algorithm such as a simple polynomial based
algorithm. This wasnt done because testing
showed that the MD4 computation does not
provide a significant bottleneck on modern
CPUs. For example, on a 200 MHz Pentium
processor the MD4 implementation achieved 6
nine times the recommended daily allowance
of sugar, schools should be required to replace
the beverages in soda machines with healthy
alternatives. Notice that this thesis answers the
question, What should be done to reduce
sugar consumption by children
advantage of similarities if they exist; the
number of round trips should be kept to a
minimum to minimize the effect of transmission
latency; and the algorithm should be
computationally inexpensive, if possible. 3.2
Designing a remote update algorithm Sa
potential danger to customers. This is a strong
thesis statement because it takes a stand, and
because it's specific. 2. A strong thesis
statement justifies discussion. Your thesis
should indicate the point of the discussion. If
your assignment is to writ
research I had the opportunity to participate in
a cooperative research center research project
called the PIOUS project[Tridgell 1996] in which
I worked on a parallel filesystem for
multicomputers. This research led to the
creation of a parallel filesyst
The Australian Telecommunications and
Electronics Research Board, the Commonwealth
and the Australian National University were
very generous in providing me with scholarship
assistance. Thanks also to my family who have
been extremely understanding and su
A and uses these to construct ai . For this
algorithm to be effective and efficient we need
the following conditions: the signature R
needs to be cheap to compute at every byte
offset in a file; 6 I call them R and H for rolling
checksum and hash respecti
in the next chapter. 14It rises as n or n
depending on the definition of optimal. 3.3
Choosing the block size 58 some extra memory
and bookkeeping. 3.2.7 Reconstructing the file
One of the simplest parts of the rsync algorithm
is reconstructing the file o
showing how it can be implemented with
minimal memory overhead. Each stage of the
algorithm is analyzed more carefully resulting in
a more accurate estimate of the expected
running time of the algorithm. The algorithm
was first presented in [Tridgell and
mod M r2(k,L) = ( L1 i=0 (Li)ai+k) mod M
r(k,L) = r1(k,L) +Mr2(k,L) where r(k,L) is the
signature at offset k for a block of length L. M is
an arbitrary modulus, and was chosen to be 2
16 for simplicity and speed. Note that this
results in a 32 bit signat
applied to the processors so that comparisonexchange operations are replaced with merge
operations between processors. Batchers
algorithm is a sorting network[Knuth 1981],
which means that the processors do not need
to communicate in order to determine th
weak thesis statement for two major reasons.
First, world hunger can't be discussed
thoroughly in 7 to 10 pages. Second, many
causes and effects is vague. You should be able
to identify specific causes and effects. A revised
thesis might look like this: H
to, not everyone would agree on what should
be done or who should do it. You should note
that this fragment is not a thesis statement
because your reader doesn't know your
conclusions on the topic. Take a position on the
topic. After reflecting on the top
pass that leaves the vast majority of elements
in their correct final position. In the case of the
external algorithm this first pass is the natural
first step in the overall algorithm whereas for
the internal algorithm the first pass is logically
separat
stages. In the first stage each processor sorts
the data that happens to start in its local
memory and in the second stage the processors
exchange elements until the final sorted result
1Throughput this thesis logx will be used to
mean dlog2 xe. 1.1 How f
operation is replaced with a mergeexchange
operation. The restriction to equal-sized lists is
necessary, as small examples show5 . However,
a simple extension of the algorithm, which will
be referred to as in- finity padding, can remove
this restriction6
reader with a guide to your argument In
general, your thesis statement will accomplish
these goals if you think of the thesis as the
answer to the question your paper explores.
How to Generate a Thesis Statement if the
Topic Is Assigned Almost all assignm
of nodes so that both nodes end up with the
same number of elements, or as close as
possible. If the total number of elements
shared by the two nodes is odd then the node
with the lower node number gets the extra
element. Consequently if the total number
load balancing problems. All these features
make it very appealing. The fact that the final
result is not actually sorted is an annoyance
that must be overcome. Once the algorithm is
implemented it is immediately noticeable that
although the final result
signature table then a single byte literal is
emitted and the search continues at the next
byte13 . At first glance this search algorithm
appears to be O(n 2 ) in the file size, because for
a fixed block size the number of blocks with
matching 16 bit hash
totally lacked a parallel sorting routine. I had
been expecting that there would be a routine
that is the parallel equivalent of the ubiquitous
qsort() routine found in standard C libraries.
The lack of such a routine was quite a surprise
and prompted me
thoroughly enjoyable. That enjoyment is largely
a result of the interaction that I have had with
my supervisors, colleagues and, in the case of
rsync, the people who have tested and used the
resulting software. I feel very privileged to have
worked with m
not a problem except when disk space is very
tight. Even without this restriction it would, in
many cases, be wise for the reconstruction to
happen to a temporary file followed by an
atomic rename as otherwise the transfer would
be susceptible to network
sorting we can perform some simple
calculations which are very revealing and which
provide a great deal of guidance in the
algorithm design. It is well known that
comparison-based sorting algorithms on a
single CPU require logN! time1 , which is well
appr
files to be transferred through my modem for
archiving, distribution or testing on computers
at the other end of the link or on the other side
of the world. The time taken to transfer the
changes gave me plenty of opportunity to think
about better ways of