def test_ramused(self):
v1 = memory.total_ram() - memory.free_ram()
v2 = memory.used_ram()
self.assertApproximates(v1, v2, 5)
def fake_render():
process = psutil.Process()
memory_used_at_start = memory.used_ram()
logger.info("sys.argv: %r", sys.argv)
# build parser
parser = argparse.ArgumentParser(
description="Very basic command line tool which vaguely simulates a "
"render.")
parser.add_argument(
"--ram", type=int, default=25,
help="How much ram in megabytes the fake command should consume")
parser.add_argument(
"--duration", type=int, default=5,
help="How many seconds it should take to run this command")
parser.add_argument(
"--return-code", type=int, action="append", default=[0],
help="The return code to return, declaring this flag multiple times "
"will result in a random return code. [default: %(default)s]")
parser.add_argument(
"--duration-jitter", type=int, default=5,
help="Randomly add or subtract this amount to the total duration")
parser.add_argument(
"--ram-jitter", type=int, default=None,
help="Randomly add or subtract this amount to the ram")
parser.add_argument(
"-s", "--start", type=int, required=True,
help="The start frame. If no other flags are provided this will also "
"be the end frame.")
parser.add_argument(
"-e", "--end", type=int, help="The end frame")
parser.add_argument(
"-b", "--by", type=int, help="The by frame", default=1)
parser.add_argument(
"--spew", default=False, action="store_true",
help="Spews lots of random output to stdout which is generally "
"a decent stress test for log processing issues. Do note however "
"that this will disable the code which is consuming extra CPU "
"cycles. Also, use this option with care as it can generate "
"several gigabytes of data per frame.")
parser.add_argument(
"--segfault", action="store_true",
help="If provided then there's a 25%% chance of causing a segmentation "
"fault.")
args = parser.parse_args()
if args.end is None:
args.end = args.start
if args.ram_jitter is None:
args.ram_jitter = int(args.ram / 2)
assert args.end >= args.start and args.by >= 1
random_output = None
if args.spew:
random_output = list(os.urandom(1024).encode("hex") for _ in xrange(15))
errors = 0
if isinstance(args.start, float):
logger.warning(
"Truncating `start` to an integer (float not yet supported)")
args.start = int(args.start)
if isinstance(args.end, float):
logger.warning(
"Truncating `end` to an integer (float not yet supported)")
args.end = int(args.end)
if isinstance(args.by, float):
logger.warning(
"Truncating `by` to an integer (float not yet supported)")
args.by = int(args.by)
for frame in xrange(args.start, args.end + 1, args.by):
duration = args.duration + randint(
-args.duration_jitter, args.duration_jitter)
ram_usage = max(
0, args.ram + randint(-args.ram_jitter, args.ram_jitter))
logger.info("Starting frame %04d", frame)
# Warn if we're already using more memory
if ram_usage < memory_used_at_start:
logger.warning(
"Memory usage starting up is higher than the value provided, "
"defaulting --ram to %s", memory_used_at_start)
# Consume the requested memory (or close to)
# TODO: this is unrealistic, majority of renders don't eat ram like this
memory_to_consume = int(ram_usage - memory.used_ram())
big_string = " " * 1048576 # ~ 1MB of memory usage
if memory_to_consume > 0:
start = time.time()
logger.debug(
"Consuming %s megabytes of memory", memory_to_consume)
try:
big_string += big_string * memory_to_consume
except MemoryError:
logger.error("Cannot render, not enough memory")
errors += 1
continue
logger.debug(
"Finished consumption of memory in %s seconds. Off from "
"target memory usage by %sMB.",
time.time() - start, memory.used_ram() - ram_usage)
# Decently guaranteed to cause a segmentation fault. Originally from:
# https://wiki.python.org/moin/CrashingPython#ctypes
if args.segfault and random() > .25:
i = ctypes.c_char('a')
j = ctypes.pointer(i)
c = 0
while True:
j[c] = 'a'
c += 1
j
# Continually hash a part of big_string to consume
# cpu cycles
end_time = time.time() + duration
last_percent = None
while time.time() < end_time:
if args.spew:
print >> sys.stdout, choice(random_output)
else:
hashlib.sha1(big_string[:4096]) # consume CPU cycles
progress = (1 - (end_time - time.time()) / duration) * 100
percent, _ = divmod(progress, 5)
if percent != last_percent:
last_percent = percent
logger.info("Progress %03d%%", progress)
if last_percent is None:
logger.info("Progress 100%%")
logger.info("Finished frame %04d in %s seconds", frame, duration)
if errors:
logger.error("Render finished with errors")
sys.exit(1)
else:
return_code = choice(args.return_code)
logger.info("exit %s", return_code)
