Fantastic. Thanks for the summary, Feng!
On Monday, September 8, 2014 5:24:05 PM UTC-4, Feng Xiao wrote:
> On Mon, Sep 8, 2014 at 9:32 AM, hyaticua <corey....@motionreality.com
>> 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.
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