This document provides an outline and overview of a tutorial on executing applications on the Grid with COMPSs. The tutorial will cover the IS-ENES project, grid technology requirements for climate modeling, the COMPSs programming model, programming with COMPSs, COMPSs examples, and a hands-on session. It will also cover collecting requirements and concluding remarks. The programming model section will discuss StarSs, COMPSs objectives, the COMPSs programming steps, and the COMPSs IDE. Configuration of COMPSs projects and resources on grids and clouds will also be demonstrated.

1. www.bsc.es
Executing applications on the Grid with
COMPSs
IS-ENES NA2 – Tutorial Session
Roger Rafanell
Daniele Lezzi

2. Outline
• Introduction 13:30 - 14:00 (30 min.)
– The IS-ENES Project: The WP3/NA2 task
– Grid Technology: requirements for a climate grid
– Grid Prototype Infrastructure: design overview
• Programming Model 14:00 - 14:45 (45 min.)
– Overview of StarSs programming model
– Introduction to COMPSs
– Programming with COMPSs
– Configuring COMPSs & Extra features
• Demos 14:45 - 15:30 (45 min.)
– COMPSs examples
• Hands-on 15:30 – 16:30 (1 h.)
• Collection of requirements 16:30 – 17:00 (30 min.)
• Conclusion 17:00 – 17:30 (30 min.)

3. THE IS-ENES GRID TECHNOLOGY

4. IS-ENES Project: WP3/NA2
The WP3/NA2 aims at:
– Foster the deployment of a distributed e-Infrastructure within the
Earth System Modelling (ESM) community that will leverage on
the existing HPC ecosystems. This infrastructure or "virtual Earth-
System modelling Resource Centre (v.E.R.C.)" will consist of:
• The ENES v.E.R.C. Portal: an information and collaboration portal to present
all the services, tools and data available to the community.
• A unified HPC environment for ESM to ease and improve the utilization of
existing and upcoming High Performance Computing (HPC) environments.
• A prototype grid infrastructure used for training and for prototyping and testing
complex distributed workflows used by the ESM scientists.
The grid portal is one of services of the v.E.R.C.
portal: http://verc.enes.org/
4

5. Grid Technology and ESMs
Grid Technology allows the integration of heterogeneous computing
resources
– Critical factor: the heterogeneity can introduce differences on the
execution of the same model on different machines or different level of
code optimization can introduce a different order on the evaluation of the
floating-point expressions.
– ESM applications are very sensible to this kind of issues. For this reason,
the climate scientist, even when possible, does not migrate a running
experiment from a machine to another.
An exception is represented by ensemble experiments. For this kind
of experiments, composed by different members, the execution of
each member is allowed on a different cluster.
An ESM job is typically a very long job that requires large amount of
memory and data.
5

6. Grid Technology and ESMs
Requirements for a successful grid-based climate
application are:
– Failure awareness
– Check-pointing and restart
– Job monitoring
Fast access to storage and data from both computing and
post-processing.
The current Grid middleware does not fully meet these
requirements. Therefore, the development of a new
framework is necessary to use a distributed Grid
environment by climate modeling applications.
6

7. Design of the Grid architecture
COMPSs
COMPSs
COMPSs
COMPSs
COMPSs
COMPSs
7

8. Design of the Grid architecture
The user accesses the Job submission Web page for launching an
ensemble experiment.
The request is sent to the GRB Scheduler.
According to the scheduling policy, the GRB Scheduler distributes the
members to the available computing hosts.
Each computing host is accessible through a gateway host. This bring
the following advantages.
– All of the software stack required by the grid infrastructure will be installed only on
the gateway and not on the final HPC cluster (mainly devoted for production runs).
– Some eventual DoS attach will affect only the gateway host and not the HPC cluster
– The security policy defined by the administrator of the HPC cluster can be kept with
no modification.
The execution of the member is passed from the gateway to the HPC
cluster using SSH (gateway host and HPC machine are supposed to
be in the same subnet).
A COMPSs computation is started on the HPC cluster in order to
benefit from the automatic parallelization features.
8

9. THE STARSS PROGRAMMING MODEL

10. The StarSs programming model
CellSs
SMPSs
GPUSs
StarSs GridSs
ClusterSs Open Source
www.bsc.es/compss
ClusterSs
http://pm.bsc.es/ompss/
ClearSpeedSs
OmpSs COMPSs
@ SMP @ GPU @ Cluster • Programmability/Portability
– Incremental parallelization/restructure.
• StarSs – Focus in the problem, not in the hardware.
– Top/down programming.
– A “node” level programming model
– “Same” source code runs on “any”
– Sequential C/Fortran/Java + machine
annotations • Optimized task implementations
– Task based
– Simple linear address space
– Nicely integrates with other • Performance (Intelligent Runtime)
programming models (i.e., MPI) • Asynchronous (data-flow) execution and
– Natural support for heterogeneity locality awareness.
• Automatically extracts and exploits
parallelism.
• Malleable, matches computations to specific
resources on each type of target platform.

11. The StarSs programming model: granularities
StarSs
OmpSs COMPSs
@ SMP @ GPU @ Cluster
Average task Granularity:
100 microseconds – 10 milliseconds 1second - 1 day
Address space to compute dependences:
Memory Files, Objects
Language binding:
C, C++, FORTRAN Java, Python
11

12. INTRODUCTION TO COMPSS: OBJECTIVES

13. Introduction to COMPSs: Objectives
Reduce the development complexity of
Grid/Cluster/Cloud applications to the minimum
– Writing an application for a computational distributed
infrastructure may be as easy as writing a sequential application
Target applications: composed of tasks, most of them
repetitive
– Granularity of the tasks or programs
– Data: files, objects, arrays and primitive types
13

14. Programming with COMPSs– Data types
Type In a task In main program
Object • Method call
C c = a.task(b);
c.foo();
a: Callee
• Field access
b: Parameter int i = a.f;
c: Return value
Array Same as objects • Access to an element
int i = array[3];
File String file = “path/to/myFile”; • Stream creation:
task(file); FileInputStream fis =
new FileInputStream(file);
Primitive boolean b = task(2); Regular use
2: Parameter
b: Return value
14

15. Introduction to COMPSs
Parallel Resources
(a) Task selection +
Sequential Code parameters direction
Resource 1
...
for (i=0; i<N; i++){
(input, output, inout)
T1 (data1, data2);
T2 (data4, data5);
T3 (data2, data5, data6);
T4 (data7, data8);
T5 (data6, data8, data9); (d) Task completion,
}
... Resource 2
synchronization
T10 T20
T30
T40
...
(b) Task graph creation T50
T11 T21 Resource N
based on data (c) Scheduling,
T41
T31
dependencies data transfer,
T51 task execution
T12
…
15

16. Introduction to COMPSs
User code
initialize(f1);
for (int i = 0; i < 2; i++) {
genRandom(f2);
Annotated T1 T3
add(f1, f2);
}
interface
print(f2);
Custom Loader T2 T4
Grids
Javassist Clusters
Clouds
Files
16

17. Introduction to COMPSs
17

18. Programming with COMPSs - Steps
1) Selecting the tasks
o Regular Java methods
o External Services: SOAP WS operations
2 basic steps
2) Writing the application
o Programmed as a sequential code
o No API
o Automatic substitution of task calls /
synchronization
18

19. Programming model – Sample application
public static void main(String[] args) { Main program
String counter1 = args[0], counter2 = args[1],
counter3 = args[2];
initializeCounters(counter1, counter2, counter3);
for (i = 0; i < 3; i++) {
increment(counter1);
increment(counter2);
increment(counter3);
}
} Subroutine
public static void increment(String counterFile) {
int value = readCounter(counterFile);
value++;
writeCounter(counterFile, value);
}
19

20. Programming model – Sample app (interface)
Task selection interface
public interface SimpleItf {
Implementation
@Method(declaringClass = “SimpleImpl")
void increment(
@Parameter(type = FILE, direction = INOUT)
String counterFile
);
Parameter
}
metadata
20

21. Programming model – Task graph
Main loop
for (i = 0; i < 3; i++) {
increment(counter1);
increment(counter2);
increment(counter3);
}
Task graph
counter1 counter2 counter3
1st iteration
2nd iteration
3rd iteration
21

22. Programming with COMPSs - IDE
22 13

23. Programming with COMPSs - IDE
• Eclipse Plug-in:
• Support for application development
• Support for Task Interface generation
• Suport for configuration files generation (resouces and project)
23

24. COMPSs Grid Configuration - Project specification
Project.xml
<?xml version="1.0" encoding="UTF-8"?>
<Project>
<!--Description for any physical node-->
<Worker Name="172.20.200.18">
<InstallDir>/opt/COMPSs/Runtime/scripts/</InstallDir>
<WorkingDir>/tmp/</WorkingDir>
<User>user</User>
<LimitOfTasks>2</LimitOfTasks>
</Worker>
<Worker Name="172.20.200.18">
…
</Worker>
….
</Project>
24

25. COMPSs Grid Configuration - Resources specification
Resources.xml …
…
<Memory>
<Memory>
<PhysicalSize>1</PhysicalSize>
<PhysicalSize>1</PhysicalSize>
<VirtualSize>8</VirtualSize>
<VirtualSize>8</VirtualSize>
</Memory>
</Memory>
<ApplicationSoftware>
<ApplicationSoftware>
<?xml version="1.0" encoding="UTF-8"?> <Software>Java</Software>
<Software>Java</Software>
<ResourceList> </ApplicationSoftware>
</ApplicationSoftware>
<!--Description for any physical node--> <Service/>
<Service/>
<Resource Name="172.20.200.18"> <VO/>
<VO/>
<Capabilities> <Cluster/>
<Cluster/>
<Host> <FileSystem/>
<FileSystem/>
<TaskCount>0</TaskCount> <NetworkAdaptor/>
<NetworkAdaptor/>
<Queue>short</Queue> <JobPolicy/>
<JobPolicy/>
<Queue/> <AccessControlPolicy/>
<AccessControlPolicy/>
</Capabilities>
</Capabilities>
</Host>
<Processor> <Requirements/>
<Requirements/>
</Resource>
</Resource>
<Architecture>IA32</Architecture>
<Speed>3.0</Speed> <Resource Name="172.16.8.224">
<Resource Name="172.16.8.224">
<CPUCount>1</CPUCount> ...
...
</Processor> </Resource>
</Resource>
<OS> <ResourceList>
<ResourceList>
<OSType>Linux</OSType>
<MaxProcessesPerUser>32</MaxProcessesPerUser>
</OS>
<StorageElement>
<Size>30</Size>
</StorageElement>
…
25

26. COMPSs Cloud Configuration - Project specification
Project.xml
<Project>
<Project>
<Cloud>
<Cloud>
<InitialVMs>0</InitialVMs>
<InitialVMs>0</InitialVMs> …
<minVMCount>2</minVMCount>
<minVMCount>2</minVMCount> <ImageList>
<maxVMCount>5</maxVMCount>
<maxVMCount>5</maxVMCount> <Image name="debianbase">
<Provider name="BSCCloud">
<Provider name="BSCCloud"> <InstallDir>/opt/COMPSs/Runtime/scripts</InstallDir>
<LimitOfVMs>5</LimitOfVMs>
<LimitOfVMs>5</LimitOfVMs> <WorkingDir>/tmp/</WorkingDir>
<Property>
<Property> <User>user</User>
<Name>Cert</Name>
<Name>Cert</Name> <Package>
<Value>/home/.../cert.p12</Value>
<Value>/home/.../cert.p12</Value> <Source>/home/.../AppName.tar.gz</Source>
</Property>
</Property> <Target>/home/user</Target>
<Property>
<Property> </Package>
<Name>Owner</Name>
<Name>Owner</Name> </Image>
<Value>userbsc</Value>
<Value>userbsc</Value> </ImageList>
</Property>
</Property> <InstanceTypes>
<Property>
<Property> <Resource name="bsc.small"/>
<Name>JobNameTag</Name>
<Name>JobNameTag</Name> </InstanceTypes>
<Value>Job</Value>
<Value>Job</Value> </Provider>
</Property>
</Property> </Cloud>
…… </Project>
26

27. Programming Model – Heterogeneous Execution
28

28. Tracing - Overview
• COMPSs can generate post-mortem traces of the distributed
execution of the application.
• Useful for analysis and diagnosis.
• How it works:
• For each task execution and file transfer, an XML file is created to keep track
of that event.
• At the end of the execution, a perl script reads all the XML files and generates
a Paraver trace file.
• Traces can be visualized with the Paraver tool
• http://www.bsc.es/paraver
29

29. Tracing - Trace example
30

30. Tracing - Trace example
31

31. Tracing: Trace interpretation
• Lines in the trace:
• One line for the master
• N lines for the workers
• Meaning of the colours:
• Light blue: idle
• Dark blue: running a task
• Yellow/green: transferring data
• Red: waiting for data to be transferred
• Flags (events):
• Start / end of task
• Start / end of data transfer
32

32. EXAMPLES

33. BLAST example
VENUS-C Bioinformatics Scenario
BLAST (Basic Local Alignment Search Tool) Suite:
– BLAST: An algorithm for comparing primary biological
sequence information, such as the amino-acid sequences
of different proteins or nucleotides of DNA sequences.
BLAST enables a researcher to compare a
query sequence with a library or database
of sequences, and identify sequences that
resemble the query sequence above a certain
threshold.
34

34. BLAST example
• BLAST
Sequences
Sequences
Split
Split Reference
Reference
dbdb
Blast
Blast Blast
Blast Blast
Blast
Assembly
Assembly
Output
Output
35

35. BLAST example
Preparation of a COMPSs Package
• Creation the annotated interface for the selection of the remote tasks
public interface BlastItf { {
public interface BlastItf
@Method(declaringClass == "blast.BlastImpl")
@Method(declaringClass "blast.BlastImpl")
@Constraints(processorCPUCount == 4, memoryPhysicalSize = 4.0f)
@Constraints(processorCPUCount 4, memoryPhysicalSize = 4.0f)
void align(
void align(
@Parameter(type == Type.STRING, direction = Direction.IN)
@Parameter(type Type.STRING, direction = Direction.IN)
String databasePath,
String databasePath,
@Parameter(type == Type.FILE, direction = Direction.IN)
@Parameter(type Type.FILE, direction = Direction.IN)
String partitionFile,
String partitionFile,
@Parameter(type == Type.FILE, direction = Direction.OUT)
@Parameter(type Type.FILE, direction = Direction.OUT)
String partitionOutput,
String partitionOutput,
@Parameter(type == Type.STRING, direction = Direction.IN)
@Parameter(type Type.STRING, direction = Direction.IN)
String blastBinary,
String blastBinary,
@Parameter(type == Type.STRING, direction = Direction.IN)
@Parameter(type Type.STRING, direction = Direction.IN)
String commandArgs);
String commandArgs);
}}
36

36. BLAST example
Preparation of a COMPSs Package
• Main Application:
public static void main(String args[]) throws Exception {
sequences[] = splitSequences(inputFile, nFrags);
for (partition: sequences)
{
BlastImpl.align(database, partition, partitionOutput, blastBinary,
commandArgs);
partitionOutputs.add(partitionOutput);
}
assemblyPartitions(partialOutputs, outputFileName, tempDir, nFrags);
}
37

37. BLAST example
Preparation of a COMPSs Package
• Remote task implementation:
public class BlastImpl{
public void align(String databasePath, String partitionFile,
String partitionOutput, String blastBinary, String commandArgs)
{
String cmd = blastBinary+ " " +"-p blastx -d " + databasePath + " -i " +partitionFile+ " -o “+
partitionOutput+ " " +commandArgs;
Process simProc = Runtime.getRuntime().exec(cmd);
…….
}
}
38

38. BLAST example
Preparation of a COMPSs Package
 Compilation of the app and upload to the storage. The app will be deployed on
run time to cloud VM instances (configured on project.xml <Package> tag).
BlastItf.class
BlastItf.class
Blast.class
Blast.class
Blast.tar.gz
Blast.tar.gz Storage
Storage
BlastImpl.class
BlastImpl.class
Blast.jar
Blast.jar
blastx.exe
blastx.exe
39

39. HMMER example
HMMER
Protein Database Aminoacid Sequence
IQKKSGKWHTLTDLRA
VNAVIQPMGPLQPGLP
SPAMIPKDWPLIIIDLK
DCFFTIPLAEQDCEKFA
FTIPAINNKEPATRF
Model Score E-value N
-------- ------ --------- ---
IL6_2 -78.5 0.13 1
COLFI_2 -164.5 0.35 1
pgtp_13 -36.3 0.48 1
clf2 -15.6 3.6 1
PKD_9 -24.0 5 1
40

40. HMMER example
Aminoacid
sequence
41

41. HMMER example
String[] outputs = new String[numDBFrags];
//Process
for (String dbFrag : dbFrags) {
outputs[dbNum]= HMMPfamImpl.hmmpfam(sequence, dbFrag);
}
//Merge
int neighbor = 1;
while (neighbor < numDBFrags) {
for (int db = 0; db < numDBFrags; db += 2 * neighbor) {
if (db + neighbor < numDBFrags) {
HMMPfamImpl.merge(outputs[db], outputs[db + neighbor]);
}
}
neighbor *= 2;
}
42

42. HMMER example
public interface HMMPfamItf {
@Method(declaringClass = "worker.hmmerobj.HMMPfamImpl")
String hmmpfam(
@Parameter(type = Type.FILE, direction = Direction.IN)
String seqFile,
@Parameter(type = Type.STRING, direction = Direction.IN)
String dbFile
);
@Method(declaringClass = "worker.hmmerobj.HMMPfamImpl")
void merge(
@Parameter(type = Type.OBJECT, direction = Direction.INOUT)
String resultFile1,
@Parameter(type = Type.OBJECT, direction = Direction.IN)
String resultFile2
);
}
43

43. HMMER example
44

44. Ensemble Mean (IS-ENES) example
Multimodel Ensemble Mean
45

45. Ensemble Mean (IS-ENES) example
Preparation of a COMPSs Package
• Creation the annotated interface for the selection of the remote tasks
public interface JRA4 {
@Method(declaringClass = ”jra4.EnsembleImpl")
@Constraints(processorCPUCount = 1, memoryPhysicalSize = 1.0f)
void selyear(
@Parameter(type = Type.STRING, direction = Direction.IN)
String command,
@Parameter(type = Type.STRING, direction = Direction.IN)
String start_year,
@Parameter(type = Type.STRING, direction = Direction.IN)
String end_year,
@Parameter(type = Type.STRING, direction = Direction.IN)
String selmn_cmd,
@Parameter(type = Type.STRING, direction = Direction.IN)
String month,
@Parameter(type = Type.FILE, direction = Direction.IN)
String input,
@Parameter(type = Type.FILE, direction = Direction.OUT)
String model);
};
46

46. Ensemble Mean (IS-ENES) example
Preparation of a COMPSs Package
• Creation the annotated interface for the selection of the remote tasks
public interface JRA4 {
@Method(declaringClass = ”jra4.EnsembleImpl")
@Constraints(processorCPUCount = 1, memoryPhysicalSize = 1.0f)
void remapbil (
@Parameter(type = Type.STRING, direction = Direction.IN)
String command,
@Parameter(type = Type.FILE, direction = Direction.IN)
String model,
@Parameter(type = Type.FILE, direction = Direction.IN)
String outmalla);
@Parameter(type = Type.FILE, direction = Direction.OUT)
String outmodel);
};
47

47. Complex workflow examples (1)
48

48. Complex workflow examples (2)
49

49. HANDS ON

50. Hands-on
1. Hands-on: HRT application:
1. Application overview.
2. Configuration, compilation and execution.
1. COMPSs development VM (basic steps)
3. Monitoring and debugging
2. Feedback
51

51. High Resolution T129 (HRT) Overview
The HRT159 is a global coupled ocean-atmosphere general circulation model
(AOGCM) composed by:
• The global ocean model OPA8.2, with
a horizontal resolution of about 2◦ ATMOSPHERE (dynamics,
characterized by an equatorial physics, prescribed gases and
refinement (0.5◦) and 19 vertical Global aerosols)
levels. Atmosphere ECHAM5 T159 (~ 80 Km )
• The communication between the
atmospheric and the ocean model is
performed through the CMCC COUPLER Oasis 3
parallel version of OASIS3 coupler.
Global
Ocean OCEAN:
& Sea-Ice OPA 8.2/ORCA2 (2º)
SEA-ICE: LIM
52

52. HRT: Application Workflow
genConfigFile()
modeling()
mergeMonitorLogs()
Synchronizing
with last merged file
53

53. HRT: Task selection and invocation
• Complete the modeling method interface
• Complete the callee of genConfigFile method
• Write the mergeMonitorLogs method interface
54

54. HRT: Configuration, compilation and execution
• Project.xml: /opt/COMPSs/Runtime/xml/projects/project.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<Project>
<Project>
<!--Description for any physical node-->
<!--Description for any physical node-->
<Worker Name=“localhost">
<Worker Name=“localhost">
<InstallDir>/opt/COMPSs/Runtime/scripts/</InstallDir>
<InstallDir>/opt/COMPSs/Runtime/scripts/</InstallDir>
<WorkingDir>/tmp/</WorkingDir>
<WorkingDir>/tmp/</WorkingDir>
<User>user</User>
<User>user</User>
<LimitOfTasks>2</LimitOfTasks>
<LimitOfTasks>2</LimitOfTasks>
</Worker>
</Worker>
</Project>
</Project>
55

55. HRT: Configuration, compilation and execution
• Configuration: /opt/COMPSs/Runtime/xml/resources/resources.xml
<?xml version="1.0" encoding="UTF-8"?>
<?xml version="1.0" encoding="UTF-8"?>
<ResourceList> ……
<ResourceList>
<!--Description for any physical node-->
<!--Description for any physical node--> <Memory>
<Memory>
<Resource Name=“localhost">
<Resource Name=“localhost"> <PhysicalSize>2</PhysicalSize>
<PhysicalSize>2</PhysicalSize>
<Capabilities>
<Capabilities> <VirtualSize>8</VirtualSize>
<VirtualSize>8</VirtualSize>
<Host>
<Host>
</Memory>
</Memory>
<TaskCount>0</TaskCount> <ApplicationSoftware>
<ApplicationSoftware>
<TaskCount>0</TaskCount>
<Queue>short</Queue> <Software>Java</Software>
<Software>Java</Software>
<Queue>short</Queue>
<Queue/> </ApplicationSoftware>
</ApplicationSoftware>
<Queue/>
</Host> <Service/>
<Service/>
</Host>
<Processor> <VO/>
<VO/>
<Processor>
<Cluster/>
<Cluster/>
<Architecture>AMD64</Architecture>
<Architecture>AMD64</Architecture> <FileSystem/>
<FileSystem/>
<Speed>3.0</Speed>
<Speed>3.0</Speed> <NetworkAdaptor/>
<NetworkAdaptor/>
<CPUCount>2</CPUCount>
<CPUCount>2</CPUCount> <JobPolicy/>
<JobPolicy/>
</Processor>
</Processor> <AccessControlPolicy/>
<AccessControlPolicy/>
<OS>
<OS> </Capabilities>
</Capabilities>
<OSType>Linux</OSType>
<OSType>Linux</OSType> <Requirements/>
<Requirements/>
<MaxProcessesPerUser>32</MaxProcessesPerUser>
<MaxProcessesPerUser>32</MaxProcessesPerUser>
</Resource>
</Resource>
</OS>
</OS>
<StorageElement>
<StorageElement> <ResourceList>
<ResourceList>
<Size>30</Size>
<Size>30</Size>
</StorageElement>
</StorageElement>
… …
56

56. HRT: Configuration, compilation and execution
• Compilation (Eclipse IDE)
• Package Explorer -> Project (HRT) -> Export…
• Usage
• runcompss hrt.HRT <debug> <hrtscript> <user> <numTasks> <output>
<startdate> <duration>
• Execution
• cp /home/user/workspace/hrt/jar/hrt.jar /home/user
• export CLASSPATH=$CLASSPATH:/home/user/hrt.jar
• runcompss hrt.HRT true /home/user/workspace/hrt/binary/hrt.sh user 10
~/modelhrt/ 19600101 100000
57

57. HRT: Execution
----------------- Executing hrt.HRT in IT mode total--------------------------
[ API] - Deploying the Integrated Toolkit
[ API] - Starting the Integrated Toolkit
[ API] - Initializing components
[ API] - Ready to process tasks
HRT modeling Tool:
Parameters:
- Debug Enabled
- HRT script: /home/user/workspace/hrt/binary/hrt.sh
- User: user
- Number of modeling tasks: 10
- Output model path: /home/user/modelhrt/
- Model name: modelhrt
- Start date: 19600101
- Duration: 100000
Calculating the model:
- Merging files -> /home/user/modelhrt/monitoring/model_0.log and /home/user/modelhrt/monitoring/model_1.log
….
- Merging files -> /home/user/modelhrt/monitoring/model_0.log and /home/user/modelhrt/monitoring/model_8.log
Moving last merged file: /home/user/modelhrt/monitoring/model_0.log to /home/user/modelhrt/monitoring/modelhrt.log
[ API] - Opening file /home/user/modelhrt/monitoring/modelhrt.log in mode WRITE
modelhrt computed successfully in 356 seconds
[ API] - No more tasks for app 1
[ API] - Stopping IT
[ API] - Integrated Toolkit stopped
------------------------------------------------------------
58

58. HRT: Monitoring
• The runtime of COMPSs provides some information at execution time
so the user can follow the progress of the application
• Current graph: monitor.dot
• gencurrentgraph ~/monitor.dot
• Stats of the application: open monitor.xml with the browser:
• chromium-browser ~/monitor.xml
• # tasks
• Resources usage
• Execution time of each core
59

59. HRT: Debugging
• COMPSs can be run in debug mode showing more information about the
execution allowing to detect possible problems
• Enabled for this tutorial
• The user can check the execution of its application by reading:
• The output/errors of the main application (console)
• The output/error of a task # N
• ~/IT/[APP_NAME]/jobs/jobN.[out|err]
• Messages from the runtime COMPSs
• ~/it.log
• Task to resources allocation:
• ~/resources.log
• The user can verify the correct structure of the parallel application with a
complete application graph generated post-mortem
• gengraph $HOME/APP_NAME.dot
60

60. Conclusions
• Sequential programming approach
• Parallelization at task level
• Transparent data management and remote execution
• Can operate on different infrastructures:
• Cluster
• Grid
• Cloud (Public/Private)
• PaaS
• IaaS
• Web services
61

61. COMPSs Information
• Project page: http://sourceforge.net/projects/compss/
• Direct downloads page: http://compss.sourceforge.net/
• Sample applications & development virtual appliances
• Tutorials
• Red-Hat & Debian based installation packages
• …
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62. www.bsc.es
Thank you!
For further information please contact
roger.rafanell@bsc.es
daniele.lezzi@bsc.es