Off-Topic

[Dan Stromberg]

On Thu, 2004-09-16 at 06:31, Don {KMTS}.Net Support wrote:
> Hi list,
> I am sorry to ask this off topic question, but I am trying to locate a
> Linux/Unix based program (preferably ftp so there is no caching) to do speed
> tests on.  We are an ISP of 4000 and we have been relying on licensing the
> "speed test" page, but as that uses http we feel the numbers are not correct
> for our customers.  Are there any open source speed test sources that I can
> install on a Linux machine that my customers can go to to check their
> speeds?
> Any help in this matter are much appreciated.

iperf is good.
ftp is good.

I often use the attached program, named reblock.  It can be inserted
into a pipeline based on rsh, ssh, netcat or whatever, and slows down
the pipeline only marginally (especially if you use a large blocksize). 
The -t option is what gives the throughput measure.

-- 
Dan Stromberg DCS/NACS/UCI <strombrg at dcs.nac.uci.edu>

-------------- next part --------------
#!/dcs/bin/python

import select
import sys
import string
import os

def main():
	verbose = 0
	tp = 0
	#sys.stderr.write(sys.argv[1]+'\n')
	if sys.argv[1:] and sys.argv[1] == '-t':
		del sys.argv[1]
		# thruput option
		tp = 1
		import time
		size = 0
		t0 = time.time()
	if sys.argv[1:]:
		blocksize=string.atoi(sys.argv[1])
		timeout=string.atof(sys.argv[2])
	else:
		sys.stderr.write('usage: '+sys.argv[0]+' [-t] blocksize timeout\n')
		sys.stderr.write('-t reports on throughput\n')
		sys.stderr.write('blocksize is in bytes\n')
		sys.stderr.write('timeout is in seconds (floating point)\n')
		sys.exit(0)
	
	bigblock=''
	#sys.stderr.write(str(tp)+'\n')
	while 1:
		retval=select.select([0],[],[],timeout)
		if len(retval[0]) == 0:
			# timeout
			if verbose:
				sys.stderr.write('got timeout\n')
			finish(blocksize,bigblock,tp)
			break
		elif len(retval[0]) == 1 and retval[0][0] == 0:
			# got input
			if verbose:
				sys.stderr.write('select says ready to read\n')
			block = os.read(0,blocksize)
			if not block:
				# eof
				if verbose:
					sys.stderr.write('got eof\n')
				finish(blocksize,bigblock,tp)
				break
			if len(block) < blocksize and verbose:
				sys.stderr.write('got short block\n')
			bigblock=bigblock+block
			if len(bigblock) >= blocksize:
				os.write(1,bigblock[0:blocksize])
				if tp:
					size = size + blocksize
					dt = time.time() - t0
					sys.stderr.write('Kbytes: '+str(int(size/1024))+\
						'\tKbps: '+\
						str(int((size / (dt)) / 1024))+\
						'\tmin: '+str(int(dt/60))+'     \r')
				bigblock=bigblock[blocksize:]
		else:
			sys.stderr.write('Something bizarre happened\n')
			sys.stderr.write(str(retval)+'\n')

def finish(blocksize,block,tp):
	# write what's left, and pad to an integral block size
	if len(block) > blocksize:
		sys.stderr.write('internal error: len(block) > blocksize\n')
		sys.exit(1)
	remainder = blocksize - len(block)
	os.write(1,block+ (chr(0) * remainder))
	if tp:
		sys.stderr.write('\n')
	
main()
sys.exit(0)

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