COMP90024 Assignment 1 – The Happiest City solution




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Problem Description
Your task in this programming assignment is to implement a simple, parallelized application leveraging the
University of Melbourne HPC facility SPARTAN. Your application will use a large Twitter dataset, a grid/mesh for
Melbourne and a simple dictionary of terms related to sentiment scores. Your objective is to calculate the sentiment
score for the given cells and hence to calculate the area of Melbourne that has the happiest/most miserable people!
You should be able to log in to SPARTAN through running the following command:
with the password you set for yourself on karaage ( Thus, I would log
in as:
password = my karaage password (not my UniMelb password)
If you are a Windows user then you may need to install an application like Putty.exe to run ssh. (If you are coming
from elsewhere with different firewall rules, then you may need to use a VPN).
The files to be used in this assignment are accessible at:
• /data/projects/COMP90024/bigTwitter.json
o this is the main 14Gb+ JSON file to use for your final analysis and report write up, i.e., do not use
the bigTwitter.json file for software development and testing. Note that this data covers several
cities in Australia (not just Melbourne).
• /data/projects/COMP90024/smallTwitter.json
o smallTwitter.json this a 35Mb+ JSON file that can be used for testing;
• /data/projects/COMP90024/tinyTwitter.json
o tinyTwitter.json this a small JSON file that should be used for initial testing
o You may also decide to use the smaller JSON files on your own PC/laptop to start with.
You should make a symbolic link to these files, i.e. you should run the following commands at the Unix prompt from
your own user directory on SPARTAN:
ln –s /data/projects/COMP90024/bigTwitter.json
ln –s /data/projects/COMP90024/smallTwitter.json
ln –s /data/projects/COMP90024/tinyTwitter.json
Once done you should see something like the following in your home directory:
lrwxrwxrwx 1 rsinnott unimelb 40 Mar 22 15:06 bigTwitter.json -> /data/projects/COMP90024/bigTwitter.json
lrwxrwxrwx 1 rsinnott unimelb 39 Mar 22 15:06 smallTwitter.json -> /data/projects/COMP90024/smallTwitter.json
lrwxrwxrwx 1 rsinnott unimelb 38 Mar 22 15:06 tinyTwitter.json -> /data/projects/COMP90024/tinyTwitter.json
lrwxrwxrwx 1 rsinnott unimelb 41 Mar 22 15:06 melbGrid.json -> /data/projects/COMP90024/melbGrid.json
lrwxrwxrwx 1 rsinnott unimelb 42 Mar 22 15:06 AFINN.txt -> /data/projects/COMP90024/AFINN.txt
The melbGrid.json file includes the latitudes and longitudes of a range of gridded boxes as illustrated in the figure
below, i.e., the latitude and longitude of each of the corners of the boxes is given in the file.
The AFINN.txt file contains a list of words with a score related to the sentiment of the word, i.e., the extent that the
words are happy or sad. For example:
abandon -2
abandoned -2
abandons -2

happy +3

sad -2
Your assignment is to (eventually!) search the large Twitter data set (bigTwitter.json) and using just the tweet text
and the tweet location (lat/long) that contain exact matches of the terms in the AFINN.txt file, count the total
number of tweets in a given cell and aggregate the sentiment score for each grid cell for all of the data. The final
result will be a score for each cell with the following format, where the numbers are obviously representative.
Cell #Total Tweets #Overal Sentiment Score
A1 11,111 +123
A2 22,222 -234
A3 33,333 +345
A4 44,444 -456

D3 55,555 +678
D4 66,666 -789
D5 77,777 +890
Only exact matches are required for the tweet text. Thus “#abandon” or “@abandon” or “abandoning” or
“abandon23” or “abandon-COMP90024” etc are not an exact match and can be ignored. If a word ends in one of the
following forms of punctuation: ! , ? . ’ ” then it can be regarded as an exact match, e.g. “COMP90024 is a course
you should not abandon!” would match on “abandon”. A tweet may have multiple matches, e.g., “Sad to abandon
COMP90024” would score -4 (-2 abandon, -2 sad). The words should be treated as case insensitive, e.g., “Abandon”
and “abandon” and “AbAnDoN” can be considered as the same word and hence a match.
If a tweet occurs right on the border of two cells, e.g., exactly between the B1/B2 cell border then assume the tweet
occurs in B1 (i.e., to the cell on the left). If a tweet occurs exactly on the border between B2/C2 then assume the
tweet occurs in C2 (i.e., to the cell below).
Your application should allow a given number of nodes and cores to be utilized. Specifically, your application
should be run once to search the bigTwitter.json file on each of the following resources:
A1 A2 A3 A4
B1 B2 B3 B4
C1 C2 C3 C4 C5
D3 D4 D5
• 1 node and 1 core;
• 1 node and 8 cores;
• 2 nodes and 8 cores (with 4 cores per node).
The resources should be set when submitting the search application with the appropriate SLURM options. Note that
you should run a single SLURM job three separate times on each of the resources given here, i.e. you should not need
to run the same job 3 times on 1 node 1 core for example to benchmark the application. (This is a shared facility and
this many COMP90024 students will consume a lot of resources!).
You can implement your search using any routines that you wish from existing libraries however it is strongly
recommended that you follow the guidelines provided on access and use of the SPARTAN cluster. Do not for
example think that the job scheduler/SPARTAN automatically parallelizes your code – it doesn’t! You may wish to
use the pre-existing MPI libraries that have been installed for C, C++ or Python. You should feel free to make use of
the Internet to identify which JSON processing libraries you might use.
Your application should return the final results and the time to run the job itself, i.e. the time for the first job starting
on a given SPARTAN node to the time the last job completes. You may ignore the queuing time. The focus of this
assignment is not to optimize the application to run faster, but to learn about HPC and how basic benchmarking of
applications on a HPC facility can be achieved and the lessons learned in doing this on a shared resource.
Final packaging and delivery
You should write a brief report on the application – no more than 4 pages!, outlining how it can be invoked, i.e. it
should include the scripts used for submitting the job to SPARTAN, the approach you took to parallelize your code,
and describe variations in its performance on different numbers of nodes and cores. Your report should also include a
single graph (e.g. a bar chart) showing the time for execution of your solution on 1 node with 1 core, on 1 node with
8 cores and on 2 nodes with 8 cores.
The assignment should be submitted to Canvas as a zip file. The zip file must be named with the students named in
each team and their student Ids. That is, ForenameSurname-StudentId:ForenameSurname-StudentId might be
<SteveJobs-12345:BillGates-23456>.zip. Only one report is required per student pair.
The deadline for submitting the assignment is: Monday 14th April (by 12 noon!).
It is strongly recommended that you do not do this assignment at the last minute, as it may be the case that the
Spartan HPC facility is under heavy load when you need it and hence it may not be available! You have been
The marking process will be structured by evaluating whether the assignment (application + report) is compliant with
the specification given. This implies the following:
• A working demonstration – 60% marks
• Report and write up discussion – 40% marks
Timeliness in submitting the assignment in the proper format is important. A 10% deduction per day will be made
for late submissions.
You are free to develop your system where you are more comfortable with (at home, on your PC/laptop, in the labs,
on SPARTAN itself – but not on the bigTwitter.json file until you are ready!). Your code should of course work on