November 06, 2009 Re: the List example | ||||
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Posted in reply to Max Samukha | Max Samukha, el 6 de noviembre a las 11:10 me escribiste: > On Thu, 5 Nov 2009 21:29:43 -0300, Leandro Lucarella <llucax@gmail.com> wrote: > > >See my other response about efficiency of D when using new/classes a lot. You just can't do it efficiently in D, ask bearophile for some benchmarks ;) > > This is in part because D doesn't have a compacting GC. A compacting GC implies allocation speeds comparable with the speed of allocation on stack. I guess many bearophile's benchmarks do not account for GC collection cycles, which should be slower in C#/Java because of the need to move objects. I think, fair benchmarks should always include garbage collection times. I don't think it's slower, because GCs usually treat differently small and large objects (the D GC already does that). So very small objects (that are the ones more likely to get allocated and freed in huge ammounts) are copied and large objects usually not. Moving a small object is not much more work than doing a sweep, and you get the extra bonus of not having to scan the whole heap, just the live data. This is a huge gain, which make moving collectors very fast (at the expense of extra memory since you have to reserve twice the programs working set). -- Leandro Lucarella (AKA luca) http://llucax.com.ar/ ---------------------------------------------------------------------- GPG Key: 5F5A8D05 (F8CD F9A7 BF00 5431 4145 104C 949E BFB6 5F5A 8D05) ---------------------------------------------------------------------- Dale tu mano al mono, pero no el codo, dado que un mono confianzudo es irreversible. -- Ricardo Vaporeso. La Reja, Agosto de 1912. |
November 06, 2009 Re: safety model in D (A quick question) | ||||
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Posted in reply to Andrei Alexandrescu | Andrei Alexandrescu wrote:
> SafeD is, unfortunately, not finished at the moment. I want to leave in place a stub that won't lock our options. Here's what we currently have:
Is the whole SafeD thing trying to do something similar to Microsoft's "managed/unmanaged" code thing? I don't know much about it, but I had relegated the managed/unmanaged thing to being C++-like (unmanaged) or Java-like (managed). "Sandboxing", in short.
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