On Apr 28, 2010, at 8:18 PM, iJohn wrote:
It's easy enough to get a ballpark guess figure these days with
Win 7 by just moving files and asking for "details". I don't know how
to guess at transfer speeds in OS X though ... except by copying a
file and measuring the time by watching the clock.
Your computer is VASTLY better at watching the clock. The built-in (at
least in bash, if your shell is csh it's different) cammand 'time'
will tell you how long any unix command or script takes to execute.
In our case I want to time copying a file from one place to another,
from my hard drive to my thumb drive
time cp <filename on one drive> <filename on another drive>
You can move several known files, or use a file I made a long time ago
for some network throughput testing I had to do:
<http://dbdev2.pharmacy.arizona.edu/miscjunk/test1mb.txt>
This is a 1024 KB random text file. Save it, you can concatenate
however many copies that you want to make a sizeable file.
for example, I did:
Here's my script, saved as speed.sh: (This is quick&dirty with NO
error correction whatsoever. I used the unix command cat to
concatenate test1mb.txt a bunch of times to make a 50 mb file.) This
presumes that test50mb.txt is in the current directory, and "Untitled
1" is the name that shows up on the desktop for the destination.
Someone more ambitious than I could package this into a more usable
program.
#!/bin/bash
time cp test50mb.txt /Volumes/Untitled\ 1/test50mb.txt
"Untitled 1" is how my Cruzer 2GB stick shows up on my system right now.
Don't forget to make it executable after writing it:
dbdev2:Desktop johnson$ chmod u+x speed.sh
Then I invoked it:
dbdev2:Desktop johnson$ ./speed.sh
real 0m6.729s
user 0m0.001s
sys 0m0.156s
Here we're only interested in the 'real' value. 50 mb/ 6.729 seconds =
7.43 MB/sec
Voila!
--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group
Institutions do not have opinions, merely customs
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