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ruby: Detect garnet network-level deadlock.

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This patch detects garnet network deadlock by monitoring
network interfaces. If a network interface continuously
fails to allocate virtual channels for a message, a
possible deadlock is detected.
This commit is contained in:
Jieming Yin 2016-12-15 16:59:17 -05:00
parent cc1f5a4d16
commit b9c7b8190c
4 changed files with 21 additions and 1 deletions
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4
configs/network/Network.py
View file

@ -70,6 +70,9 @@ def define_options(parser):
default=False,
help="""enable network fault model:
see src/mem/ruby/network/fault_model/""")
parser.add_option("--garnet-deadlock-threshold", action="store",
type="int", default=50000,
help="network-level deadlock threshold.")
def create_network(options, ruby):
@ -103,6 +106,7 @@ def init_network(options, network, InterfaceClass):
network.vcs_per_vnet = options.vcs_per_vnet
network.ni_flit_size = options.link_width_bits / 8
network.routing_algorithm = options.routing_algorithm
network.garnet_deadlock_threshold = options.garnet_deadlock_threshold
if options.network == "simple":
network.setup_buffers()

4
src/mem/ruby/network/garnet2.0/GarnetNetwork.py
View file

@ -46,6 +46,8 @@ class GarnetNetwork(RubyNetwork):
"0: Weight-based Table, 1: XY, 2: Custom");
enable_fault_model = Param.Bool(False, "enable network fault model");
fault_model = Param.FaultModel(NULL, "network fault model");
garnet_deadlock_threshold = Param.UInt32(50000,
"network-level deadlock threshold")
class GarnetNetworkInterface(ClockedObject):
type = 'GarnetNetworkInterface'
@ -57,6 +59,8 @@ class GarnetNetworkInterface(ClockedObject):
"virtual channels per virtual network")
virt_nets = Param.UInt32(Parent.number_of_virtual_networks,
"number of virtual networks")
garnet_deadlock_threshold = Param.UInt32(Parent.garnet_deadlock_threshold,
"network-level deadlock threshold")
class GarnetRouter(BasicRouter):
type = 'GarnetRouter'

11
src/mem/ruby/network/garnet2.0/NetworkInterface.cc
View file

@ -50,7 +50,9 @@ using m5::stl_helpers::deletePointers;
NetworkInterface::NetworkInterface(const Params *p)
: ClockedObject(p), Consumer(this), m_id(p->id),
m_virtual_networks(p->virt_nets), m_vc_per_vnet(p->vcs_per_vnet),
m_num_vcs(m_vc_per_vnet * m_virtual_networks)
m_num_vcs(m_vc_per_vnet * m_virtual_networks),
m_deadlock_threshold(p->garnet_deadlock_threshold),
vc_busy_counter(m_virtual_networks, 0)
{
m_router_id = -1;
m_vc_round_robin = 0;
@ -314,9 +316,16 @@ NetworkInterface::calculateVC(int vnet)
if (m_out_vc_state[(vnet*m_vc_per_vnet) + delta]->isInState(
IDLE_, curCycle())) {
vc_busy_counter[vnet] = 0;
return ((vnet*m_vc_per_vnet) + delta);
}
}
vc_busy_counter[vnet] += 1;
panic_if(vc_busy_counter[vnet] > m_deadlock_threshold,
"%s: Possible network deadlock in vnet: %d at time: %llu \n",
name(), vnet, curTick());
return -1;
}

3
src/mem/ruby/network/garnet2.0/NetworkInterface.hh
View file

@ -83,6 +83,7 @@ class NetworkInterface : public ClockedObject, public Consumer
int m_vc_round_robin; // For round robin scheduling
flitBuffer *outFlitQueue; // For modeling link contention
flitBuffer *outCreditQueue;
int m_deadlock_threshold;
NetworkLink *inNetLink;
NetworkLink *outNetLink;
@ -98,6 +99,8 @@ class NetworkInterface : public ClockedObject, public Consumer
std::vector<MessageBuffer *> inNode_ptr;
// The Message buffers that provides messages to the protocol
std::vector<MessageBuffer *> outNode_ptr;
// When a vc stays busy for a long time, it indicates a deadlock
std::vector<int> vc_busy_counter;
bool flitisizeMessage(MsgPtr msg_ptr, int vnet);
int calculateVC(int vnet);