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https://github.com/tahoe-lafs/tahoe-lafs.git
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270 lines
8.4 KiB
Python
270 lines
8.4 KiB
Python
#! /usr/bin/python
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"""
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this is a load-generating client program. It does all of its work through a
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given tahoe node (specified by URL), and performs random reads and writes
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to the target.
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Run this in a directory with the following files:
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server-URLs : a list of tahoe node URLs (one per line). Each operation
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will use a randomly-selected server.
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root.cap: (string) the top-level directory rwcap to use
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delay: (float) seconds to delay between operations
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operation-mix: "R/W": two ints, relative frequency of read and write ops
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#size:?
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Set argv[1] to a per-client stats-NN.out file. This will will be updated with
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running totals of bytes-per-second and operations-per-second. The stats from
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multiple clients can be totalled together and averaged over time to compute
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the traffic being accepted by the grid.
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Each time a 'read' operation is performed, the client will begin at the root
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and randomly choose a child. If the child is a directory, the client will
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recurse. If the child is a file, the client will read the contents of the
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file.
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Each time a 'write' operation is performed, the client will generate a target
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filename (a random string). 90% of the time, the file will be written into
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the same directory that was used last time (starting at the root). 10% of the
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time, a new directory is created by assembling 1 to 5 pathnames chosen at
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random. The client then writes a certain number of zero bytes to this file.
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The filesize is determined with something like a power-law distribution, with
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a mean of 10kB and a max of 100MB, so filesize=min(int(1.0/random(.0002)),1e8)
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"""
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import os, sys, httplib, binascii
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import urllib, simplejson, random, time, urlparse
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if sys.argv[1] == "--stats":
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statsfiles = sys.argv[2:]
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# gather stats every 10 seconds, do a moving-window average of the last
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# 60 seconds
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DELAY = 10
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MAXSAMPLES = 6
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totals = []
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last_stats = {}
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while True:
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stats = {}
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for sf in statsfiles:
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for line in open(sf, "r").readlines():
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name, value = line.split(":")
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value = int(value.strip())
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if name not in stats:
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stats[name] = 0
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stats[name] += float(value)
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if last_stats:
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delta = dict( [ (name,stats[name]-last_stats[name])
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for name in stats ] )
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print "THIS SAMPLE:"
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for name in sorted(delta.keys()):
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avg = float(delta[name]) / float(DELAY)
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print "%20s: %0.2f per second" % (name, avg)
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totals.append(delta)
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while len(totals) > MAXSAMPLES:
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totals.pop(0)
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# now compute average
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print
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print "MOVING WINDOW AVERAGE:"
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for name in sorted(delta.keys()):
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avg = sum([ s[name] for s in totals]) / (DELAY*len(totals))
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print "%20s %0.2f per second" % (name, avg)
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last_stats = stats
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print
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print
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time.sleep(DELAY)
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stats_out = sys.argv[1]
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server_urls = []
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for url in open("server-URLs", "r").readlines():
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url = url.strip()
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if url:
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server_urls.append(url)
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root = open("root.cap", "r").read().strip()
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delay = float(open("delay", "r").read().strip())
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readfreq, writefreq = (
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[int(x) for x in open("operation-mix", "r").read().strip().split("/")])
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files_uploaded = 0
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files_downloaded = 0
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bytes_uploaded = 0
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bytes_downloaded = 0
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directories_read = 0
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directories_written = 0
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def listdir(nodeurl, root, vdrive_pathname):
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if nodeurl[-1] != "/":
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nodeurl += "/"
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url = nodeurl + "uri/%s/" % urllib.quote(root)
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if vdrive_pathname:
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url += urllib.quote(vdrive_pathname)
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url += "?t=json"
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data = urllib.urlopen(url).read()
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try:
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parsed = simplejson.loads(data)
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except ValueError:
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print "URL was", url
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print "DATA was", data
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raise
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nodetype, d = parsed
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assert nodetype == "dirnode"
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global directories_read
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directories_read += 1
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return d['children']
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def choose_random_descendant(server_url, root, pathname=""):
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children = listdir(server_url, root, pathname)
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name = random.choice(children.keys())
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child = children[name]
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if pathname:
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new_pathname = pathname + "/" + name
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else:
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new_pathname = name
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if child[0] == "filenode":
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return new_pathname
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return choose_random_descendant(server_url, root, new_pathname)
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def read_and_discard(nodeurl, root, pathname):
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if nodeurl[-1] != "/":
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nodeurl += "/"
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url = nodeurl + "uri/%s/" % urllib.quote(root)
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if pathname:
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url += urllib.quote(pathname)
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f = urllib.urlopen(url)
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global bytes_downloaded
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while True:
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data = f.read(4096)
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if not data:
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break
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bytes_downloaded += len(data)
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directories = [
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"dreamland/disengaging/hucksters",
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"dreamland/disengaging/klondikes",
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"dreamland/disengaging/neatly",
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"dreamland/cottages/richmond",
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"dreamland/cottages/perhaps",
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"dreamland/cottages/spies",
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"dreamland/finder/diversion",
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"dreamland/finder/cigarette",
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"dreamland/finder/album",
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"hazing/licences/comedian",
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"hazing/licences/goat",
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"hazing/licences/shopkeeper",
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"hazing/regiment/frigate",
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"hazing/regiment/quackery",
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"hazing/regiment/centerpiece",
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"hazing/disassociate/mob",
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"hazing/disassociate/nihilistic",
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"hazing/disassociate/bilbo",
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]
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def create_random_directory():
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d = random.choice(directories)
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pieces = d.split("/")
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numsegs = random.randint(1, len(pieces))
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return "/".join(pieces[0:numsegs])
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def generate_filename():
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fn = binascii.hexlify(os.urandom(4))
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return fn
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def choose_size():
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mean = 10e3
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size = random.expovariate(1.0 / mean)
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return int(min(size, 100e6))
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# copied from twisted/web/client.py
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def parse_url(url, defaultPort=None):
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url = url.strip()
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parsed = urlparse.urlparse(url)
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scheme = parsed[0]
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path = urlparse.urlunparse(('','')+parsed[2:])
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if defaultPort is None:
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if scheme == 'https':
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defaultPort = 443
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else:
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defaultPort = 80
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host, port = parsed[1], defaultPort
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if ':' in host:
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host, port = host.split(':')
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port = int(port)
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if path == "":
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path = "/"
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return scheme, host, port, path
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def generate_and_put(nodeurl, root, vdrive_fname, size):
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if nodeurl[-1] != "/":
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nodeurl += "/"
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url = nodeurl + "uri/%s/" % urllib.quote(root)
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url += urllib.quote(vdrive_fname)
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scheme, host, port, path = parse_url(url)
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if scheme == "http":
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c = httplib.HTTPConnection(host, port)
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elif scheme == "https":
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c = httplib.HTTPSConnection(host, port)
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else:
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raise ValueError("unknown scheme '%s', need http or https" % scheme)
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c.putrequest("PUT", path)
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c.putheader("Hostname", host)
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c.putheader("User-Agent", "tahoe-check-load")
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c.putheader("Connection", "close")
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c.putheader("Content-Length", "%d" % size)
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c.endheaders()
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global bytes_uploaded
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while size:
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chunksize = min(size, 4096)
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size -= chunksize
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c.send("\x00" * chunksize)
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bytes_uploaded += chunksize
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return c.getresponse()
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current_writedir = ""
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while True:
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time.sleep(delay)
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if random.uniform(0, readfreq+writefreq) < readfreq:
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op = "read"
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else:
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op = "write"
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print "OP:", op
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server = random.choice(server_urls)
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if op == "read":
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pathname = choose_random_descendant(server, root)
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print " reading", pathname
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read_and_discard(server, root, pathname)
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files_downloaded += 1
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elif op == "write":
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if random.uniform(0, 100) < 10:
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current_writedir = create_random_directory()
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filename = generate_filename()
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if current_writedir:
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pathname = current_writedir + "/" + filename
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else:
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pathname = filename
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print " writing", pathname
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size = choose_size()
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print " size", size
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generate_and_put(server, root, pathname, size)
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files_uploaded += 1
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f = open(stats_out+".tmp", "w")
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f.write("files-uploaded: %d\n" % files_uploaded)
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f.write("files-downloaded: %d\n" % files_downloaded)
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f.write("bytes-uploaded: %d\n" % bytes_uploaded)
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f.write("bytes-downloaded: %d\n" % bytes_downloaded)
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f.write("directories-read: %d\n" % directories_read)
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f.write("directories-written: %d\n" % directories_written)
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f.close()
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os.rename(stats_out+".tmp", stats_out)
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