BESIII physical offline data analysis on virtualization platform
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1 BESIII physical offline data analysis on virtualization platform Qiulan Huang Computing Center, IHEP,CAS CHEP 2015
2 Outline Overview of HEP computing in IHEP What is virtualized computing cluster? Why virtualized computing cluster? What we have done? Schedule BESIII jobs to virtual computing cluster Current status Conclusion Qiulan Huang/CC/IHEP 2015/4/10-2
3 HEP computing in IHEP Support several experiments BEPCII & BESIII Cosmic Ray/Astrophysics in Tibet DayaBay CMS, ATLAS experiments on LHC Accelerator-driven Subcritical System (ADS) China Spallation Neutron Source (CSNS) Future experiments Jiangmen Underground Neutrino Observatory:~500TB*10years Lhaasso:2PB per year after 2017,accumulate 20PB+ in 10 years Qiulan Huang/CC/IHEP 2015/4/10-3
4 Computing status in IHEP CPU cores ~ ~ 60 queues, managed by Torque Problems Low resource utilization Poor resource sharing Qiulan Huang/CC/IHEP 2015/4/10-4
5 What is virtualized computing cluster? KVM+OpenStack+Torque /maui: Integrated Openstack and Torque /maui to provide computing service based on IHEPCloud Virtual cluster and physical cluster work together When a job queue is busy, the jobs can be allocated to a virtual queue VMs are created according to application requirement Distributed computing User interface Resource Management Unified deployment (puppet) Send results Submit jobs CloudAPI(create/stop VMs) CloudScheduler Query load Schedule to virtual Queue IHEPCloud (Virtual queue) Monitoring Qiulan Huang/CC/IHEP 2015/4/10-5
6 Why? Advantages Improve resource utilization Improve the efficiency of resource scheduling Simplify management Elasticity Resources heterogeneous is transparent to applications and users Energy saving To solve problems The overall computing resources utilization rate is relative low IHEP Computing cluster supports various experiments such as BES, Daya Bay, YBJ Computing resource is separated by each experiment which cannot be shared. At a certain period of time, some subsets are busy, some subsets are idle. It leads to take much time to queue. Qiulan Huang/CC/IHEP 2015/4/10-6
7 What we have done? Qiulan Huang/CC/IHEP 2015/4/10-7
8 BESIII Offline software optimization BESIII analysis is I/O heavy Creating event metadata and doing pre-selection by metadata according to event property to reduce IO throughput significantly Raw Data DST Data TAG Data Event construction Tag event Event index Event TAG Event TAG Detailed: see xiaofeng s talk, track2, 12:00 16/4 (BESIII Physics Data Storing and Processing on HBase and MapReduce) Qiulan Huang/CC/IHEP 2015/4/10-8
9 Optimized KVM performance Benchmark testing by default CPU performance penalty of KVM is about 10% and IO is about 12% Network performance penalty is about 3% CPU affinity The process is bound to a specific CPU but not allowed to dispatch to the other ones No need to migrate process between processors frequently to improve cache hit rate Extended Page Table Disabled EPT: modprobe kvm-intel enable_ept=0 VCPU 0 affini 亲和性 ty CPU 0 VCPU 1 亲和性 affini ty CPU 1 Qiulan Huang/CC/IHEP 2015/4/10-9
10 HS06 Rate Optimized CPU performance Optimized CPU benchmark testing Specifications Intel(R) Xeon(R) CPU X5650(2.67GHz),8 CPU cores,24gb 内存 OS:SLC release 5.5 (Boron) el5.cve ,64bit KVM-83 Tools HEP-SPEC06 Optimized CPU performance increased about 3% / 通用格式 CPU Benchmark / 通用格式 / 通用格式 / 通用格式 / 通用格式 UnPinned Pinned Default / 通用格式 / 通用格式 VM0 VM1 VM2 VM3 VM4 VM5 VM6 VM7 Qiulan Huang/CC/IHEP 2015/4/10-10
11 BESIII jobs running in VMs(1) BES simulation job (BOSS ) event number=1000 BesRndmGenSvc.RndmSeed=483366; #include "$BESSIMROOT/share/G4Svc_BesSim.txt" #include "$CALIBSVCROOT/share/calibConfig_sim.txt" RealizationSvc.RunIdList= {-9989}; #include "$ROOTIOROOT/share/jobOptions_Digi2Root.txt" DatabaseSvc.SqliteDbPath="/panfs/panfs.ihep.ac.cn/home/data/dengzy/pacman_bak/database"; RootCnvSvc.digiRootOutputFile= "/scratchfs/cc/shijy/rhopi-bws rtraw"; MessageSvc.OutputLevel= 5; ApplicationMgr.EvtMax=10000; Test environment VM: 2 cores,2gb memory The job requires 22% CPU ability Physics machine: 8cores,16GB memory Test results Jobs running time in VM is 1:45:05 while in physical machine is 1:42:04 which indicates the performance penalty is about 2.9% The penalty is optimistic Qiulan Huang/CC/IHEP 2015/4/10-11
12 BESIII jobs running in VMs(2) BES analysis job(boss ) ApplicationMgr.EvtMax = 1E9 "/besfs2/offline/data/663-1/jpsi/tmp2/120520/run_ _all_file006_sfo-1.dst", "/besfs2/offline/data/663-1/jpsi/tmp2/120520/run_ _all_file006_sfo-2.dst" }; // Set output level threshold (2=DEBUG, 3=INFO, 4=WARNING, 5=ERROR, 6=FATAL ) MessageSvc.OutputLevel = 6; // Number of events to be processed (default is 10) ApplicationMgr.EvtMax = 1E9; ApplicationMgr.HistogramPersistency = "ROOT"; Testing specification VM: 1 CPU cores,2gb memory Physical machine: 8CPU cores,16gb memory Testing results Job running time in VM is 8:04:47 while in physical machine is 7:48:32 It takes more 975s in VM than in physical machine which illustrated the performance penalty is about 3% Qiulan Huang/CC/IHEP 2015/4/10-12
13 IHEPCloud Lauched in May A private Iaas platform aiming to provide a self-service cloud platform for users and IHEP scientific computing Open for any user who has IHEP account (>1000 users, >70 active users) Qiulan Huang/CC/IHEP 2015/4/10-13
14 CloudScheduler Integrated virtual computing cluster into the traditional physical cluster to optimize the resource utilization. Take fine-grained resource allocation to schedule tasks instead of taking nodes. Design flexible allocating policy to provisioning VMs dynamically, considering job types, system load and cluster real-time status. Schedule jobs to IHEPCloud Qiulan Huang/CC/IHEP 2015/4/10-14
15 Architecture of Cloudscheduler PBS (VM Queue) Expends the original Torque PBS to support vm queue. PBS (VM Queue) VM central controller A matcher between the various modules. Polling Calculate Publish VM job controller Central controller Provide job query service schedule the jobs running in virtual queue (record the jobs in database) VM resource controller Policymaker: make vm allocation strategy. VM controller: start or stop vm CloudAPI: a packaged module based on the openstack api and with some extension. Job agent(deployed in VMs) Pull jobs to run, return job exit status and transfer the output files VM Resource Controller Job agent IHEPCloud Job agent VM Job Controller Qiulan Huang/CC/IHEP 2015/4/10-15
16 Workflow PBS VM central controller VM Job Controller VM Resource Controller Job Agent Request: ask running number for each queue reply: job running number of each queue check the vm queue and resource status Reply: The maximum job number for queue Request: queue name Reply: job run and queue number of queue, VM ip addr scheduled jobs Request: VM tpye, total VM num and VM ip list scheduled jobs Reply: the num of active vm start/stop vm active vm number Qiulan Huang/CC/IHEP 2015/4/10-16
17 Push+Pull mode Pull and push mode Pull: allocate the cpu/core for BESIII jobs with suitable resource When new job is coming, the PBS will request VM central controller to get vm resource. VM central controller prepares corresponding resource for the job VMs request matched jobs Push: Cluster internal keeps the original way of push, schedule job into the virtualized queue. Be transparent to users Qiulan Huang/CC/IHEP 2015/4/10-17
18 VM allocating policy Allocating VMs dynamically Provisioning VM number is determined by current virtual cluster status How to allocate VMs according to load of cluster especially considering the information from monitoring system Configurable VM allocating strategy interface. Linear addition and subtraction. And so on Qiulan Huang/CC/IHEP 2015/4/10-18
19 Current status Completed the testbed Submitted hundreds of test jobs Still has some problems Sometimes message communicated between modules lost Jobagent service go to offline when not connect to the server side Next steps: Fix bugs Implement more vm allocation strategies Applied to other experiments like JUNO,DAYABAY,YBJ and so on. Provide online service in this year. Qiulan Huang/CC/IHEP 2015/4/10-19
20 Summary Creating event metadata can reduce the IO throughput significantly CPU and network performance of KVM is optimistic, which can meet the BESIII experiment s requirement Virtual computing cluster is a good supplement for the existing physical cluster Qiulan Huang/CC/IHEP 2015/4/10-20
21 Any Question? Qiulan Huang/CC/IHEP 2015/4/10-21
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