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1994-11-20
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DTA 1.00 (18.11.94) DTA
NAME
DTA - Data Transfer Analysis
SYNOPSIS
Gives a very general and simple analysis of transfer speeds.
INPUTS
FILE - File to test transfer of data with (Make it a LARGE one!)
RESULTS
The following is an example of some of the useful information DTA
will display for you.
CPU: 68040/68882
Volume: DH1 (DCFFS)
Processing file "dl:LionKing.lha".
Read 946054 bytes / 923.9K in 0 seconds and ~432129 microseconds.
Data Transfer Analysis (DTA) = 2.1M/second (2189286 bytes/second).
The idea behind this very simple/crude program is to give you an
average idea of how well your machine/controller/drive are performing
together. The whole "analysis" depends on the number of buffers and
what type of memory they are in, your drive/controller speed, your
system's CPU load, the maxtransfer and DMA settings, file system, ...
This program just samples the time, reads a LARGE file, and samples
the time again...
I wrote this to test the results of changing some settings with a
ZorroII (NonDMA) SCSI board with a friends A4000. We tried changing
the maxtransfer, buffer memory type & size, and changing the DMA mask.
On the whole we got the best results that were opposite of the
suggested ones. For example we set the DMA mask so we COULD DMA
into all our memory, which was surprising, BIG speed gain. We
also kept "ANY" for the buffer memory type, CHIP/24bitDMA was
actually somewhat slower... The big thing with his drive is the
maxtransfer. For whatever reason it will not allow a very large
one, we got the best result with a 128kb = $200000, however I would
suggect trying the default and doing a "Copy BUF=0 <largefile> to RAM:"
BUF=0 sets the buffer size to that of the file you are copying. If
your machine locks up then your drive requires a smaller maxtransfer.
This program was written for ourself to test some hardware. If
you find it usefull then please use it. If you think the results
are not all-together there then do not use it. I would suggest
only using it to compare changes that you are making to a drive.
NOTES
This software, in its unmodified form and in its entirity, may be
freely distributed as long as no profits are gained.
THIS SOFTWARE IS PROVIDED BY IMAGINE SOFTWARE INC. "AS IS" AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL IMAGINE SOFTWARE INC. BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
DTA 1.00 (18.11.94) Engineered by Trevor Andrews
Copyright 1994 Imagine Software, Inc. All Rights Reserved.
Imagine Software, Inc.
1218 South 5th Street
Lafayette, IN 47905-1716