Hi Kenton, Thanks for your reply.
> You can't continue to use a Builder after calling build(). Even if we made > it so you could, it would be building an entirely new object, not reusing > the old one. We can't make it reuse the old one because that would break > the immutability guarantee of message objects. Hmm... that strikes me as strange. I understand that the Message objects are immutable, but the Builders are as well? I thought that they would work more along the lines of String and StringBuilder, where String is obviously immutable and StringBuilder is mutable/ reusable. > But seriously, object allocation with a modern generational garbage > collector is extremely cheap, especially for objects that don't stick around > very long. So I don't think there's much to gain here. While I agree that object allocation is relatively cheap in Java, I have noticed that if you generate a lot of garbage, you have to also spend some time tweaking the garbage collector settings to avoid long/ frequent garbage collection pauses. I know that there has been a lot of recent work done in Java 7 (and experimentally in Java 6) to avoid this, but I haven't had the opportunity to test this yet. In fact, I find that often times this is the real difference in performance between Java and C++ in the cases where C++ seems to perform significantly faster... different object allocation practices (but more importantly, implementation/design choices). I don't know how well this holds true for a spectrum of different usage patterns, but my experience has been more from the large scale data processing side of things. And don't get me wrong, I'm actually one of the few people (out of my closest colleagues) who think that data processing can and should be done in Java over C++, but that's another discussion entirely :) But while we're on the subject, I have been looking for some rough benchmarks comparing the performance of Protocol Buffers in Java versus C++. Do you (the collective you) have any [rough] idea as to how they compare performance wise? I am thinking more in terms of batch-style processing (disk I/O, parsing centric) rather than RPC centric usage patterns. Any experiences you can share would be great. Thanks! --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To post to this group, send email to protobuf@googlegroups.com To unsubscribe from this group, send email to protobuf+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/protobuf?hl=en -~----------~----~----~----~------~----~------~--~---
