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cudf-merge.py
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cudf-merge.py
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"""
Benchmark send receive on one machine
"""
import argparse
import asyncio
import cProfile
import io
import pickle
import pstats
import sys
from time import perf_counter as clock
from dask.utils import format_bytes, format_time
import cudf
import cupy
import numpy as np
import rmm
import ucp
from ucp.utils import run_on_local_network
async def send_df(ep, df):
header, frames = df.serialize()
header["frame_ifaces"] = [f.__cuda_array_interface__ for f in frames]
header = pickle.dumps(header)
header_nbytes = np.array([len(header)], dtype=np.uint64)
await ep.send(header_nbytes)
await ep.send(header)
for frame in frames:
await ep.send(frame)
async def recv_df(ep):
header_nbytes = np.empty((1,), dtype=np.uint64)
await ep.recv(header_nbytes)
header = bytearray(header_nbytes[0])
await ep.recv(header)
header = pickle.loads(header)
frames = [
cupy.empty(iface["shape"], dtype=iface["typestr"])
for iface in header["frame_ifaces"]
]
for frame in frames:
await ep.recv(frame)
cudf_typ = pickle.loads(header["type-serialized"])
return cudf_typ.deserialize(header, frames)
async def barrier(rank, eps):
if rank == 0:
await asyncio.gather(*[ep.recv(np.empty(1, dtype="u1")) for ep in eps.values()])
else:
await eps[0].send(np.zeros(1, dtype="u1"))
async def send_bins(eps, bins):
futures = []
for rank, ep in eps.items():
futures.append(send_df(ep, bins[rank]))
await asyncio.gather(*futures)
async def recv_bins(eps, bins):
futures = []
for ep in eps.values():
futures.append(recv_df(ep))
bins.extend(await asyncio.gather(*futures))
async def exchange_and_concat_bins(rank, eps, bins, timings=None):
ret = [bins[rank]]
if timings is not None:
t1 = clock()
await asyncio.gather(recv_bins(eps, ret), send_bins(eps, bins))
if timings is not None:
t2 = clock()
timings.append(
(t2 - t1, sum([sys.getsizeof(b) for i, b in enumerate(bins) if i != rank]))
)
return cudf.concat(ret)
async def distributed_join(args, rank, eps, left_table, right_table, timings=None):
left_bins = left_table.partition_by_hash(["key"], args.n_chunks)
right_bins = right_table.partition_by_hash(["key"], args.n_chunks)
left_df = await exchange_and_concat_bins(rank, eps, left_bins, timings)
right_df = await exchange_and_concat_bins(rank, eps, right_bins, timings)
return left_df.merge(right_df)
def generate_chunk(i_chunk, local_size, num_chunks, chunk_type, frac_match):
cupy.random.seed(42)
if chunk_type == "build":
# Build dataframe
#
# "key" column is a unique sample within [0, local_size * num_chunks)
#
# "shuffle" column is a random selection of partitions (used for shuffle)
#
# "payload" column is a random permutation of the chunk_size
start = local_size * i_chunk
stop = start + local_size
df = cudf.DataFrame(
{
"key": cupy.arange(start, stop=stop, dtype="int64"),
"payload": cupy.arange(local_size, dtype="int64"),
}
)
else:
# Other dataframe
#
# "key" column matches values from the build dataframe
# for a fraction (`frac_match`) of the entries. The matching
# entries are perfectly balanced across each partition of the
# "base" dataframe.
#
# "payload" column is a random permutation of the chunk_size
# Step 1. Choose values that DO match
sub_local_size = local_size // num_chunks
sub_local_size_use = max(int(sub_local_size * frac_match), 1)
arrays = []
for i in range(num_chunks):
bgn = (local_size * i) + (sub_local_size * i_chunk)
end = bgn + sub_local_size
ar = cupy.arange(bgn, stop=end, dtype="int64")
arrays.append(cupy.random.permutation(ar)[:sub_local_size_use])
key_array_match = cupy.concatenate(tuple(arrays), axis=0)
# Step 2. Add values that DON'T match
missing_size = local_size - key_array_match.shape[0]
start = local_size * num_chunks + local_size * i_chunk
stop = start + missing_size
key_array_no_match = cupy.arange(start, stop=stop, dtype="int64")
# Step 3. Combine and create the final dataframe chunk
key_array_combine = cupy.concatenate(
(key_array_match, key_array_no_match), axis=0
)
df = cudf.DataFrame(
{
"key": cupy.random.permutation(key_array_combine),
"payload": cupy.arange(local_size, dtype="int64"),
}
)
return df
async def worker(rank, eps, args):
# Setting current device and make RMM use it
dev_id = args.devs[rank % len(args.devs)]
cupy.cuda.runtime.setDevice(dev_id)
rmm.reinitialize(
pool_allocator=True, devices=dev_id, initial_pool_size=args.rmm_init_pool_size
)
# Make cupy use RMM
cupy.cuda.set_allocator(rmm.rmm_cupy_allocator)
df1 = generate_chunk(rank, args.chunk_size, args.n_chunks, "build", args.frac_match)
df2 = generate_chunk(rank, args.chunk_size, args.n_chunks, "other", args.frac_match)
# Let's warmup and sync before benchmarking
await distributed_join(args, rank, eps, df1, df2)
await barrier(rank, eps)
if args.cuda_profile:
cupy.cuda.profiler.start()
if args.profile:
pr = cProfile.Profile()
pr.enable()
timings = []
t1 = clock()
await distributed_join(args, rank, eps, df1, df2, timings)
await barrier(rank, eps)
took = clock() - t1
if args.profile:
pr.disable()
s = io.StringIO()
ps = pstats.Stats(pr, stream=s)
ps.dump_stats("%s.%0d" % (args.profile, rank))
if args.cuda_profile:
cupy.cuda.profiler.stop()
data_processed = len(df1) * sum([t.itemsize for t in df1.dtypes])
data_processed += len(df2) * sum([t.itemsize for t in df2.dtypes])
return {
"bw": sum(t[1] for t in timings) / sum(t[0] for t in timings),
"wallclock": took,
"throughput": args.n_chunks * data_processed / took,
"data_processed": data_processed,
}
def parse_args():
parser = argparse.ArgumentParser(description="")
parser.add_argument(
"--chunks-per-dev",
metavar="N",
default=1,
type=int,
help="Number of chunks per device",
)
parser.add_argument(
"-d",
"--devs",
metavar="LIST",
default="0",
type=str,
help='GPU devices to use (default "0").',
)
parser.add_argument(
"-s",
"--server-address",
metavar="ip",
default=ucp.get_address(),
type=str,
help="Server address (default `ucp.get_address()`).",
)
parser.add_argument("-c", "--chunk-size", type=int, default=4, metavar="N")
parser.add_argument(
"--frac-match",
metavar="FRAC",
default=0.3,
type=float,
help="Fraction of rows that matches (default 0.3)",
)
parser.add_argument(
"--net-devices",
metavar="LIST",
default=None,
type=str,
help='List of net devices to use, one for each device or "auto"',
)
parser.add_argument(
"--profile",
metavar="FILENAME",
default=None,
type=str,
help="Write profile for each worker to `filename.RANK`",
)
parser.add_argument(
"--cuda-profile",
default=False,
action="store_true",
help="Enable CUDA profiling, use with `nvprof --profile-child-processes \
--profile-from-start off`",
)
parser.add_argument(
"--rmm-init-pool-size",
metavar="BYTES",
default=None,
type=int,
help="Initial RMM pool size (default 1/2 total GPU memory)",
)
args = parser.parse_args()
args.devs = [int(d) for d in args.devs.split(",")]
args.n_chunks = len(args.devs) * args.chunks_per_dev
if args.n_chunks < 2:
raise RuntimeError(
f"Number of chunks must be greater than 1 (chunks-per-dev: \
{args.chunks_per_dev}, devs: {args.devs})"
)
if args.net_devices == "auto":
args.net_devices = [ucp.utils.get_closest_net_devices(d) for d in args.devs]
elif args.net_devices is not None:
args.net_devices = args.net_devices.split(",")
assert len(args.net_devices) == len(args.devs)
return args
def main():
args = parse_args()
ranks = range(args.n_chunks)
assert len(ranks) > 1
assert len(ranks) % 2 == 0
ucx_options_list = None
if args.net_devices is not None:
ucx_options_list = [
{"NET_DEVICES": args.net_devices[rank % len(args.devs)]} for rank in ranks
]
stats = run_on_local_network(
args.n_chunks,
worker,
worker_args=args,
server_address=args.server_address,
ucx_options_list=ucx_options_list,
)
wc = stats[0]["wallclock"]
bw = sum(s["bw"] for s in stats) / len(stats)
tp = stats[0]["throughput"]
dp = sum(s["data_processed"] for s in stats)
print("cudf merge benchmark")
print("----------------------------")
print(f"device(s) | {args.devs}")
print(f"chunks-per-dev | {args.chunks_per_dev}")
print(f"rows-per-chunk | {args.chunk_size}")
print(f"data-processed | {format_bytes(dp)}")
print(f"frac-match | {args.frac_match}")
print("============================")
print(f"Wall-clock | {format_time(wc)}")
print(f"Bandwidth | {format_bytes(bw)}/s")
print(f"Throughput | {format_bytes(tp)}/s")
if __name__ == "__main__":
main()