693 reputation
516
bio website
location South Korea
age 32
visits member for 3 years, 10 months
seen yesterday

Current tools.

  • OSX, iOS, FreeBSD.
  • C/C++/Objective-C, Cocoa, Xcode.
  • PostgreSQL.

Feel free to fix my grammar if it's wrong. I always appreciate!


Dec
6
awarded  Peer Pressure
Dec
5
comment How the Erlang get soft-realtime with GC?
@SK-logic I see. Now everything is clear to me. Thanks for making me to realise that. I think this kind of static allocation control is same on RAII systems. I think I will change some stance to RTGC stuffs!
Dec
5
comment How the Erlang get soft-realtime with GC?
@SK-logic Do you mean the GC system is reporting precise (or at least larger) unreclaimed memory size, and user need to adjust garbage generation by referring the information...?
Dec
5
comment How the Erlang get soft-realtime with GC?
Yes, this is unlikely to happen, but (IMO,) must be solved if we need a guarantee of time deadline.
Dec
5
comment How the Erlang get soft-realtime with GC?
@SK-logic My question comes from concern about memory pressure. If it guarantees fully distributed (over time) small collections, sometimes heavy collection workload will be deferred, and program may create more garbages while it has been deferred. If this continues, memory can be exhausted in short period. Naive GC solves this by performing eventual full GC, but it is impossible in RTGC. Then I have to tune garbage generation to fit to the GC distribution algorithm, but how can I guarantee (because it's RT) proper workload distribution without knowing GC timing...?
Dec
4
comment How the Erlang get soft-realtime with GC?
@SK-logic I agree that there're some RTGC implementations. Anyway I have a big question; How can you guarantee collection workload distribution where you cannot know the collection timing?
Aug
2
comment Can Swift be used for anything besides iOS and OSX apps?
IMO, Swift itself is not locked to objc. It is providing objc compatibility layer as an extension, and I think we can use it without objc runtime if we don't use the features.
Jul
9
comment How to present asynchronous state change in chart or diagram?
@KeesDijk I am sorry for my vague wording. I don't have solid academic foundation on this topic, and I was just looking for any nice way of visual representation of state transition for concurrent stuffs.
Jul
4
revised Can static and dynamically typed languages be seen as different tools for different types of jobs?
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Jul
4
revised How can Swift be so much faster than Objective-C in these comparisons?
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Jul
4
revised How can Swift be so much faster than Objective-C in these comparisons?
deleted 101 characters in body
Jul
1
revised How can Swift be so much faster than Objective-C in these comparisons?
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Jul
1
revised Can static and dynamically typed languages be seen as different tools for different types of jobs?
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Jun
14
revised Can static and dynamically typed languages be seen as different tools for different types of jobs?
added 160 characters in body
Jun
14
awarded  Yearling
Jun
14
revised How can Swift be so much faster than Objective-C in these comparisons?
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Jun
14
revised How can Swift be so much faster than Objective-C in these comparisons?
added 27 characters in body
Jun
14
comment How can Swift be so much faster than Objective-C in these comparisons?
@Asik OK I see your point. I agree that you can use value-type approach to avoiding GC, but I don't think that's an opt-out. It's just avoiding. Well, this seems to be a subtle difference of wording choice. Anyway I'll update my answer to reflect that. And I will regard unmanaged memory allocation stuff is something only for alien code (= external resource) unless you provide some proper details.
Jun
14
comment How can Swift be so much faster than Objective-C in these comparisons?
@Asik (1) GC/RC is invented only to serve ref-types - which have an identity. Then value-type doesn't seem to be in focus of this discussion. In addition, value-types can be equally available on any system, so it doesn't provide comparable differences. (2) The idea of allocating GC classes in unmanaged memory is interesting. Is this possible on .NET? I want you to provide some more details. I think I have to change my opinion if this is possible. (3) Latency issue is still remains because ref-types couldn't be removed completely.
Jun
12
revised I feel something uncomfortable with Haskell record syntax
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