On Mon, Sep 8, 2014 at 9:32 AM, hyaticua <[email protected]> wrote:
> Reading the change log for 2.6.0, the C++ changes describe "Various speed > optimizations". > > Does anyone know what kinds of optimizations were included in the release > or what kind performance we should reasonably expect? I could not find > anything in a naive google search. > The performance improvements we have made are small changes that optimize very specific use cases/methods. For example, for the clear() method some redundant operations has been collapsed into one (e.g., "has_bits &= ~0x1;" and "has_bits &= ~0x2;" are merged into "has_bits = 0;"). The data members of a generated class is also reordered to have the most-frequently accessed members to appear early so they have smaller offsets. And a lot other such kind of changes. For these specific cases we benchmarked (like the performance of calling a clear() method repeatedly), the performance will be improved by 1% to 3%. Overall though, I won't expect users to see noticeable differences in their applications. For the parsing performance of protobufs, the numbers we have are around ~500MB/s (i.e., parsing a 100-bytes message takes about 200 nano-seconds). Serialization performance is on the same scale. Of course this result depends on message definitions / data / platform, you'd better have your own benchmarks for your own use case. I wound't expect the result to vary too much though. > > > Thanks, > H > > -- > You received this message because you are subscribed to the Google Groups > "Protocol Buffers" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/protobuf. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Protocol Buffers" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/protobuf. For more options, visit https://groups.google.com/d/optout.
