On running "git svn dcommit", git creates a separate commit in SVN for every local commit, one made since last syncing with SVN. Here is a way to combine all recent local commits into single commit for SVN.
If you have multiple commits piled up on your local system, you just need to run following commands:
git reset <hash tag of commit till which u need to combine>
git commit -am "your message"
Above commands will create one clubbed commit of all the commit till the hash tag used. Please Make sure to you add any new files using "git add <file>". "git commit -am " does not add new files by itself.
I have answered this question on stackoverflow. You can find more answers by expert users here.
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