Poly/ML

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695 discussions

curl for Poly/ML and MLton
by kostirya＠gmail.com 30 Sep '16

30 Sep '16

Hello Let me introduce you the libcurl for Standard ML and http client with asynchronous support (via sml-ev) https://github.com/kni/sml-curl I hope someone will find it helpful. Nick. P.S. Output of asynchronous example: > ./t-ev-poly libcurl/7.46.0 OpenSSL/1.0.1p zlib/1.2.8 Request: https://www.google.com/ Request: http://sml-family.org/ Request: http://www.polyml.org/ Request: http://www.mlton.org/ Request: http://melsman.github.io/mlkit Answer: 200 (OK) http://www.polyml.org/ Request: http://www.smlserver.org Answer: 200 (OK) http://www.mlton.org/ Request: http://www.mpi-sws.org/~rossberg/hamlet/ Answer: 200 (OK) http://sml-family.org/ Request: http://www.smlnj.org/ Answer: 200 (OK) http://www.elsman.com/mlkit/ Request: http://www.pllab.riec.tohoku.ac.jp/smlsharp/ Answer: 200 (OK) https://www.google.com.ua/?gfe_rd=cr&ei= jCDuV47qFqfA7gSTsbhg Request: http://manticore.cs.uchicago.edu/ Answer: 200 (OK) http://www.mpi-sws.org/~rossberg/hamlet/ Answer: 200 (OK) http://www.smlserver.org/ Answer: 200 (OK) http://www.smlnj.org/ Answer: 200 (OK) http://manticore.cs.uchicago.edu/ Answer: 200 () http://www.pllab.riec.tohoku.ac.jp/smlsharp/

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New kqueue and epoll library for MLton and Poly/ML.
by kostirya＠gmail.com 22 Sep '16

22 Sep '16

Hello. Let me introduce you the kqueue (*BSD) and epoll (Linux) library for Standard ML (MLton and Poly/ML). https://github.com/kni/sml-ev I hope someone will find it helpful. Nick.

1 0

wrapping socket with tls
by philneaton95＠gmail.com 21 Sep '16

21 Sep '16

Hello! I've come to in impasse with Ponyo trying to access common REST APIs. I've gotten this far ignoring SSL but it's time to start attacking that. Has anyone done any work on SSL/TLS in Standard ML? I could not find anything on SML/NJ and MLton email archives (and couldn't find a reasonable way to search Poly/ML's). It seems like the Socket module makes the underlying socket int pointer completely opaque. Since that pointer is what you'd need to make the tls call to wrap it in a tls context, it seems like it won't be possible to use the Socket module. I hope I am mistaken because otherwise the necessary step will be to reimplement the Socket module functionality in Ponyo. Any thoughts or suggestions on moving forward? -- Phil Eaton

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Equality Type Parameter in Datatype Declaration
by tjark.weber＠it.uu.se 17 Sep '16

17 Sep '16

Hi, Is the following behavior (of Poly/ML 5.6) intended? > datatype ''a t = C of ''a; datatype 'a t = C of ''b Moreover, Poly/ML rejects a following > C 1.0; while SML/NJ accepts it. Best, Tjark

5 10

FFI overhead
by kostirya＠gmail.com 29 Aug '16

29 Aug '16

I noticed that PolyML FFI (v5.6, Foreign structure) 100 times slower than MLton and Haskell FFI, and 10 times than Perl. :-( But why? After all, Haskell uses also libffi... P.S. I used buildCall3 ((getSymbol libc "foo"), (cUlong, cString, cUint), cUlong) (0, s, String.size s) and buildCall3 ((getSymbol libc "foo"), (cUlong, cPointer, cUint), cUlong) (0, s, String.size s) for test. Nick.

2 2

Interpretation of the profiler output data.
by kostirya＠gmail.com 19 Aug '16

19 Aug '16

Hello. There is profiler output for ProfileTime profileMode: 10 GARBAGE COLLECTION (total) 11 servers_stream(5)c_cb(1) 12 ForeignMemory.addFree(2) 12 VectorSliceOperations().subslice(3) 13 ForeignMemory.memoise(2)(1) 14 main_handle(1) 15 Int.scan(3)read_digits(3) 17 client_stream(7)to_channel(2) 18 ForeignMemory.memoise(2)(1) 23 client_stream(7)s_cb(1)(1) 29 ThreadLib.protect(3) 30 String.concat(1) 35 CoParser.takeStr(1)(1) 41 Substring.string(1) 109 CRC32.crcstringi(2)loop(2) 329 EV.kevent(4) 1132 Socket.recvVec'(3) Where can I get to know the meaning of these numbers? Best regards, Nick.

2 2

reasonably reliably inducing a "run out of store" runtime error in OSX with 5.6 (and a fix!?)
by Michael.Norrish＠data61.csiro.au 09 Aug '16

09 Aug '16

I don't have a small reproduction of the issue, but if you use bin/Holmake --qof with HOL4 at SHA1 6bf2bfd with the following file on a quiet (without much else running at the same time) Macbook Pro (OSX 10.11.6) open HolKernel boolLib bossLib Parse val _ = new_theory"foo248" val _ = Define`foo a b = a < b` val _ = overload_on("<:",``\a b. foo b a``) val _ = export_theory() then you will almost certainly get the following error out of Poly: Run out of store - interrupting threads The file is being read into Poly through a custom use function with its own lexer (to handle the backquotes) with calls to PolyML.compiler. If you add a semicolon at the end of the second line, you don't get the error. With just a bit of load, the error is harder to get. Michael

1 0

Performance of polyml compiler
by acn1＠cam.ac.uk 16 Jul '16

16 Jul '16

Let me start with a disclaimer and explanation. I wanted to have font metrics for a set of Unicode fonts available to some SML code. The metrics are extracted from the font by a cascade of programs and I already had code to inject them into C projects by creating files that went static font_info[] = { ... ... ... }; with MANY lines of simple static data. Doing things that way puts the metric data instantly available within my program. I modified things to create the same in SML and ended up with val metrics = Vector.from List [ Vector.fromList [a,b,c,d,e,f], Vector.fromList [a,b,c,d,e,f], .. ]; with around 10000 entries in the top level list. This was simple to do and in particular simpler both now and for when/if the code gets used by people. In particular simpler than anything that has SML code that reads the metric data from a resource file. And I am only interested in the metrics I have right now and am not concerned about future expansion there. Processing the input there works, but takes around 10 minutes of a reasonably fast desktop machine. That felt pretty bad. If I change the code to go (as it were) [[x,x,x,x] @ [x,x,x,x] @ [x,x,x,x]] at the top level with say 200 "x"s in each segment and 50 segments then the code is processed in more like 10 seconds rather than 10 minutes. This feels as if it is probably a really easy case where some aspect of processing lists in the input has been coded with quadratic growth rate in a way that is probably not necessary (the fact that the version segmented using "@" gets handled faster reassures me of that). A really easy demo if this is just val l = length [ Vector.fromList [0], ... ]; with 10000 entries in the list. I understand very happily that this is pathological code that nobody would ever write by hand and that as a way of handling data can be viewed as inflexible and crude. I am also happy that I can work round it using "@" and so it is not holding me up - but it felt as if it might be worth reporting and my expectation is that a very small change to the code would address it. I had looked and the code getList in SKIPS_.ML might have been the issue, but when I recode that to build the list backwards and then reverse at the end that does not unclog things, so the issue is at least one step deeper. Arthur

3 3

Socket.connectNB
by kostirya＠gmail.com 21 Jun '16

21 Jun '16

Hello, all. Socket.connectNB behaves oddly in Poly/ML. We get raise SysErr immediately after Socket.connectNB to a non-existent server. However, it is a nonblocking connect, so we should get information about unsuccesful connecton only after socket access. The source code is attached and here is the results for Poly/ML: > ./a.out exc in 2 socket: SysErr ("Connection refused", SOME ECONNREFUSED) exc in 3 socket: SysErr ("Connection refused", SOME ECONNREFUSED) exc in 4 socket: SysErr ("Connection refused", SOME ECONNREFUSED) . . ^C > ./a.out exc in 1 socket: SysErr ("Connection refused", SOME ECONNREFUSED) exc in 2 socket: SysErr ("Connection refused", SOME ECONNREFUSED) exc in 3 socket: SysErr ("Connection refused", SOME ECONNREFUSED) exc in 4 socket: SysErr ("Connection refused", SOME ECONNREFUSED) . . ^C We usually get errors in this situation. I've tested on Linix and FreeBSD. MLton and SML/NY don't get errors in the same situation. NIck.

2 4

not printed exception when executed file
by kostirya＠gmail.com 16 Jun '16

16 Jun '16

Hello. Why when executed file, exception is not printed? Is it OK? > cat foo.sml exception Ex fun main () = ( print "Start\n"; raise Ex; print "The End\n" ) > ( cat foo.sml ; echo 'val _ = main ()' ) | poly Poly/ML 5.6 Release Start Exception- Ex raised > polyc foo.sml && ./a.out Start > Best, Nick.

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