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From: Jeffrey Brown <jeffbrown.the_at_gmail.com>

Date: Mon, 12 Nov 2018 11:40:10 -0500

I want to write something resembling an editor for a graph database. I'm

wondering if Curry will be fast enough.

The data defining the graph would resemble the following:

type Address = Int

data Graph = Graph {

address :: Map String Address

content :: Map Address String -- `address` and `content` are inverses

children :: Map Label (Set Address)

parents :: Map Label (Set Address) }

I would define rules such as:

descendent :: Graph -> Index -> Index

descendent g i

-- If j is i's child, then j is i's descendent.

| Set.member j $ Map.lookup i $ children g

= j

descendent g i

-- If j is i's descendent and k is j's child, then k is i's descendent.

| descendent g i j

& (Set.member k $ Map.lookup k $ children g)

= k

I'll use hash maps unless their space requirements stop me.

I'm hoping the resulting code will quickly (say, in under a second) answer

queries over a few million nodes, along the lines of "the descendents of X

and Y, minus any descendents of Z or W". If an unbounded number of

generations proves computationally difficult, I would not be bothered by

needing to impose depth limits, ala "the first two generations of

descendents of X and Y, minus the first seven generations of descendents of

Z or W".

The graph would be sparse: with an average number of children well under

five, and few cycles.

Is this kind of performance a reasonable thing to expect from Curry? If so,

using which compiler? If not, can you recommend another language?

I know Haskell, and prefer it immensely to any other language. I am

reluctant to write a full application in a pure logic language like

Mercury, but I will if need be.

--

Jeff Brown | Jeffrey Benjamin Brown

Website <https://msu.edu/~brown202/> | Facebook

<https://www.facebook.com/mejeff.younotjeff> | LinkedIn

<https://www.linkedin.com/in/jeffreybenjaminbrown>(spammy, so I often miss

messages here) | Github <https://github.com/jeffreybenjaminbrown>

_______________________________________________

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Received on Mo Nov 19 2018 - 17:42:46 CET

Date: Mon, 12 Nov 2018 11:40:10 -0500

I want to write something resembling an editor for a graph database. I'm

wondering if Curry will be fast enough.

The data defining the graph would resemble the following:

type Address = Int

data Graph = Graph {

address :: Map String Address

content :: Map Address String -- `address` and `content` are inverses

children :: Map Label (Set Address)

parents :: Map Label (Set Address) }

I would define rules such as:

descendent :: Graph -> Index -> Index

descendent g i

-- If j is i's child, then j is i's descendent.

| Set.member j $ Map.lookup i $ children g

= j

descendent g i

-- If j is i's descendent and k is j's child, then k is i's descendent.

| descendent g i j

& (Set.member k $ Map.lookup k $ children g)

= k

I'll use hash maps unless their space requirements stop me.

I'm hoping the resulting code will quickly (say, in under a second) answer

queries over a few million nodes, along the lines of "the descendents of X

and Y, minus any descendents of Z or W". If an unbounded number of

generations proves computationally difficult, I would not be bothered by

needing to impose depth limits, ala "the first two generations of

descendents of X and Y, minus the first seven generations of descendents of

Z or W".

The graph would be sparse: with an average number of children well under

five, and few cycles.

Is this kind of performance a reasonable thing to expect from Curry? If so,

using which compiler? If not, can you recommend another language?

I know Haskell, and prefer it immensely to any other language. I am

reluctant to write a full application in a pure logic language like

Mercury, but I will if need be.

--

Jeff Brown | Jeffrey Benjamin Brown

Website <https://msu.edu/~brown202/> | Facebook

<https://www.facebook.com/mejeff.younotjeff> | LinkedIn

<https://www.linkedin.com/in/jeffreybenjaminbrown>(spammy, so I often miss

messages here) | Github <https://github.com/jeffreybenjaminbrown>

_______________________________________________

curry mailing list -- curry_at_lists.rwth-aachen.de

To unsubscribe send an email to curry-leave_at_lists.rwth-aachen.de

https://lists.rwth-aachen.de/postorius/lists/curry.lists.rwth-aachen.de

Received on Mo Nov 19 2018 - 17:42:46 CET

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