at map stage but the stage take the majority of whole running time. So the performance improvement is not so huge. 3.4 Other related results Cache miss hurts Sorting performance 5 4 Sorting time increase rapidly as cache miss rate increase We divide a large buffer into several memory unit. BlockSize is the size of memory unit we doing the sorting. SortTime/ sort time/log(blocksize) sort time/log(blocksize) partition size reach CPU L3 cache limit log2(blocksize) Intel Software Page 23
24 3.4.2 Compare with BlockMapOutputBuffer Time /s Job Execution Time Breakdown(WordCount) NO Combiner, 16 mapper x 8 r, 4 nodes, 3 SATA/node 6MB per task, compression ratio: 2/1 BlockMapOutputBuffer collector native task collector 5 Avg job time(s) Avg map task time(s)avg task time(s) 7% faster than BlockMapOutputBuffer collector. BlockMapOutputBuffer supports ONLY BytesWritable Effect of JVM reuse 4.5% improvement for Original Hadoop, 8% improvement for Native-Task Intel Software Page 24
25 Effect of Task JVM Reuse Original Hadoop Improve 4.5% 51 Naitve-Task 472 No JVM-Reuse JVM-Reuse Improve 8% 4 nodes, 4 map slots per node Hadoop don t scale well when slots number increase 4 nodes(32 core per node), 16 map slots max, CPU, memory, disk are NOT fully used. Performance drops unexpectedly when slots# increase time/s Performance of different map slots total job time total map stage time(/s) 4 * 16 mapper slots 4 * 4 mapper Wordcount benchmark Intel Software Page 25
26 3.4.5 Native-Task mode: full task optimization 2x faster further for Native-Task full time optimization, compared with native collector Native Task modes: full task vs. Collector only Hadoop Original total job time() total map stage time() Native-Task(Collector) Native-Task(Full Task) Wordcount benchmark 4. Conclusions Intel Software Page 26
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