[KVStore] Made kvstore can support multiple NICs (#1150)

* API change of kvstore

* add demo for kvstore

* update

* remove duplicated log

* change queue size

* update

* update

* update

* update

* update

* update

* update

* update

* update

* fix lint

* change name

* update

* fix lint

* update

* update

* update

* update

* change message queue size to a python argument

* change default queue size to 2GB

* OMP_NUM_THREADS=1

* add multiple NICs support for kvstore

* test

* fix lint

* update

* update

* update

* update

* update

* update

* update

* fix lint

* fix lint

* update

* update

* update

* update

examples/mxnet/dis_kvstore/client.py

@@ -2,6 +2,7 @@
 import dgl
 import argparse
 import mxnet as mx
+import time
 
 ID = []
 ID.append(mx.nd.array([0,1], dtype='int64'))
@@ -9,17 +10,34 @@ ID.append(mx.nd.array([2,3], dtype='int64'))
 ID.append(mx.nd.array([4,5], dtype='int64'))
 ID.append(mx.nd.array([6,7], dtype='int64'))
 
+DATA = []
+DATA.append(mx.nd.array([[1.,1.,1.,],[1.,1.,1.,]]))
+DATA.append(mx.nd.array([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(mx.nd.array([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(mx.nd.array([[4.,4.,4.,],[4.,4.,4.,]]))
+
 edata_partition_book = {'edata':mx.nd.array([0,0,1,1,2,2,3,3], dtype='int64')}
 ndata_partition_book = {'ndata':mx.nd.array([0,0,1,1,2,2,3,3], dtype='int64')}
 
 def start_client():
-    
+    time.sleep(3)
+
     client = dgl.contrib.start_client(ip_config='ip_config.txt', 
                                       ndata_partition_book=ndata_partition_book, 
                                       edata_partition_book=edata_partition_book)
 
-    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=mx.nd.array([[1.,1.,1.],[1.,1.,1.]]))
-    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=mx.nd.array([[2.,2.,2.],[2.,2.,2.]]))
+
+    tensor_edata = client.pull(name='edata', id_tensor=mx.nd.array([0,1,2,3,4,5,6,7], dtype='int64'))
+    tensor_ndata = client.pull(name='ndata', id_tensor=mx.nd.array([0,1,2,3,4,5,6,7], dtype='int64'))
+
+    print(tensor_edata)
+    client.barrier()
+
+    print(tensor_ndata)
+    client.barrier()
+
+    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
+    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
 
     client.barrier()
 
@@ -27,11 +45,9 @@ def start_client():
     tensor_ndata = client.pull(name='ndata', id_tensor=mx.nd.array([0,1,2,3,4,5,6,7], dtype='int64'))
 
     print(tensor_edata)
-
     client.barrier()
 
     print(tensor_ndata)
-
     client.barrier()
 
     if client.get_id() == 0:

examples/mxnet/dis_kvstore/server.py

@@ -16,14 +16,20 @@ edata_g2l.append({'edata':mx.nd.array([0,0,0,1,0,0,0,0], dtype='int64')})
 edata_g2l.append({'edata':mx.nd.array([0,0,0,0,0,1,0,0], dtype='int64')})
 edata_g2l.append({'edata':mx.nd.array([0,0,0,0,0,0,0,1], dtype='int64')})
 
+DATA = []
+DATA.append(mx.nd.array([[4.,4.,4.,],[4.,4.,4.,]]))
+DATA.append(mx.nd.array([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(mx.nd.array([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(mx.nd.array([[1.,1.,1.,],[1.,1.,1.,]]))
+
 def start_server(args):
     
     dgl.contrib.start_server(
         server_id=args.id,
         ip_config='ip_config.txt',
         num_client=4,
-        ndata={'ndata':mx.nd.array([[0.,0.,0.],[0.,0.,0.]])},
-        edata={'edata':mx.nd.array([[0.,0.,0.],[0.,0.,0.]])},
+        ndata={'ndata':DATA[args.id]},
+        edata={'edata':DATA[args.id]},
         ndata_g2l=ndata_g2l[args.id],
         edata_g2l=edata_g2l[args.id])
 

examples/pytorch/dis_kvstore/client.py

@@ -10,6 +10,12 @@ ID.append(th.tensor([2,3]))
 ID.append(th.tensor([4,5]))
 ID.append(th.tensor([6,7]))
 
+DATA = []
+DATA.append(th.tensor([[1.,1.,1.,],[1.,1.,1.,]]))
+DATA.append(th.tensor([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(th.tensor([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(th.tensor([[4.,4.,4.,],[4.,4.,4.,]]))
+
 edata_partition_book = {'edata':th.tensor([0,0,1,1,2,2,3,3])}
 ndata_partition_book = {'ndata':th.tensor([0,0,1,1,2,2,3,3])}
 
@@ -20,8 +26,18 @@ def start_client():
                                       ndata_partition_book=ndata_partition_book, 
                                       edata_partition_book=edata_partition_book)
 
-    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=th.tensor([[1.,1.,1.],[1.,1.,1.]]))
-    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=th.tensor([[2.,2.,2.],[2.,2.,2.]]))
+
+    tensor_edata = client.pull(name='edata', id_tensor=th.tensor([0,1,2,3,4,5,6,7]))
+    tensor_ndata = client.pull(name='ndata', id_tensor=th.tensor([0,1,2,3,4,5,6,7]))
+
+    print(tensor_edata)
+    client.barrier()
+
+    print(tensor_ndata)
+    client.barrier()
+
+    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
+    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
 
     client.barrier()
 
@@ -29,11 +45,9 @@ def start_client():
     tensor_ndata = client.pull(name='ndata', id_tensor=th.tensor([0,1,2,3,4,5,6,7]))
 
     print(tensor_edata)
-
     client.barrier()
 
     print(tensor_ndata)
-
     client.barrier()
 
     if client.get_id() == 0:

examples/pytorch/dis_kvstore/ip_config.txt

-0 127.0.0.1 40050
-1 127.0.0.1 40051
-2 127.0.0.1 40052
-3 127.0.0.1 40053
+0 127.0.0.1 50050
+1 127.0.0.1 50051
+2 127.0.0.1 50052
+3 127.0.0.1 50053
\ No newline at end of file

examples/pytorch/dis_kvstore/server.py

@@ -16,14 +16,20 @@ edata_g2l.append({'edata':th.tensor([0,0,0,1,0,0,0,0])})
 edata_g2l.append({'edata':th.tensor([0,0,0,0,0,1,0,0])})
 edata_g2l.append({'edata':th.tensor([0,0,0,0,0,0,0,1])})
 
+DATA = []
+DATA.append(th.tensor([[4.,4.,4.,],[4.,4.,4.,]]))
+DATA.append(th.tensor([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(th.tensor([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(th.tensor([[1.,1.,1.,],[1.,1.,1.,]]))
+
 def start_server(args):
     
     dgl.contrib.start_server(
         server_id=args.id,
         ip_config='ip_config.txt',
         num_client=4,
-        ndata={'ndata':th.tensor([[0.,0.,0.],[0.,0.,0.]])},
-        edata={'edata':th.tensor([[0.,0.,0.],[0.,0.,0.]])},
+        ndata={'ndata':DATA[args.id]},
+        edata={'edata':DATA[args.id]},
         ndata_g2l=ndata_g2l[args.id],
         edata_g2l=edata_g2l[args.id])
 

python/dgl/contrib/dis_kvstore.py

@@ -6,11 +6,15 @@ from ..network import _receiver_wait, _sender_connect
 from ..network import _send_kv_msg, _recv_kv_msg
 from ..network import KVMsgType, KVStoreMsg
 
+from .. import backend as F
 from .._ffi.ndarray import empty_shared_mem
 
+import os
 import numpy as np
-import dgl.backend as F
 import socket
+if os.name != 'nt':
+    import fcntl
+    import struct
 
 def read_ip_config(filename):
     """Read networking configuration from file.
@@ -551,7 +555,7 @@ class KVClient(object):
         # find local server nodes
         for ID, addr in self._server_namebook.items():
             server_ip, server_port = addr.split(':')
-            if client_ip == server_ip or server_ip == '127.0.0.1':
+            if server_ip in self._ip4_addr_list():
                 self._local_server_id.add(ID)
 
         # send addr to server nodes
@@ -583,8 +587,8 @@ class KVClient(object):
                 for server_id in self._local_server_id:
                     shared_data = empty_shared_mem(tensor_name+str(server_id), False, shape, dtype)
                     dlpack = shared_data.to_dlpack()
-                    self._data_store[tensor_name] = F.zerocopy_from_dlpack(dlpack)
-                    self._has_data.add(tensor_name)
+                    self._data_store[tensor_name+str(server_id)] = F.zerocopy_from_dlpack(dlpack)
+                    self._has_data.add(tensor_name+str(server_id))
 
 
     def push(self, name, id_tensor, data_tensor):
@@ -622,11 +626,11 @@ class KVClient(object):
             partial_data = data_tensor[start:end]
 
             if server[idx] in self._local_server_id and self._close_shared_mem == False:
-                if (name+'-g2l-' in self._has_data) == True:
-                    local_id = self._data_store[name+'-g2l-'][partial_id]
+                if (name+'-g2l-'+str(server[idx]) in self._has_data) == True:
+                    local_id = self._data_store[name+'-g2l-'+str(server[idx])][partial_id]
                 else:
                     local_id = partial_id
-                self._push_handler(name+'-data-', local_id, data_tensor, self._data_store)
+                self._push_handler(name+'-data-'+str(server[idx]), local_id, data_tensor, self._data_store)
             else:
                 msg = KVStoreMsg(
                     type=KVMsgType.PUSH, 
@@ -642,7 +646,7 @@ class KVClient(object):
     def pull(self, name, id_tensor):
         """Pull message from KVServer.
 
-        Parameters
+        Parameters 
         ----------
         name : str
             data name
@@ -676,11 +680,11 @@ class KVClient(object):
             partial_id = id_tensor[start:end]
 
             if server[idx] in self._local_server_id and self._close_shared_mem == False:
-                if (name+'-g2l-' in self._has_data) == True:
-                    local_id = self._data_store[name+'-g2l-'][partial_id]
+                if (name+'-g2l-'+str(server[idx]) in self._has_data) == True:
+                    local_id = self._data_store[name+'-g2l-'+str(server[idx])][partial_id]
                 else:
                     local_id = partial_id
-                local_data[server[idx]] = self._pull_handler(name+'-data-', local_id, self._data_store)
+                local_data[server[idx]] = self._pull_handler(name+'-data-'+str(server[idx]), local_id, self._data_store)
             else:
                 msg = KVStoreMsg(
                     type=KVMsgType.PULL, 
@@ -798,6 +802,31 @@ class KVClient(object):
         return IP + ':' + str(port)
 
 
+    def _get_ip_address(self, NICname):
+        """Return IP by given a NIC name
+        """
+        s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+        return socket.inet_ntoa(fcntl.ioctl(
+            s.fileno(),
+            0x8915,  # SIOCGIFADDR
+            struct.pack('256s', NICname[:15].encode("UTF-8"))
+        )[20:24])
+
+
+    def _ip4_addr_list(self):
+        """Return a set of IPv4 address
+        """
+        nic = set()
+
+        for ix in socket.if_nameindex():
+            name = ix[1]
+            ip = self._get_ip_address(name)
+
+            nic.add(ip)
+
+        return nic
+
+
     def _takeId(self, elem):
         """Used by sort
         """

tests/mxnet/ip_config.txt

+0 127.0.0.1 50050
+1 127.0.0.1 50051
+2 127.0.0.1 50052
+3 127.0.0.1 50053
\ No newline at end of file

tests/mxnet/test_kvstore.py

+import dgl
+import argparse
+import mxnet as mx
+import time
+import backend as F
+
+from multiprocessing import Process
+
+ID = []
+ID.append(mx.nd.array([0,1], dtype='int64'))
+ID.append(mx.nd.array([2,3], dtype='int64'))
+ID.append(mx.nd.array([4,5], dtype='int64'))
+ID.append(mx.nd.array([6,7], dtype='int64'))
+
+DATA = []
+DATA.append(mx.nd.array([[1.,1.,1.,],[1.,1.,1.,]]))
+DATA.append(mx.nd.array([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(mx.nd.array([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(mx.nd.array([[4.,4.,4.,],[4.,4.,4.,]]))
+
+edata_partition_book = {'edata':mx.nd.array([0,0,1,1,2,2,3,3], dtype='int64')}
+ndata_partition_book = {'ndata':mx.nd.array([0,0,1,1,2,2,3,3], dtype='int64')}
+
+ndata_g2l = []
+edata_g2l = []
+
+ndata_g2l.append({'ndata':mx.nd.array([0,1,0,0,0,0,0,0], dtype='int64')})
+ndata_g2l.append({'ndata':mx.nd.array([0,0,0,1,0,0,0,0], dtype='int64')})
+ndata_g2l.append({'ndata':mx.nd.array([0,0,0,0,0,1,0,0], dtype='int64')})
+ndata_g2l.append({'ndata':mx.nd.array([0,0,0,0,0,0,0,1], dtype='int64')})
+
+edata_g2l.append({'edata':mx.nd.array([0,1,0,0,0,0,0,0], dtype='int64')})
+edata_g2l.append({'edata':mx.nd.array([0,0,0,1,0,0,0,0], dtype='int64')})
+edata_g2l.append({'edata':mx.nd.array([0,0,0,0,0,1,0,0], dtype='int64')})
+edata_g2l.append({'edata':mx.nd.array([0,0,0,0,0,0,0,1], dtype='int64')})
+
+def start_client(flag):
+    time.sleep(3)
+
+    client = dgl.contrib.start_client(ip_config='ip_config.txt', 
+                                      ndata_partition_book=ndata_partition_book, 
+                                      edata_partition_book=edata_partition_book,
+                                      close_shared_mem=flag)
+
+    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
+    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
+
+    client.barrier()
+
+    tensor_edata = client.pull(name='edata', id_tensor=mx.nd.array([0,1,2,3,4,5,6,7], dtype='int64'))
+    tensor_ndata = client.pull(name='ndata', id_tensor=mx.nd.array([0,1,2,3,4,5,6,7], dtype='int64'))
+
+
+    target_tensor = mx.nd.array([[1., 1., 1.],
+                               [1., 1., 1.],
+                               [2., 2., 2.],
+                               [2., 2., 2.],
+                               [3., 3., 3.],
+                               [3., 3., 3.],
+                               [4., 4., 4.],
+                               [4., 4., 4.]])
+
+    assert F.array_equal(tensor_edata, target_tensor)
+
+    assert F.array_equal(tensor_ndata, target_tensor)
+
+    client.barrier()
+
+    if client.get_id() == 0:
+        client.shut_down()
+
+def start_server(server_id, num_client):
+    
+    dgl.contrib.start_server(
+        server_id=server_id,
+        ip_config='ip_config.txt',
+        num_client=num_client,
+        ndata={'ndata':mx.nd.array([[0.,0.,0.],[0.,0.,0.]])},
+        edata={'edata':mx.nd.array([[0.,0.,0.],[0.,0.,0.]])},
+        ndata_g2l=ndata_g2l[server_id],
+        edata_g2l=edata_g2l[server_id])
+
+if __name__ == '__main__':
+
+    # server process
+    p0 = Process(target=start_server, args=(0, 4))
+    p1 = Process(target=start_server, args=(1, 4))
+    p2 = Process(target=start_server, args=(2, 4))
+    p3 = Process(target=start_server, args=(3, 4))
+
+    # client process
+    p4 = Process(target=start_client, args=(True,))
+    p5 = Process(target=start_client, args=(True,))
+    p6 = Process(target=start_client, args=(False,))
+    p7 = Process(target=start_client, args=(False,))
+
+
+    # start server process
+    p0.start()
+    p1.start()
+    p2.start()
+    p3.start()
+
+    # start client process
+    p4.start()
+    p5.start()
+    p6.start()
+    p7.start()
+
+
+    p0.join()
+    p1.join()
+    p2.join()
+    p3.join()
+
+    p4.join()
+    p5.join()
+    p6.join()
+    p7.join()
\ No newline at end of file

tests/pytorch/ip_config.txt

+0 127.0.0.1 40050
+1 127.0.0.1 40051
+2 127.0.0.1 40052
+3 127.0.0.1 40053
\ No newline at end of file

tests/pytorch/test_kvstore.py

-import backend as F
-import numpy as np
-import scipy as sp
 import dgl
+import argparse
 import torch as th
-from dgl import utils
-
-import os
 import time
+import backend as F
 
-client_namebook = { 0:'127.0.0.1:50061' }
+from multiprocessing import Process
 
-server_namebook = { 0:'127.0.0.1:50062' }
+ID = []
+ID.append(th.tensor([0,1]))
+ID.append(th.tensor([2,3]))
+ID.append(th.tensor([4,5]))
+ID.append(th.tensor([6,7]))
 
-def start_server(server_embed):
-    server = dgl.contrib.KVServer(
-        server_id=0, 
-        client_namebook=client_namebook, 
-        server_addr=server_namebook[0])
+DATA = []
+DATA.append(th.tensor([[1.,1.,1.,],[1.,1.,1.,]]))
+DATA.append(th.tensor([[2.,2.,2.,],[2.,2.,2.,]]))
+DATA.append(th.tensor([[3.,3.,3.,],[3.,3.,3.,]]))
+DATA.append(th.tensor([[4.,4.,4.,],[4.,4.,4.,]]))
 
-    server.init_data(name='server_embed', data_tensor=server_embed)
+edata_partition_book = {'edata':th.tensor([0,0,1,1,2,2,3,3])}
+ndata_partition_book = {'ndata':th.tensor([0,0,1,1,2,2,3,3])}
 
-    server.start()
+ndata_g2l = []
+edata_g2l = []
 
-def start_client(server_embed):
-    client = dgl.contrib.KVClient(
-        client_id=0, 
-        server_namebook=server_namebook, 
-        client_addr=client_namebook[0])
+ndata_g2l.append({'ndata':th.tensor([0,1,0,0,0,0,0,0])})
+ndata_g2l.append({'ndata':th.tensor([0,0,0,1,0,0,0,0])})
+ndata_g2l.append({'ndata':th.tensor([0,0,0,0,0,1,0,0])})
+ndata_g2l.append({'ndata':th.tensor([0,0,0,0,0,0,0,1])})
 
-    client.connect()
+edata_g2l.append({'edata':th.tensor([0,1,0,0,0,0,0,0])})
+edata_g2l.append({'edata':th.tensor([0,0,0,1,0,0,0,0])})
+edata_g2l.append({'edata':th.tensor([0,0,0,0,0,1,0,0])})
+edata_g2l.append({'edata':th.tensor([0,0,0,0,0,0,0,1])})
 
-    # Initialize data on server
-    client.init_data(name='embed_0', server_id=0, shape=[5, 3], init_type='zero')
-    client.init_data(name='embed_1', server_id=0, shape=[5], init_type='uniform', low=0.0, high=0.0)
+def start_client(flag):
+    time.sleep(3)
 
-    data_0 = th.tensor([[0., 0., 0., ], [1., 1., 1.], [2., 2., 2.]])
-    data_1 = th.tensor([0., 1., 2.])
+    client = dgl.contrib.start_client(ip_config='ip_config.txt', 
+                                      ndata_partition_book=ndata_partition_book, 
+                                      edata_partition_book=edata_partition_book,
+                                      close_shared_mem=flag)
 
-    for i in range(5):
-        client.push(name='embed_0', server_id=0, id_tensor=th.tensor([0, 2, 4]), data_tensor=data_0)
-        client.push(name='embed_1', server_id=0, id_tensor=th.tensor([0, 2, 4]), data_tensor=data_1)
-        client.push(name='server_embed', server_id=0, id_tensor=th.tensor([0, 2, 4]), data_tensor=data_1)
+    client.push(name='edata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
+    client.push(name='ndata', id_tensor=ID[client.get_id()], data_tensor=DATA[client.get_id()])
 
     client.barrier()
 
-    client.pull(name='embed_0', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    msg = client.pull_wait()
-    assert msg.rank == 0
-
-    target_tensor_0 = th.tensor(
-        [[ 0., 0., 0.],
-         [ 0., 0., 0.],
-         [ 5., 5., 5.],
-         [ 0., 0., 0.],
-         [10., 10., 10.]])
-
-    assert th.equal(msg.data, target_tensor_0) == True
-
-    client.pull(name='embed_1', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    msg = client.pull_wait()
+    tensor_edata = client.pull(name='edata', id_tensor=th.tensor([0,1,2,3,4,5,6,7]))
+    tensor_ndata = client.pull(name='ndata', id_tensor=th.tensor([0,1,2,3,4,5,6,7]))
 
-    target_tensor_1 = th.tensor([ 0., 0., 5., 0., 10.])
 
-    assert th.equal(msg.data, target_tensor_1) == True
+    target_tensor = th.tensor([[1., 1., 1.],
+                               [1., 1., 1.],
+                               [2., 2., 2.],
+                               [2., 2., 2.],
+                               [3., 3., 3.],
+                               [3., 3., 3.],
+                               [4., 4., 4.],
+                               [4., 4., 4.]])
 
-    client.pull(name='embed_0', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    client.pull(name='embed_1', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    client.pull(name='embed_0', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    client.pull(name='embed_1', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    client.pull(name='server_embed', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
+    assert F.array_equal(tensor_edata, target_tensor)
 
-    msg_0 = client.pull_wait()
-    msg_1 = client.pull_wait()
-    msg_2 = client.pull_wait()
-    msg_3 = client.pull_wait()
-    msg_4 = client.pull_wait()
+    assert F.array_equal(tensor_ndata, target_tensor)
 
-    target_tensor_2 = th.tensor([ 2., 2., 7., 2., 12.])
-
-    assert th.equal(msg_0.data, target_tensor_0) == True
-    assert th.equal(msg_1.data, target_tensor_1) == True
-    assert th.equal(msg_2.data, target_tensor_0) == True
-    assert th.equal(msg_3.data, target_tensor_1) == True
-    assert th.equal(msg_4.data, target_tensor_2) == True
-
-    server_embed += target_tensor_2
-
-    client.pull(name='server_embed', server_id=0, id_tensor=th.tensor([0, 1, 2, 3, 4]))
-    msg_5 = client.pull_wait()
+    client.barrier()
 
-    assert th.equal(msg_5.data, target_tensor_2 * 2) == True
+    if client.get_id() == 0:
+        client.shut_down()
 
-    client.shut_down()
+def start_server(server_id, num_client):
+    
+    dgl.contrib.start_server(
+        server_id=server_id,
+        ip_config='ip_config.txt',
+        num_client=num_client,
+        ndata={'ndata':th.tensor([[0.,0.,0.],[0.,0.,0.]])},
+        edata={'edata':th.tensor([[0.,0.,0.],[0.,0.,0.]])},
+        ndata_g2l=ndata_g2l[server_id],
+        edata_g2l=edata_g2l[server_id])
 
 if __name__ == '__main__':
-    server_embed = th.tensor([2., 2., 2., 2., 2.])
-    # use pytorch shared memory
-    server_embed.share_memory_()
-
-    pid = os.fork()
-    if pid == 0:
-        start_server(server_embed)
-    else:
-        time.sleep(2) # wait server start
-        start_client(server_embed)
-
-    assert th.equal(server_embed, th.tensor([ 4., 4., 14., 4., 24.])) == True
+
+    # server process
+    p0 = Process(target=start_server, args=(0, 4))
+    p1 = Process(target=start_server, args=(1, 4))
+    p2 = Process(target=start_server, args=(2, 4))
+    p3 = Process(target=start_server, args=(3, 4))
+
+    # client process
+    p4 = Process(target=start_client, args=(True,))
+    p5 = Process(target=start_client, args=(True,))
+    p6 = Process(target=start_client, args=(False,))
+    p7 = Process(target=start_client, args=(False,))
\ No newline at end of file
+
+
+    # start server process
+    p0.start()
+    p1.start()
+    p2.start()
+    p3.start()
+
+    # start client process
+    p4.start()
+    p5.start()
+    p6.start()
+    p7.start()
+
+
+    p0.join()
+    p1.join()
+    p2.join()
+    p3.join()
+
+    p4.join()
+    p5.join()
+    p6.join()
+    p7.join()
\ No newline at end of file