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maxrps.py
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maxrps.py
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import gevent
from gevent import monkey
monkey.patch_all()
import time, sys, urllib2, operator
from optparse import OptionParser
class Response:
start = None
end = None
latency = None
contentLength = None
error = None
@property
def latency(self):
return self.end - self.start
class Worker():
def __init__(self, master):
self.master = master
self.responses = set()
self.task = None
self.keepGoing = True
def start(self):
self.task = gevent.spawn(self.run)
return self
def report(self):
bytes = success = error = 0
latencies = []
for r in self.responses:
if r.error:
error += 1
else:
success += 1
latencies.append(r.latency)
bytes += r.contentLength
self.responses.clear()
return (success, error, latencies, bytes)
def run(self):
while self.keepGoing:
response = Response()
response.start = time.time()
try:
def performCall():
http = urllib2.urlopen(self.master.url)
return http.read()
bytes = gevent.with_timeout(self.master.maxLatency, performCall)
response.contentLength = len(bytes)
except BaseException, e:
response.error = str(e)
finally:
response.end = time.time()
self.responses.add(response)
def getReport(rps, concurrency, requests, errors, errorRate, median, mbps):
concurrency = str(int(concurrency))
rps = str(int(rps))
errorRate = "(%.1f%%)"%(errorRate*100,)
mbps = "%.2f" % mbps
requests = str(int(requests))
errors = str(int(errors))
median = str(int(median*1000))
return ("RPS:" + rps.rjust(4) + " C:" + concurrency.rjust(3) +" Requests:" + requests.rjust(7) +" Errors:" + errors.rjust(5) + " " + errorRate.rjust(8) + " " + median.rjust(5) + "ms " + mbps.rjust(6) + " mbit/s")
class MaxRps(object):
def __init__(self, url, options):
self.url = url
self.options = options
self.maxErrorRate = options.errorrate / 100.0
self.maxMedianLatency = options.time / 1000.0
self.maxLatency = options.maxtime / 1000.0
self.workers = set()
self.success = self.error = self.bytes = 0
self.latencies = []
def run(self):
ramping = [3, 6, 10, 15, 20, 25, 30, 40, 50, 60, 70, 80, 90, 100, 125, 150, 200, 250]
def ramper():
ramptime = 1
MAXRAMPTIME = 5
lastTime = time.time()
lastRps = 0
hasRpsDrop = False
rampDownStreak = 0
stableStreak = 10000
while True:
try:
gevent.sleep(ramptime)
if ramptime < MAXRAMPTIME:
ramptime += 0.5
rampDown = False
rampUp = 0
concurrency = len(self.workers)
errorRate = self.error / (self.success + self.error) if self.success or self.error else 0.0
currentTime = time.time()
elapsed = currentTime - lastTime
lastTime = currentTime
rps = self.success / elapsed
latencies.extend(self.latencies)
latencies.sort()
if latencies:
median = latencies[len(latencies) // 2]
else:
median = 0.0
megabit = (self.bytes * 8.0) / (1024 * 1024)
report = getReport(rps, concurrency, self.success+self.error, self.error, errorRate, median, megabit/elapsed)
print
print "#" * (len(report) + 4)
print "# " + report + " #"
print "#" * (len(report) + 4)
print
self.success = self.error = self.bytes = 0
self.latencies = []
if concurrency > 1 and errorRate > self.maxErrorRate:
print "Error rate too high, ramping down"
rampDown = True
elif concurrency > 1 and median > self.maxMedianLatency:
print "Median latency too high, ramping down"
rampDown = True
elif rps > lastRps:
if hasRpsDrop:
rampUp = 1
else:
for ramp in ramping:
if ramp > concurrency:
rampUp = ramp - concurrency
break
elif rps < lastRps:
rampUp = 1
hasRpsDrop = True
if rampDown:
rampDownStreak += 1
stableStreak = 0
else:
rampDownStreak = 0
stableStreak += 1
if rampDown and self.workers:
for i in range(rampDownStreak):
if self.workers:
worker = self.workers.pop()
worker.keepGoing = False
if stableStreak > 2:
for i in range(rampUp):
self.workers.add(Worker(self).start())
lastRps = rps
except KeyboardInterrupt:
return
gevent.spawn(ramper)
for i in range(self.options.concurrency):
self.workers.add(Worker(self).start())
INTERVAL = 0.5
while True:
try:
gevent.sleep(INTERVAL)
success = error = 0.0
latencies = []
bytes = 0
for worker in self.workers:
report = worker.report()
(wsuccess, werror, wlatencies, wbytes) = report
success += wsuccess
error += werror
latencies.extend(wlatencies)
bytes += wbytes
latencies.sort()
if latencies:
median = latencies[len(latencies) // 2]
else:
median = 0.0
self.success += success
self.error += error
self.latencies.extend(latencies)
self.bytes += bytes
megabit = (bytes * 8.0) / (1024 * 1024)
concurrency = len(self.workers)
errorRate = error / (success + error) if success or error else 0.0
if not self.options.quiet:
print "> " + getReport(success / INTERVAL, concurrency, success+error, error, errorRate, median, megabit / INTERVAL)
except KeyboardInterrupt:
return
if __name__ == "__main__":
parser = OptionParser(usage="usage: %prog [options] url")
parser.add_option("-t", "--time", action="store", type="int", dest="time", default=250, help="Median latency accepted in milliseconds. Default: 250 ms")
parser.add_option("-m", "--maxtime", action="store", type="int", dest="maxtime", default=1000, help="Maximum latency accepted (anything else will be a failed request) in milliseconds. Default: 1000 ms")
parser.add_option("-e", "--errorrate", action="store", type="int", dest="errorrate", default=5, help="Maximum accepted error rate (in percent) Default: 5")
parser.add_option("-c", "--concurrency", action="store", type="int", dest="concurrency", default=1, help="Number of concurrent requests to start at. Default: 1")
parser.add_option("-q", "--quiet", action="store_true", dest="quiet", help="Do not print status updates in short intervals", default=False)
(options, args) = parser.parse_args()
if len(args) != 1:
parser.print_help()
sys.exit(1)
url = args[0]
print
print "Benchmarking %s" % (url, )
print "Starting at %d concurrent requests" % (options.concurrency, )
print "Accepted median latency of %d ms (maximum accepted %d ms)" % (options.time, options.maxtime)
print
print
maxrps = MaxRps(url, options)
maxrps.run()