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2017-06-19T21:08:08Z quadresce__: hey guys, I was wondering what the best way to do efficient complex vector manipulation on a vector in foreign memory
2017-06-19T21:09:44Z quadresce__: I guess something like STATIC-VECORS, yes?
2017-06-19T21:09:47Z quadresce__: VECTORS*
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2017-06-19T21:12:35Z stassats: static vectors are not in foreign memory
2017-06-19T21:15:56Z quadresce__: Oh yeah, you're right.
2017-06-19T21:16:33Z quadresce__: I have these huge vectors that require me to compile my program with a huge heap size, and I feel that maybe moving them out of the heap might be a good choice.
2017-06-19T21:17:18Z stassats: efficient vector manipulation in foreign memory? C with SIMD intrinsics
2017-06-19T21:17:27Z quadresce__: But I'm looking to not break a lot of code by doing so (e.g., how well SBCL optimizes simple-array access and arithmetic)
2017-06-19T21:19:30Z quadresce__: Can I hack SBCL to use foreign memory but look at the pointer no differently than a simple-array allocated on the heap?
2017-06-19T21:20:11Z stassats: you can
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2017-06-19T21:24:57Z foom: SBCL can also generate efficient code for accessing a foreign array.
2017-06-19T21:25:14Z foom: That's simpler if you don't need it to interoperate with code expecting to use simple-vector routines.
2017-06-19T21:25:38Z stassats: can't really have simple-vector in foreign memory
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2017-06-19T21:25:49Z stassats: only specialized arrays
2017-06-19T21:26:25Z quadresce__: sorry, i mean specifically (simple-array (complex double-float) (*))
2017-06-19T21:26:45Z foom: yea, people have put specialized non-pointerful arrays in foreign memory.
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2017-06-19T21:27:07Z quadresce__: are there any examples of doing so somewhere?
2017-06-19T21:27:08Z stassats: but ordinary large arrays do not move
2017-06-19T21:27:13Z foom: It seems gross to me
2017-06-19T21:27:14Z stassats: and are not scanned
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2017-06-19T21:27:20Z stassats: so, you're unlikely to see any benefit
2017-06-19T21:27:48Z quadresce__: stassats, my use-case right now is that I have an application being deployed to many different kinds of compute configurations
2017-06-19T21:28:11Z quadresce__: some with more or less memory. And compiling the Lisp on a per-machine basis with per-machine info for heap size is cumbersome
2017-06-19T21:28:37Z stassats: compiling? you can change it without compiling
2017-06-19T21:29:33Z quadresce__: I think that's true if I want to give up my own command line argument handling for the application, IIRC
2017-06-19T21:32:28Z stassats: uhm, i'm not sure what you are referring to
2017-06-19T21:32:54Z stassats: you need a wrapper script, sure, but that's it
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2017-06-19T21:35:48Z pkhuong: it sounds like https://github.com/sionescu/static-vectors does what you want though.
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2017-06-19T21:46:43Z fe[nl]ix: quadresce__: (static-vectors:make-static-vector 5 :element-type '(complex double-float) :initial-element #C(1.0d0 2.0d0))
2017-06-19T21:47:03Z quadresce__: Yep, that's what I meant about STATIC-VECTORS. Maybe I was misinterpreted for some SBCL-specific thing
2017-06-19T21:47:41Z quadresce__: stassats: this might sound really dumb to you, but gaining Lisp adoption is pretty hard already, even for perfectly functional and requirements-satisfying applications. Making deployment more difficult with wrapper scripts and extra compile steps and so on is actually a pretty grating point to some
2017-06-19T21:47:51Z fe[nl]ix: SBCL has its own notion of static vectors, which is quite different
2017-06-19T21:48:11Z quadresce__: I see, sorry for the confusion.
2017-06-19T21:49:28Z fe[nl]ix: I'm surprised that it's so grating, given how python/ruby and pretty much everyone else has to do that
2017-06-19T21:50:08Z foom: quadresce__: I agree. SBCL's GC should work better.
2017-06-19T21:50:27Z fe[nl]ix: quadresce__: it's not worse than the rest except Go which was designed for static linking from the start
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2017-06-19T21:50:54Z quadresce__: fe[nl]ix: Yes it is a little counter-intuitive. There are worse and more ironic cases.
2017-06-19T21:52:56Z quadresce__: I think it mostly stems from the fact that people want to learn to "go through the motions" as few times as possible with a variety of tools. Even if you need wrapper scripts, weird "compile"/deployment steps, etc. with Python, they learned it once with their beloved tool, and don't want to learn it again for some wacky tool.
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2017-06-19T22:38:22Z pkhuong: quadresce__: building a container that only has an SBCL image isn't that bad.
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