overview

This repository is the implementation of [1].

• cpu: cpu based implementation using the parallel framework CILK_PLUS
• gpu: gpu based implementation using CUDA
• encoder: transform a SNAP graph data file into the randomized and compressed binary file
• workload: choose source vertices with specified features (e.g. top-10,top-1000) for a graph
• scripts: various useful scripts to run the experiments

prerequisite

GPU

• CUDA 7.0 or newer
• CUB 1.6.3 or newer, which should be installed in the same directory as this repository (can be installed somewhere elase but need to modify the makefile in 'gpu' folder). https://nvlabs.github.io/cub/

CPU

• GCC 5.4.0 or newer (GCC 4.8 with CILK_PLUS should be fine, but haven't been tested)
• boost 1.55 or newer

how to compile

To compile the program, enter into 'gpu', 'cpu', 'workload' and 'encoder' separately and then execute 'make'.

For 'gpu', you may need to mofity CFLAGS and INCLUDE in makefile, depending on the compute capability of your gpu and the directory of your CUB.

There are some flags that you can add in Makefile for compilation

• PROFILE: report useful information for defined profiling metrices
• PAPI_PROFILE, NVPROFILE, VALIDATE : deprecated, used during development

how to run

1. Prepare the data set

The input graph data file should be encoded as our binary format.

The program 'workload' reads in the SNAP data file, randomize the edges, calculate the 0-based vertex ids and generate a more compressed binary data file

(The SNAP format is a list of edges per line, where one line contains two vertex ids separated by tab or space).

As an example, download the youtube graph file from https://snap.stanford.edu/data/com-Youtube.html.

wget https://snap.stanford.edu/data/bigdata/communities/com-youtube.ungraph.txt.gz 

Then, REMEMBER to delete any line of comments starting with '#', as the input file to encoder should be made up of only edges.

./encoder input_filename reverse

The argument 'reverse' means whether to reverse the direction of the edges, which is normally set to 0. For our example, run:

./encoder $DATA_DIR/com-youtube.ungraph.txt 0

After executing this command, you could see an output file in the 'encoder' folder, i.e. com-youtube.ungraph.bin.

2. Prepare the source vertex

We run our experiment on the same set of source vertices.

'workload' can generate the source vertex ids with top-10, top-1000, and top-1000000 degrees in the graph. If you have chosen your own set of source vertices, you can just skip this step.

For convenience, you could directly use the pre-generated source vertices in the 'scripts/exp_vids' folder.

./workload filename directed is_window is_choose_outdegree

• directed: 1 for directed graph and 0 for undirected graph
• is_window: whether evaluating the degree of a vertex in the window of a graph, normally set to 0
• is_choose_outdegree: evaluate the out-degree or in-degree of a vertex As an example, run:

./workload $DATA_DIR/com-youtube.ungraph.bin 0 0 1

3. Run

The gpu and cpu implmentation has similar arguments, which we would explain as follows.

• -d: gDataFileName (the input graph file encoded as our binary form)
• -a: gAppType
• 0: rev push
• -i: gIsDirected (1 for directed graph, 0 otherwise)
• -y: gIsDynamic (1 for execution on streaming graph, 0 is deprecated)
• -w: gWindowRatio (#edges in the sliding window, by default 0.1 of the all edges)
• -n: gWorkloadConfigType 0: SLIDE_WINDOW_RATIO, 1: SLIDE_BATCH_SIZE (two modes for the dynamic graph: in mode 0, should set -r and -b; in mode 1, should set -c and -l)
• -r: gStreamUpdateCountVersusWindowRatio (the batch size is set to be the ratio of the window size, by default 1% of the window)
• -b: gStreamBatchCount (the number of batches)
• -c: gStreamUpdateCountPerBatch (the number of edges per batch)
• -l: gStreamUpdateCountTotal (the total number of edges)
• -s: gSourceVertexId
• -t: gThreadNum (by default 1)
• -o: gVariant (by default set to 0) 0: optimized, 1: fast frontier, 2: eager, 3: VANILLA
• -e: error tolerance (by default 1e-9)

EXAMPLE: ./pagerank -d ../data/com-dblp.ungraph.bin -a 0 -i 0 -y 1 -n 0 -r 0.01 -b 100 -s 1

EXAMPLE: ./pagerank -d ../data/com-dblp.ungraph.bin -a 0 -i 0 -y 1 -n 1 -c 100 -l 10000 -s 1

Users may be interested in the following three categories of arguments when they run the program:

• data file related arguments (-d, -i)
• execution related arguments: specify '-a' as 0 to enable reverse push; specify '-y' as 1 to execute on dynamic graphs; control thread numbers with '-t' if running multi-threaded mode; choose the source vertex with '-s'
• graph stream related arguments (-n, -r, -b, -c, -l): there are two modes for how graph streams arrive. The first is that in each batch a specific number of new edges arrive (the number is a ratio '-r' of the window size) and there are '-b' such batches. The second mode is that in each batch '-c' new edges arrive and there are '-l' edges in total. In the experiment, most of the time we use mode 0 with '-r 0.01 -b 100' and change different source vertices.

For your reference, we provide useful scripts in 'cpu' and 'gpu' folder as a hint for how to run the program.

reference

1. Parallel Personalized PageRank on Dynamic Graphs. Wentian Guo, Yuchen Li, Mo Sha, Kian-Lee Tan. VLDB 2017 .