Dear All,
I like to simulate the synthetic traffic analysis for Torus for 256 nodes
with uniform traffic.
However, the network is showing latency degradation after 0.14 injection
rate (flit latency = 33.044985 for 0.14 and flit latency = 38.244770 for
0.13 ), which could be the possible case of network deadlocked.
I configured the garnet 2.0 with all the default settings (4 vc + 16
bandwith factor) and Mesh network is also performing properly. As the
number of VC is 4, Torus should not be in a deadlock.
I also like to share the network file as attachment.
And please consider the simulation condition as below-
./build/Garnet_standalone/gem5.debug configs.py/example/garnet_synth_traffic
--num-cpus=256 --num-dirs=256 --network=garnet2.0 --topology=Torus_XY
--mesh-rows=16 --sim-cycles=20000 --synthetic=uniform_random
--injectionrate=0.14
--routing-algorithm=0 --vcs-per-vnet=4
Please let me know how to resolve this issue for Garnet 2.0.
Thanks and best regards,
F.A. Faisal
# Copyright (c) 2010 Advanced Micro Devices, Inc.
# 2016 Georgia Institute of Technology
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# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution;
# neither the name of the copyright holders nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
# Authors: Brad Beckmann
# Tushar Krishna
from m5.params import *
from m5.objects import *
from BaseTopology import SimpleTopology
# Creates a generic Mesh assuming an equal number of cache
# and directory controllers.
# XY routing is enforced (using link weights)
# to guarantee deadlock freedom.
class Torus_XY(SimpleTopology):
description='Torus_XY'
def __init__(self, controllers):
self.nodes = controllers
# Makes a generic mesh
# assuming an equal number of cache and directory cntrls
def makeTopology(self, options, network, IntLink, ExtLink, Router):
nodes = self.nodes
num_routers = options.num_cpus
num_rows = options.mesh_rows
# default values for link latency and router latency.
# Can be over-ridden on a per link/router basis
link_latency = options.link_latency # used by simple and garnet
router_latency = options.router_latency # only used by garnet
# There must be an evenly divisible number of cntrls to routers
# Also, obviously the number or rows must be <= the number of routers
cntrls_per_router, remainder = divmod(len(nodes), num_routers)
assert(num_rows > 0 and num_rows <= num_routers)
num_columns = int(num_routers / num_rows)
assert(num_columns * num_rows == num_routers)
# Create the routers in the torus
routers = [Router(router_id=i, latency = router_latency) \
for i in range(num_routers)]
network.routers = routers
# link counter to set unique link ids
link_count = 0
# Add all but the remainder nodes to the list of nodes to be uniformly
# distributed across the network.
network_nodes = []
remainder_nodes = []
for node_index in xrange(len(nodes)):
if node_index < (len(nodes) - remainder):
network_nodes.append(nodes[node_index])
else:
remainder_nodes.append(nodes[node_index])
# Connect each node to the appropriate router
ext_links = []
for (i, n) in enumerate(network_nodes):
cntrl_level, router_id = divmod(i, num_routers)
assert(cntrl_level < cntrls_per_router)
ext_links.append(ExtLink(link_id=link_count, ext_node=n,
int_node=routers[router_id],
latency = link_latency))
link_count += 1
# Connect the remainding nodes to router 0. These should only be
# DMA nodes.
for (i, node) in enumerate(remainder_nodes):
assert(node.type == 'DMA_Controller')
assert(i < remainder)
ext_links.append(ExtLink(link_id=link_count, ext_node=node,
int_node=routers[0],
latency = link_latency))
link_count += 1
network.ext_links = ext_links
# Create the mesh links.
int_links = []
# East output to West input links (weight = 1)
for row in xrange(num_rows):
for col in xrange(num_columns):
east_out = col + (row * num_columns)
if (col + 1 < num_columns):
west_in = (col + 1) + (row * num_columns)
else:
west_in = (row * num_columns)
int_links.append(IntLink(link_id=link_count,
src_node=routers[east_out],
dst_node=routers[west_in],
src_outport="East",
dst_inport="West",
latency=link_latency,
weight=1))
link_count += 1
print "[east_out= ",east_out, " west_in= ", west_in, "] ", num_rows, num_columns
# West output to East input links (weight = 1)
for row in xrange(num_rows):
for col in xrange(num_columns):
east_in = col + (row * num_columns)
if (col + 1 < num_columns):
west_out = (col + 1) + (row * num_columns)
else:
west_out = (row * num_columns)
int_links.append(IntLink(link_id=link_count,
src_node=routers[west_out],
dst_node=routers[east_in],
src_outport="West",
dst_inport="East",
latency=link_latency,
weight=1))
link_count += 1
print "[east_in= ",east_in, " west_out= ", west_out, "] "
# North output to South input links (weight = 2)
for col in xrange(num_columns):
for row in xrange(num_rows):
north_out = col + (row * num_columns)
if (row + 1 < num_rows):
south_in = col + ((row + 1) * num_columns)
else:
south_in = col
int_links.append(IntLink(link_id=link_count,
src_node=routers[north_out],
dst_node=routers[south_in],
src_outport="North",
dst_inport="South",
latency = link_latency,
weight=2))
link_count +=1
print "[north_out= ",north_out, " south_in= ", south_in, "] "
# South output to North input links (weight = 2)
for col in xrange(num_columns):
for row in xrange(num_rows):
north_in = col + (row * num_columns)
if (row + 1 < num_rows):
south_out = col + ((row + 1) * num_columns)
else:
south_out = col
int_links.append(IntLink(link_id=link_count,
src_node=routers[south_out],
dst_node=routers[north_in],
src_outport="South",
dst_inport="North",
latency = link_latency,
weight=2))
link_count +=1
print "[north_in= ",north_in, " south_out= ", south_out, "] "
network.int_links = int_links
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