If you just want to find out what happens under load, try this in sh:
while true;
do wget ftp://mysite.com/file;
done;
What exactly are you trying to benchmark? Download rates, or read/write rates? Your internet connection is almost certainly the bottleneck here, at least if your server hardware is anything remotely modern. If you're trying to benchmark your read/write rates to disk, then doing this test locally (run the program from the same server the FTP daemon is running on) will do the trick too.
If you just want to find out what happens under load, try this in sh:
What exactly are you trying to benchmark? Download rates, or read/write rates? Your internet connection is almost certainly the bottleneck here, at least if your server hardware is anything remotely modern. If you're trying to benchmark your read/write rates to disk, then doing this test locally (run the program from the same server the FTP daemon is running on) will do the trick too.