Wes J. Lloyd July 9, Colorado State University, Fort Collins, Colorado USA 2014 ESIP Summer Mee/ng
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1 Wes J. Lloyd July 9, 2014 Colorado State University, Fort Collins, Colorado USA 2014 ESIP Summer Mee/ng
2 Outline CSIP: Cloud Services InnovaBon PlaCorm ScienBfic Modeling Cloud Challenges The Virtual Machine ()- Scaler IntroducBon Support for Model Services Conclusion 2
3
4 Cloud Services Innova3on Pla5orm Provide scienbfic modeling- as- a- service (MaaS) Facilitate science research and delivery Increase availability and throughput of models Scalable cloud infrastructures: private, public, hybrid cloud Cost effecbve, component based, interoperable Integrated data services supporbng model parameterizabon Auditable with tracking system 4
5 Suppor3ng Science Discovery and Delivery USDA- ARS: AG Systems Model Research Deploy legacy model services Support new model development Harness scalable cloud resources Support asking new quesbons: monte carlo, model calibrabon USDA- NRCS: AG Systems ProducBon Models Support Field Offices consultabons with farmers Many agency models Deployed as desktop applicabons Infrequent manual updates 5
6 CSIP Model Services Scale Virtual Infrastructure Model Service Requests Tune System Parameters Tune Virtualization Parameters Load Balancer application servers Load Balancer distributed cache rdbms nosql data stores
7
8 Model Services Deployment Data Model Logging App Server Spa3al DB rdbms Services Services redis Apache Tomcat DODB / NOSQL Physical Server(s) Services
9 -image -image tomcat postgresql nginx postgis haproxy redis-server -image -image Service Isolation Model Application Stack -image -image
10 -image tomcat -image postgresql -image -image nginx haproxy Component Consolidation -image -image postgis redis-server
11 -image tomcat haproxy -image postgresql nginx postgis -image -image -image -image redis-server
12 -image tomcat haproxy -image postgresql nginx postgis -image redis-server
13 Elasticity Provisioning Variation
14 Server Consolidation
15 Resource Contention
16 Overprovisioning
17 Virtualiza3on Overhead Traditional Architecture Virtual Infrastructure 17
18 Amazon Spot Instances c1.xlarge dedicated instances 48 / hour (recently reduced!) Look what happened to pricing Cloud Virtual Machines AucBon based pricing mechanism Leverage unused cloud capacity at low cost Must manage modeling costs in response to market volablity Cheap Holidays 18
19
20 - Scaler Web services applicabon Rest- based/json Harnesses EC2/Eucalyptus API Manages virtual cloud infrastructure Supports scienbfic modeling- as- a- service Supports Amazon, Eucalyptus 3.x clouds Extensible to others, e.g. OpenStack future 20
21 - Scaler: Suppor3ng Features Pools Resource ublizabon data collecbon Resource ublizabon checkpoinbng Scaling Tasks Hot spot detecbon LeastBusy Placement LeastBusy Job Scheduling 21
22 Pools Supports work with many same- type s Size enforcement: minimum / maximum State: available / in- use OperaBons: execute common scripts across the pool Addresses launch latency Public cloud Spot instances Supports recycling 22
23 Resource U3liza3on Data Collec3on Resource ublizabon sensors Sensor on each /PM Transmits data to - configurable intervals CPU - CPU Bme - cpu usr: CPU Bme in user mode - cpu krn:cpu Bme in kernel mode - cpu_idle: CPU idle Bme - contextsw: # of context switches - cpu_io_wait: CPU Bme waibng for I/O - cpu_sint_bme: CPU Bme serving soe interrupts - loadavg: (# proc / 60 secs) Disk - dsr: disk sector reads - dsreads: disk sector reads completed - drm: merged adjacent disk reads - readbme: Bme spent reading from disk - dsw: disk sector writes - dswrites: disk sector writes completed - dwm: merged adjacent disk writes - writebme: Bme spent wribng to disk Network - nbr: network bytes sent - nbs: network bytes received 23
24 Resource U3liza3on Checkpoin3ng Captures resource ublizabon at Bme (T 0, T 1, T 2, T 3 ) Assigned a name Used to calculate resource ublizabon from Bme T x Synchronized samples used (within 1 second) Supports capturing total resource ublizabon for a model workloads executed across a pool of s Characterizes: CPU, disk I/O, network I/O ublizabon Supports dynamically scaled pools 24
25 Scaling Tasks Scaling service request Request to scale a specific applicabon Ber Prelaunch s: preprovision fixed # s (pools) SequenBal launch (increase by 1) Parallel many- launch (increase by many) *Future: Dynamic # of new s based on hot spot Handle launch failure Reschedule launches for Bmeouts and DOA s 25
26 Hot Spot Detec3on Resource ublizabon thresholds Scale when thresholds exceeded MAX CPU Bme, MIN CPU idle Bme, # of CPU context switches IniBal : evenly distributed homogeneous workloads Average of s: heterogeneous workloads Exponential moving average Performance model approach Predict future resource deficits Requires scaling training dataset Tests completed with mulbple linear regression 26
27 Least- Busy Placement RU- sensors collect Virtual/ Physical machine fixed intervals Busy- Metric used to calculate aggregate load at each physical machine Flexible metric design ObjecBve not to design perfect metric / scheduler Resource U3liza3on Data CPU - Total CPU Bme weighted 2X Disk - Disk sector reads (DSR) - Disk sector writes (DSW) Network - Network bytes sent (NBR) - Network bytes received (NBS) Virtualiza3on - Total count per host June 18, 2014 IEMSS 2014 The Virtual Machine () Scaler: An Infrastructure Manager Supporting Environmental Modeling on IaaS Clouds 27
28 Least- Busy Job Placement LeastBusy Distribute modeling requests to (PM) with lowest resource ublizabon Harnesses resource ublizabon data ApplicaBon agnosbc AlternaBve to tradibonal load balancer round- robin, least- connecbon job placement, eg. haproxy 28
29 Conclusion For more informabon: Wes Lloyd Colorado State University hkp:// 29
30
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