turnin performs terribly under heavy load

[Antonios A. Chariton]

Tests of turnin(1) under "heavy" load have been completed. More specifically, the following bash(1) command was issued to a debian computer:

while [ true ]; do printf "y\ny" | turnin assignment@course file.c & done

Although it is extremely unlikely that such a case will happen in a production environment, the whole purpose was to simulate race conditions, i.e. how turnin(1) handles submissions by users simultaneously.
Parts of the LOGFILE and the SHA256 files can be seen below:

LOGFILE

turnin 2.0: student -  1 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  2 09/21/14 15:07   1
turnin 2.0: student -  3 09/21/14 15:07   1
turnin 2.0: student -  4 09/21/14 15:07   1

turnin 2.0: student -  6 09/21/14 15:07   1
turnin 2.0: student -  6 09/21/14 15:07   1
turnin 2.0: student -  7 09/21/14 15:07   1
turnin 2.0: student -  6 09/21/14 15:07   1
turnin 2.0: student -  6 09/21/14 15:07   1

SHA256

4a28ddd1770703177a9e2dafd1e9a3aea3de53723e39d539de8358fff25d0afb  student-4.tgz
4a28ddd1770703177a9e2dafd1e9a3aea3de53723e39d539de8358fff25d0afb  student-5.tgz
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  student-6.tgz
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  student-18.tgz
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  student-18.tgz
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  student-6.tgz
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855  student-18.tgz