ࡱ> `VbjbjlNvvvvD 4.4.4../hv`0L0000111[[[[6 \bh$jh_m&h61166&hvv00;h===6vR00[=6[==Rn<*n<WW"nW12=3M42111&h&h=111h6666d4.4..Tvvvvvv The VST data processing within the GRID Misha Pavlov(1), Juan M. Alcal(1), Edwin A. Valentijn(2) INAF-OA Capodimonte, via Moiariello 16, I-80131, Napoli, Italy Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands mike@na.astro.it  HYPERLINK "mailto:jmae@na.astro.it" jmae@na.astro.it valentyn@astro.rug.nl ABSTRACT The VLT Survey Telescope (VST) with its camera OmegaCam is a facility for large-format astronomical images. The VST + OmegaCam camera will start operations by the end 2006 at Paranal, in Chile and will produce about 150 Gbyte of raw data per night. Distributed parallel processing and storage are very important requirements for the VST/OmegaCAM data reduction. In this contribution we present the strategies and results of a study to use the INFN-GRID infrastructure for some calibration steps of the VST/OmegaCAM image data. Our study demonstrates a good scalability of INFN-GRID parallel executions. We also present results on the application execution times and tests of the storage element (SE). The usage of a GRID SE, as distributed storage, is reliable, flexible and robust. We also found that the I/O overhead is not critical for the data reduction application. In order to map-out jobs that are aborted and/or failed within the GRID, we present a POSIX-like job-control sub-system that can be implemented within the INFN-GRID. Keywords GRID, Wide-Field Imaging, parallel processing, image processing, VLT Survey Telescope Copyright is held by the author/owner(s). Grid WorkshoP 2005, November 15, 2005, Roma, ITALY. INTRODUCTION The VLT Survey Telescope (VST) is a collaboration between ESO, and INAF-OAC-Capodimonte. The single instrument for the VST, OmegaCam, is build by a European consortium led by NOVA the Netherlands. The telescope will have an aperture of 2.6m. The mosaic camera contains 32 CCDs (2k(4k chips, 15(m pixels). The corrected field of view of the system will be 1 square degree with a plate scale of 0.21 arcsec/pixel. The Sloan photometric system (u', g', r', i', z) will be adopted, but Johnson B and V filters will be also available. It is foreseen that VST will start operations by the end 2006 at Paranal, in Chile. The VST+OmegaCam instrument delivers an enormous data flow that calls for adequate planning, archiving, scientific analysis and support facilities: the expected VST data flow will be about 150 Gbyte of raw data per night, for 300 night/year for a initially planned 10 year lifetime The Italian project Enabling platforms for high performance computational GRIDS oriented to scalable virtual organisations started in 2002. The work package 10 (WP10) of this project is devoted to Astrophysical applications (see also Baruffolo et al. 2005, this volume). Under the framework of this WP, the INAF- OA-Capodimonte studied the possibility to use the GRID infrastructure for the calibration of the VST/OmegaCAM data. Given the embarrassingly parallel nature of the data processing, the porting of distributed storage sub-system and parallel executions sub-system to the GRID is very suitable and feasible. In this contribution we present the strategies and results of the application No.2 of the WP10, i.e. the access to a facility for the calibration of the VST/OmegaCAM images in the INFN-GRID environment. In Section 2 we shortly mention the Astro-Wise system which is build for the processing, handling and dissemination of the VST/OmegaCAM data, while in Section 3 gives a description of running some Astro-Wise task extracts within INFN-GRID. In Section 4 we report on the results of the exercises performed within the INFN-GRID using simple prototype tasks. Some ideas for the optimisation of the processing within the GRID are presented in Section 5 and in Section 6 we provide a summary. DATA PROCESSING PHILOSOPHY Many of the surveys with VST/OmagaCAM plan to use the Astronomical Wide-Field Imaging System for Europe (ASTRO-WISE:  HYPERLINK "http://www.astro-wise.org" http://www.astro-wise.org), build by an European consortium. The system is now in operation and aims to provide the European community with an astronomical survey system, facilitating astronomical research, data reduction, and data mining based on the new generation of wide-field sky survey cameras. In order to achieve this demanding task, Astro-Wise has developed its own compute-GRID and storage-GRID infrastructure, by which the user can select compute single hosts and clusters distributed over Europe at the Astro-Wise hosts. Web services, viewing the contents of the system and asking for jobs to be executed (targets being processed in Astro-Wise speak) are now in operation (www.astro-wise/portal). These GRIDs are not further discussed in this paper, instead we discuss here how certain tasks, jobs, or Astro-Wise target bundled into a kind of mini-pipeline can be executed on a outside GRID infrastructure, such as the INFN-GRID. All data reductions tasks specific for each of the 32 OmegaCAM chips will be run in embarrassingly parallel processing, while some other tasks, like global astrometric solutions and co-addition of images in mosaics will run on single nodes. The Astro-Wise parallel processing data reduction will be done on LINUX clusters, in Napoli on a Beowulf cluster (http://www.na.astro.it/beowulf, see also Grado et al. 2004). Figure 1 sketches local networks such as employed by Astro-Wise. Two main characteristics of the network are connections to parallel processors and to distributed storage, which are main ingredients of any GRID application. In the following sections we describe experiments with connecting some Astro-Wise sub-tasks to the INFN-GRID infrastructure.  Figure 1: Sketch of an Astro-Wise like local network, highlighting distributed storage and processing. THE APPLICATION WITHIN GRID The goal of this application within the WP10 was to study the use of GRID technology for the processing of Wide-Field astronomical Images that will be obtained with VST/OmegaCAM. In order to reach our goals we had to deal with two important issues: Distributed storage. The Astro-Wise system employs a "peer-to-peer" mechanism to access storage distributed over Europe. We have studied the possibility to connect this to the standard INFN-GRID elements, i.e. storage element and replica manager. It is indeed possible to integrate these elements after minor modifications. This is of crucial importance for users of both the GRID and Astro-Wise, because the GRID infrastructure shall allow standard access to data storage, not only within Astro-Wise but also for other astronomical GRID applications (e.g. data mining, other type of image processing, etc.) Parallel or distributed computation. An intensive study of the feasibility to send Astro-WISE tasks to the standard elements of GRID infrastructure (resource broker and scheduler) has been performed. Contrary to the previous point, it was found that more effort is necessary in order to execute Astro-Wise tasks including access to the Astro-Wise databases on the GRID. For the present exercise we have extracted Tasks from the Astro-Wise system, stripped them from data base requests and fed those to the GRID. (An AstroWise distributed processing system allowing to install on GRID nodes database clients and all other software components is in an advanced state of development, and will replace all the forthcoming, is not used for this exercise). For our study a C-library was developed, which provides an intermediate layer between computational program modules and I/O sub-system. This layer accepts generic I/O POSIX-like calls (open, close, read, write, seek) and translate them into appropriate storage-dependent I/O calls. The library provides uniform access from the computation part of applications to different storage systems. At the same time this library includes support for UNIX shared memory as possible storage type. This provides and effective and fast mechanism for the exchange of large data volumes between independent modules. The use of shared memory allows also asynchronous I/O operations, i.e. processing of data that might be done during I/O operations. Support for shared memory and for standard UNIX files systems was so far implemented. The library design provides a simple integration mechanism for another type of storages (FTP, HTTP, GridFTP), etc.). In other words, the designed library allows to create a modular pipeline without significant performance degradation, providing the means for the integration of different storage systems (the computational part is invariant) and, taking into account the embarrassingly parallel nature of the data reduction, supports various hardware platforms.  Figure 2: typical data flow for the processing within the GRID EXERCISES WITHIN THE GRID We have performed a series of exercises in order to verify the performance of the data processing within the INFN GRID context. As it was mentioned above, and as can be seeing from Figure 1, there are two main components of the VST/OmegaCAM reduction system: distributed storage and parallel processing. To perform our exercises, we took extracts of the Astro-Wise system to build a prototype. It uses GRID Storage Elements (SE) to store the input raw images, as well as the calibrated output frames. In Figure 2 the typical data flow for the processing within the GRID is illustrated. The standard GRID job scheduler is used in order to process the data in parallel: 32 CCD images are processed independently and in parallel. At the same time, this prototype allows to measure some critical overheads of the GRID execution. Jobs are sent through the user interface passing through the GRID scheduler. The codes to process the images are sent to the computational elements also through the user interface. The images are next retrieved from the storage elements and processed in parallel. The processed images are then stored in the storage elements and finally retrieved for scientific analysis. The results on the GRID performance reported in the next sections were obtained by running our test application within the INFN-GRID ( HYPERLINK "http://grid-it.cnaf.infn.it/" http://grid-it.cnaf.infn.it/). SCHEDULER Leap Time GRID job executions have a leap time, which was measured by using a "0 execution time" task. The results are illustrated in Figure 3. A leap time of about 5 minutes exists which can be attributed to the scheduler. This is significant for small/fast computational tasks or in applications that require a fast response (interactive application). However, for batch applications such delay is not an important issue.  Figure 3: GRID scheduler leap time (zero execution jobs). When outliers are not considered, the average scheduler leap time is about 5 minutes. PARALLEL PROCESSING The second important parameter is the scalability of parallel executions. To measure this parameter, extracts of the Astro-Wise calibration pipelines were used to create master-Bias and master-Flat images. As one can see from Figure 4, the execution time for 32 jobs launched in parallel is 23 times faster (about 700s) than when performing the same number of jobs sequentially (32(500s). Thus, the scalability of parallel executions is quite good.  Figure 4: histogram of parallel job executions. The average parallel processing time is less than 500 seconds. The maximum execution time is about 700 seconds. Sequential executions for the 32 OmegaCam CCDs would require about 32(500 seconds. DISTRIBUTED STORAGE An additional overhead, that might be significant for applications processing large data volumes, is caused by the Input / Output (I/O) operations through a Wide Area Network (WAN). The combination of a relatively fast network connection between GRID Computational Element (CE) and GRID Storage Element (SE) with the optimisation of GRID scheduler CE-SE "distances", can significantly minimise these overheads. We find that for 5 raw-bias frames, the GRID execution adds about 70s to the total execution time. In comparison with the job scheduler leap time this not significant. Note, however, that in this particular case the job scheduler CE-SE optimisation was not used. JOB MONITORING Other exercises concerned the monitoring of the number of lost and/or failed jobs. As can be seen from Figure 5, the situation at the INFN-GRID has improved considerably from February 2004 to September 2005. However, some problems regarding the delay of jobs still remain. In the following sections we propose some implementations for the mapping of the jobs within the GRID.   Figure 5: jobs execution histograms. The upper histogram shows the situation in February 2004, while the lower one refers to September 2004. OPTIMISATION WITHIN THE GRID In the exercises illustrated above, we found that a number of jobs were significantly delayed and/or aborted and some others forgotten. In order to resolve these problems, we have studied possible strategies for the optimisation of the jobs execution. In Figure 6 we show a flux diagram of a possible solution that could be implement within the GRID for the jobs that are failed. Likewise, Figure 7 illustrates a flux diagram of a possible solution that could be implemented within the GRID to solve the problem of the slow executions. In both schema a critical element is the wait/waitpid method/facility. Taking into account the fact that GRID job executions are very similar to UNIX background executions (e.g. Table 1), we can notice that one significant element is missed in the GRID EDG distribution. This is the 'wait/waitpid' facility. The 'edg-job-status' utility partially includes elements of 'wait/waitpid' in the sense that the output of 'edg-job-status' contains information about the jobs-return values. But at the same time, there is a caveat in the 'edg-job-status' utility mainly because of two reasons: the user has to inspect the 'edg-job-status' output manually and periodically the user has to develop his/her own (EDG version dependent) 'edg-job-status' output parser, which has to extract a job return value and convert it to parser's UNIX return code (standard way to manipulate jobs return/error codes within UNIX, which is especially important for scripting program languages sh, csh, perl, python, etc). This difference is very important, sometimes even critical, for applications which are manipulating GRID jobs non-interactively like those without operator. This is not only the case for the so called embarrassingly parallel executions or sequential ones, but also for those automatically started single GRID jobs, for instance by at/crontab. An additional advantage of such approach is that the manipulation with jobs-return values starts to be more simple and more standard for UNIX programmers. The main difference between 'wait/waitpid' and 'edg-job-status'-based wait-like facilities for the GRID is that the local computational resources are not used by application during 'wait/waitpid' calls. The application is just sleeping until the child process is finished. Thus, in order to perform job control manipulations in a fully automatic way, it is necessary to implement some modifications to the GRID middle-ware.  Figure 6: parallel executions management for failed jobs.  Figure 7: parallel executions management for slow executions. Table 1: Caption of Table 1 EDG GRIDUNIX/POSIX job controledg-job-submit  & (background job execution)edg-job-cancell Kill Edg-job-status ps, jobs (during execution)??? missed ???Wait (waitpid for perl/c/c++/) In order to have the possibility to map-out the submitted jobs that are failed and/or aborted within the GRID we have developed a prototype of POSIX-like Job-control sub-system. Such sub-system can be implemented within the GRID and is available at  HYPERLINK "ftp://ftp.na.astro.it/pub/astrobench/GRID/oac_grid_job_control.it.gz" ftp://ftp.na.astro.it/pub/astrobench/GRID/oac_grid_job_control.it.gz. A more detailed description of implemented utilities (with a full set of supported options) can be found in the README.grid-job-control file available within the package. Some of the implemented modifications are described in Table 2. With the collaboration of INF GRID staff, it may result very easy to add all the new functionalities/utilities of the Job-control sub-system to the standard INFN-GRID distribution. However, a real waiting (sleeping) feature of a wait function, would be more difficult to implement in the GRID middleware, because for the moment a notification mechanism is missed in the INFN GRID. For instance, in the current version of the middleware the UI is only the initiator of any network GRID session. But in order to be able to add the discussed feature, it is necessary to include some sort of network listener in the UI distribution, which will be able to receive some notification messages from the RB or the CE directly. The design, development and implementation of such mechanism would be the optimal solution, but it has to be definitely done by the INFN GRID staff. SUMMARY The GRID infrastructure may be considered as a possibility for the processing of the large amount of data that will be produced by VST/OmegaCAM. A study of the different possibilities for the integration of the GRID job scheduler to the Astro-Wise extracts was done, next to the Astro-Wise bound implementations which are not considered here. Our exercises, performed with a simple pipe-line prototype, demonstrate a good scalability of GRID parallel executions. On the other hand, we also found that, regardless of the application execution time, there is a significant leap time of about 5 minutes for whatever job which can be attributed to the scheduler. Other tests regarding the SE were performed. It is found that the usage of GRID SE, as distributed storage, is reliable, flexible and robust. Since the VST/OmegaCAM images will require a huge storage, the use of distributed GRID storage is a possible solution. We also found that the I/O overhead, typically about 1 min., is not critical for the data reduction application. We can conclude that GRID applications are very useful for Virtual Observatory (VO) like systems. The GRID, mainly as batch-system, is not suitable for interactive tasks: the schedulers leap time is about 5 minutes. A number of jobs within the GRID may be aborted and/or failed. In order to map-out such executions, a POSIX-like job-control sub-system was developed that can be implemented within the GRID. Table 2: some implemented facilities of the job control tool ToolDescriptionoac_grid_job_submitsubmits job and writes additional information, which are used by other utilities in a special spool directoryoac_grid_job_waitwaits for a specified GRID joboac_grid_job_cancelcancels GRID jobs with specified job ID(s)oac_grid_job_cleanremoves from spool directory all information related to GRID job(s)oac_grid_jobsprints information related to GRID job(s)oac_grid_job_outputprints job's stdout / stderr and copies other job's output files to the current sub-directory  ACKNOWLEDGMENTS We thank our colleagues of the GRID.IT project for the many fruitful discussions. In particular we thank A. Volpato, G. Taffoni, C. Vuerli, A. Baruffolo and L. Benacchio for the WP10 collaboration. M.P. acknowledges a fellowship from the FIRB project Enabling platforms for high performance computational GRIDS oriented to scalable virtual organisations. Astro-Wise is funded by the EU FP5 RTD programme, under the contract HPRI-2001-50057. We acknowledge discussions with G. Capasso, V. Manna and E. Cascon. We also thank our VST colleagues A. Grado, M. Radovich, R. Silvotti, F. Getman, E. Puddu and A. Volpiceli for the collaboration on the VST data reduction pipeline. REFERENCES Grado, A., Capaccioli, M., Silvotti, R., et al. (2004) Astronomische Nachrichten 325, 601 Baruffolo, A., et al. (2005), this volume     PAGE  ')58HK_bc  + , - |o|aT@a'jh8h>@UmHsHhg<h>@mH sH jh>@UmHsHhg<hiP@mH sH hg<h@T@mH sH h;@mH sH h;h;@mH sH h5.@mHsHh@T@mHsHh@Th@T@mHsHh;hiP@mHsHh;h>@mHsHh;h;@H*aJmHsHh;h@T@mHsHhiPh@T()c? U V W ` r s } 45Cx 4H&#$+D/0$gd-x'$a$gd C$a$ & F gd;<lVVV- = > ? 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