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Hudson commented on THRIFT-1188: -------------------------------- FAILURE: Integrated in Thrift #1237 (See [https://builds.apache.org/job/Thrift/1237/]) THRIFT-1188 C++: Use bit fields for a more compact __isset struct (roger: rev 3c494114b16d2873ebd6f28297d3ae91843b065f) * compiler/cpp/src/generate/t_cpp_generator.cc > C++: Use bit fields for a more compact __isset struct > ----------------------------------------------------- > > Key: THRIFT-1188 > URL: https://issues.apache.org/jira/browse/THRIFT-1188 > Project: Thrift > Issue Type: New Feature > Components: C++ - Compiler > Affects Versions: 0.6.1, 0.7 > Reporter: Eric Rannaud > Assignee: Roger Meier > Fix For: 0.9.2 > > Attachments: thrift-cpp-isset-bitfield.patch > > > With the C++ generator, the __isset structure is made of bool fields. > For Thrift objects with many optional fields, the memory impact of the > __isset structure with respect to the actual data payload can be significant. > This patch simply turns each member of __isset into a 1-bit field. > This patch does not pack the structure as I'm not sure how this should be > handled in general. As is, it will depend on the compiler whether there is a > real size gain (with GCC 4.5 the struct is packed at all optimization levels). > To enforce packing in all cases, should I define a T_ATTRIBUTE_PACKED macro > in Thrift.h? That wouldn't work for compilers that use #pragma, however. -- This message was sent by Atlassian JIRA (v6.2#6252)