Build Agent buildTmp directory getting fulled from long running build.

Hello,

I have a long regression test where I am getting test failures from the disk being full. I look at disk usages and I see that buildTmp is gaining several gigabytes per hour during the test.  Look at the directory I see a large number of files of the form ssd.*.tmp, ssd.*.tmp.0000, ssd.*.tmp .0001 with the *.0000 files being 18 MBytes each. Look at a 0000 file I see a command line that would be created and called during the tests. I expect to produce a few thousand of these files, which would correspond with the disk usage I am seeing.  

Is there a way to limit the production of these files? What are they?

Thank you very much for your help. 

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Chris.