xiaoy@bullet.ecf (XIAO Yan) (06/24/91)
A user in our system uploads files regularly from his Mac to a 4D/320. His files are of about 500k. He uses kermit at 19200 baud link. However, he can only get 900CPS (character per second), which is only about 40% of the line speed. We also tried 38000 baud (changing the source code of kermit a little bit...), but the resulting transmit speed did not change. Mac actually showed the efficiency of transmitting. Does anybody know a faster way? xiao
blythe@sgi.com (David Blythe) (06/25/91)
In article <1991Jun24.145331.12031@ecf.toronto.edu> xiaoy@bullet.ecf (XIAO Yan) writes: >A user in our system uploads files regularly from his Mac to a >4D/320. His files are of about 500k. He uses kermit at 19200 baud >link. However, he can only get 900CPS (character per second), >which is only about 40% of the line speed. We also tried 38000 >baud (changing the source code of kermit a little bit...), but the >resulting transmit speed did not change. Mac actually showed the >efficiency of transmitting. > >Does anybody know a faster way? > I think zmodem uses a denser encoding and is generally faster. I know that there are versions available for UNIX systems, but I don't know where you would get a Mac version. db
marks@AIVAX.RADC.AF.MIL (David Marks) (06/25/91)
Yes. Use zmodem - the fastest serial transfer method I have ever seen. On a 9600BPS connection, I get > 940 CPS always! I got it up and running with no problems, but I don't remember which site I grabbed it from. My ftp-list file shows it at ames.arc.nasa.gov and trix.ai.mit.edu. On the mac side, get the zmodem program, available at sumex-aim.stanford.edu:info-mac/comm, or any mac repository. Its so easy you will shout with glee when you see it work. The Mac zmodem program watches for a command sequence from the remote host which sends it into receive mode automatically. So lets say you have a directory full of files you want to send to the mac from your sgi; just cd to wherever and type sz * - and thats it! You even get an realtime analysis of the throughput achieved. Pardon me if I sound excited, but after 5 years of getting 340 CPS on a 9600BPS connection with kermit, I feel justified. Anyway, if you don't want to browse for the source, I can send you a working copy of what we've got. I'm running IRIX 3.3.2 on a 340VGX. Dave Marks Rome Laboratory marks@aivax.radc.af.mil