Possible memory leakage issue in using gunrock::sssp::run

[lxrzlyr]

Describe the bug
There might be a GPU memory leak issue in the gunrock::sssp::run function in Gunrock during runtime.

To Reproduce
The issue can be reproduced by calling the function multiple times in a loop. The following code snippet is provided as an example:

for (auto i = 0; i < n_vertices; i++) {
single_source = i;
gpu_elapsed += gunrock::sssp::run(G, single_source, distances.data().get(), predecessors.data().get());
}

Replace lines 76-82 in examples/algorithms/sssp/sssp.cu with the provided code and compile the sssp, then the issue can be reproduced.

Expected behavior
The entire graph should be computed without any GPU memory overflow issues.

Screenshots

Environment (please complete the following information):
Ubuntu 20.04
NVIDIA Driver Version: 470.161.03
CUDA Version: 11.4
GCC/G++: 9.4.0

Additional context
Add any other context about the problem here.

[neoblizz]

Thank you, as I promised in the email, I will take a look at it!

[lxrzlyr]

Dear Maintainer， I am writing this email to extend my appreciation for your prompt reply and willingness to resolve the bug issue in Gunrock. Thank you so much for your time and effort in looking into it. I want to express how much I appreciate open-source projects like Gunrock that are made available to solve complex problems, and the hard work that goes into keeping them up to date and functional. With people like you working actively on them, we can depend on such software for our daily tasks. Thank you once again for your support and for addressing this issue so quickly. I look forward to more contributions from your team towards making the world of technology a better place. Best regards, Yelai Feng 钟离元偌 ***@***.***  

…

------------------ 原始邮件 ------------------ 发件人: "gunrock/gunrock" ***@***.***>; 发送时间: 2023年3月17日(星期五) 上午10:57 ***@***.***>; ***@***.******@***.***>; 主题: Re: [gunrock/gunrock] Possible memory leakage issue in using gunrock::sssp::run (Issue #1037) Thank you, as I promised in the email, I will take a look at it! — Reply to this email directly, view it on GitHub, or unsubscribe. You are receiving this because you authored the thread.Message ID: ***@***.***>

[neoblizz]

Been looking at it and it maybe trickier than I thought. I'll let you know in this issue if I find a fix.

[lxrzlyr]

Dear Gunrock maintainers,
I recently noticed that the latest release of Gunrock supports only up to two parameters, and it appears that the previous performance test scripts may no longer be applicable. I'm wondering if Gunrock still offers other interfaces for performance testing? Specifically, my concern is related to the throughput metrics of the SSSP API.
Thank you very much for your support and assistance.

[neoblizz]

In the develop branch git checkout develop we now have means to collect the previously available metrics and export them into a JSON file: https://github.com/gunrock/gunrock/blob/develop/examples/algorithms/sssp/sssp.cu