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There are four different strategies you can run: Scan1, Scan2, AVXScan1, AVXScan2 and each has a multithreading version.

• Scan1(Scan1_multithread_{inter/intra}query.c): use nested for loops
• Scan2(Scan2_multithread_{inter/intra}query.c): unroll the for loops that check the query terms
• AVXScan1(AVXScan1_multithread_{inter/intra}query.c): add SSE, AVX2 to Scan2
• AVXScan2(AVXScan2_multithread_{inter/intra}query.c): unroll for loop for looping docs based on AVXScan1
• AVXScan3(AVXScan3_multithread_{inter/intra}query.c): optimize AVXScan2's query evaluation with utilization of map
• AVXScan4(AVXScan4_multithread_{inter/intra}query.c): prestore score based on AVXScan3

1. You can clone the repo with the following command:

   $ git clone git://github.com/lintool/c-bfscan.git
   

2. Once you've cloned the repository, change directory into twitter-tools-core and build the package with Maven:

   $ cd c-bfscan/twitter-tools-core
   $ mvn clean package appassembler:assemble
   

3. Build the index on the data collection:

   $ sh target/appassembler/bin/IndexStatuses -collection {collectionPath} -index {indexPath} -optimize
   

4. Generate document pool, where the dataPath is the path that stores the document pool.

   $ sh target/appassembler/bin/GenerateStatistics -collection {collectionPath} -index {indexPath} -output {dataPath}
   

   If you would like to generate document pool using C, run the following:

   $ gcc -w GenerateStats.c -o GenerateStats 
   $ ./GenerateStats {collectionPath} {dataPath}
   

5. To format the efficiency topics (here we provide an efficiency file in /data/ folder) to TREC query format and get the top N topics, here lasttweetid indicates the last tweet id in the collection (Tweets2011: 35125724180516864, Tweets2013:318513034073100288) if you desire a bfs over the entire collection:

   $ sh target/appassembler/bin/FormatQuery -input ../data/05.efficiency_topics -top {N} -lasttweetid {lastTweetId} -output {queryPath}
   

6. Convert TREC query to the query that can be fed to c-bfscan, note that outputFile is the new format of the query and needs to be a .h file:

   $ sh target/appassembler/bin/GenerateQuery -index {indexPath} -query {queryPath} -output {newQuery.h}
   

7. Go back to the main repository:

   $ cd ..
   

8. To run different systems:

   Scan1_multithread_interquery:

   $ gcc -O3 -w -lm Scan1_multithread_interquery.c -o Scan1_multithread_interquery -lpthread -include {newQuery.h}
   $ ./Scan1_multithread_interquery {dataPath} {numThreads}
   

   Scan1_multithread_intraquery:

   $ gcc -O3 -w -lm Scan1_multithread_intraquery.c -o Scan1_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes.h}
   $ ./Scan1_multithread_intraquery {dataPath} {numThreads}
   

   Scan2_multithread_interquery:

   $ gcc -O3 -w -lm Scan2_multithread_interquery.c -o Scan2_multithread_interquery -lpthread -include {newQuery.h}
   $ ./Scan2_multithread_interquery {dataPath} {numThreads}
   

   Scan2_multithread_intraquery:

   $ gcc -O3 -w -lm Scan2_multithread_intraquery.c -o Scan2_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes.h}
   $ ./Scan2_multithread_intraquery {dataPath} {numThreads}
   

   To run AVX versions, make sure that your computer supports AVX2 instructions.

   AVXScan1_multithread_interquery:

   $ gcc -O3 -w -lm -msse4.1 -mavx2 AVXScan1_multithread_interquery.c -o AVXScan1_multithread_interquery -lpthread -include {newQuery.h}
   $ ./AVXScan1_multithread_interquery {dataPath} {numThreads}
   

   AVXScan1_multithread_intraquery:

   $ gcc -O3 -w -lm -msse4.1 -mavx2 AVXScan1_multithread_intraquery.c -o AVXScan1_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes_padding.h}
   $ ./AVXScan1_multithread_intraquery {dataPath} {numThreads}
   

   AVXScan2_multithread_interquery:

   $ gcc -O3 -w -lm -msse4.1 -mavx2 AVXScan2_multithread_interquery.c -o AVXScan2_multithread_interquery -lpthread -include {newQuery.h}
   $ ./AVXScan2_multithread_interquery {dataPath} {numThreads}
   

   AVXScan2_multithread_intraquery:

   $ gcc -O3 -w -lm -msse4.1 -mavx2 AVXScan2_multithread_intraquery.c -o AVXScan2_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes_padding.h}
   $ ./AVXScan2_multithread_intraquery {dataPath} {numThreads}
   

   AVXScan3_multithread_interquery:

   $ gcc -O3 -ffast-math -mfpmath=sse -funroll-loops -w -lm -msse4.1 -mavx2 AVXScan3_multithread_interquery.c -o AVXScan3_multithread_interquery -lpthread -include {newQuery.h}
   $ ./AVXScan3_multithread_interquery {dataPath} {numThreads}
   

   AVXScan3_multithread_intraquery:

   $ gcc -O3 -ffast-math -mfpmath=sse -funroll-loops -w -lm -msse4.1 -mavx2 AVXScan3_multithread_intraquery.c -o AVXScan3_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes_padding.h}
   $ ./AVXScan3_multithread_intraquery {dataPath} {numThreads}
   

   AVXScan4_multithread_interquery:

   $ gcc -O3 -ffast-math -mfpmath=sse -funroll-loops -w -lm -msse4.1 -mavx2 AVXScan4_multithread_interquery.c -o AVXScan4_multithread_interquery -lpthread -include {newQuery.h}
   $ ./AVXScan4_multithread_interquery {dataPath} {numThreads}
   

   AVXScan4_multithread_intraquery:

   $ gcc -O3 -ffast-math -mfpmath=sse -funroll-loops -w -lm -msse4.1 -mavx2 AVXScan4_multithread_intraquery.c -o AVXScan4_multithread_intraquery -lpthread -include {newQuery.h} -include {dataPath/termindexes_padding.h}
   $ ./AVXScan4_multithread_intraquery {dataPath} {numThreads}