Information Technology Reference
In-Depth Information
information system using the large hadron collider computing grid
application programming interface (LCG API). Binaries were then called
with the target and parameter settings transferred with the job. The
compressed result was stored on a storage element and registered in the
grid i le catalog. A backup copy was also generated on another storage
element. For the sake of simplii cation, the most relevant metadata relative
to the output (software, parameter settings, compounds database, etc.)
were stored in the name of the output itself. Output, errors, and account-
ing messages were transferred on the user interface.
Execution of FlexX jobs required handling l oating licenses. Each job
using FlexX software was contacting the Flexlm server at the beginning of
the job and asked for a license, namely an ASCII i le with specii c keys
generated for this server. Then the job was able to run without connection
to the license server. Accessing l oating licenses on the grid behind i re-
walls required known IP and the opening of two specii c ports for insti-
tutes hosting worker nodes.
14.3.2.2
Deployment
The deployment took place in July and August 2005. During this period,
ten users launched jobs from i ve user interfaces, monitoring the process
with the help of the WISDOM environment and interacting with the user
support of the EGEE project and the nodes administrators. For a total of
80 CPU years, 72,751 jobs were launched, producing 1 TB of data (500 GB,
doubled for the backup). Detailed analysis of the deployment can be found
in [11], from which Table 14.1 is extracted.
TABLE 14.1
Main Metrics from WISDOM First Data Challenge
Metrics
Total
FlexX Phase
Autodock Phase
Cumulated number of docked compounds
(in millions)
4127
3141
987
Effective duration
37 days
22 days
15 days
Number of docked compounds/hour
46,475
59,488
27,417
Crunching factor
662
411
1031
Number of jobs submitted
72,751
41,520
31,231
Number of grid computing elements used
58
56
57
Number of resource brokers used
12
12
11
Maximum number of jobs running in
parallel on the grid
1643
1008
1643
Volume of output data
946 GB
506 GB
440 GB
Total CPU time
80 years
29.5 years
50.5 years
Effective CPU time used by successful jobs
67.2 years
24.8 years
42.4 years
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