Andrew Stitcher created QPID-5780:
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Summary: Can Improve memory use by rearranging struct to remove
padding holes
Key: QPID-5780
URL: https://issues.apache.org/jira/browse/QPID-5780
Project: Qpid
Issue Type: Improvement
Reporter: Andrew Stitcher
Assignee: Andrew Stitcher
Priority: Minor
The C language rules allow compilers to add extra padding in the middle of
structs .Generally this is done to maintain the correct ABI alignment for the
members.
This means that by paying attention to the sizes of the members you can
eliminate the padding simply by putting the largest members (with the biggest
alignment constraint) first then the next then the next down to bitfields (if
you are using them).
Removing the padding can reduce the space used by structs and this can be
significant if enough of them are allocated.
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