Re^2: Performance problem with Clone Method

I have implemented what you called Clone2 in place of my original clone and it does make a substantial difference.

The matrices I am working with are very large, on the order of hundreds by hundreds

As for changing algorithms, I wish I could but it is not an option, no other algorithm provides as simple of an implementation nor the ability to modify it as this one does. Just FYI, the algorithm I am working with is the Ullmann algorithm for finding maximum subgraph isomorphism.

Lastly, I should point out that I believe I might have been wrong about the number of times the clone method is being called. According to smallprof the original clone method is called 35Million times but I don't believe this is accurate. After replacing clone with clone 2, which should be called the same number of times smallprof says it is being called 1.06 Million times. I know this is ancillary but curious nonetheless. I don't know if this is an error/limitation with smallprof but its worth pointing out nonetheless.

Comment on Re^2: Performance problem with Clone Method

Replies are listed 'Best First'.
Re^3: Performance problem with Clone Method by BrowserUk (Patriarch) on Jul 26, 2011 at 23:51 UTC
I am working with is the Ullmann algorithm for finding maximum subgraph isomorphism I suspect that if you posted your implementation that its performance could be improved substantially. Especially if you are manipulating large 2D arrays of 0's & 1's much of the time. Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error. "Science is about questioning the status quo. Questioning authority". In the absence of evidence, opinion is indistinguishable from prejudice.	[reply]

Replies are listed 'Best First'.

Re^3: Performance problem with Clone Method
by BrowserUk (Patriarch) on Jul 26, 2011 at 23:51 UTC

I am working with is the Ullmann algorithm for finding maximum subgraph isomorphism

I suspect that if you posted your implementation that its performance could be improved substantially. Especially if you are manipulating large 2D arrays of 0's & 1's much of the time.

Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.

"Science is about questioning the status quo. Questioning authority".

In the absence of evidence, opinion is indistinguishable from prejudice.

[reply]