Well, this is weird, when I run the attached code in jupyter I get
the GpuArrayException: b'an illegal memory access was encountered'
exception.
When I run this as a standalone script I
get pygpu.gpuarray.GpuArrayException: b'out of memory', which shouldn't
happen as running the theano function on a single GPU consumes 2820MiB /
4030MiB (according to nvidia-smi).
I use THEANO_FLAGS="contexts=dev1->cuda1;dev2->cuda2" python3
crash_sample.py to run the script.
The problem persists in cudnn v 5.0, 5.1, 6.0
Adding CUDA_LAUNCH_BLOCKING=1 doesn't seem to change anything
среда, 12 апреля 2017 г., 21:13:22 UTC+3 пользователь Adam Stooke написал:
>
> Nevermind about that libgpuarray github issue....was something else....but
> running with CUDA_LAUNCH_BLOCKING=1 led me directly to the problem, which
> turned out to be in an operation entirely different from where the original
> illegal memory error appeared.
>
> On Wednesday, April 12, 2017 at 7:25:43 AM UTC-7, nouiz wrote:
>>
>> Do you have a script we could run to reproduce it? It would help
>> investigate this. Also give us the Theano flags that you use to reproduce
>> this.
>>
>> thanks
>>
>> Fred
>>
>> On Wed, Apr 5, 2017 at 12:54 PM Sergey Ovcharenko <ovchare...@gmail.com>
>> wrote:
>>
>>> Hi,
>>>
>>> I'm struggling to get a theano graph spread over two GPU's working, but
>>> I keep encountering the GpuArrayException: b'an illegal memory access was
>>> encountered' error (full traceback is in the end of this email).
>>> The basic idea is to do a forward pass through two neural networks, each
>>> located on a separate device each and combine the outputs.
>>>
>>> I'm using the latest Theano, libgpuarray and Lasagne to build the
>>> networks, and have hacked Lasagne a bit to able to pass target='device' to
>>> the shared variable constructor during weights initialization.
>>>
>>> I have THEANO_FLAGS="contexts=dev1->cuda1;dev2->cuda2" and the output
>>> after theano import is:
>>> Using cuDNN version 5005 on context None
>>> Mapped name None to device cuda: GeForce GTX 980 (0000:0A:00.0)
>>> Using cuDNN version 5005 on context dev1
>>> Mapped name dev1 to device cuda1: GeForce GTX 980 (0000:09:00.0)
>>> Using cuDNN version 5005 on context dev2
>>> Mapped name dev2 to device cuda2: GeForce GTX 980 (0000:06:00.0)
>>>
>>>
>>> The networks definition is quite lengthy (and doesn't always reproduce
>>> on toy graphs), so I'm providing a simpified example of what I'm doing.
>>> inp_0 = T.tensor4('inp0')
>>> r0 = build_model('dev1', input_var=inp_0)
>>> inp_1 = T.tensor4('inp1')
>>> r1 = build_model("dev2", input_var=inp_1)
>>>
>>> r0_out = lasagne.layers.get_output(r0['fc6'], deterministic=False)
>>> r1_out = lasagne.layers.get_output(r1['fc6'], deterministic=False)
>>>
>>> train_r0 = theano.function(
>>> [inp_0, inp_1],
>>> [r0_out, r1_out]
>>> )
>>>
>>> result0 = train_r0(x, x2)
>>> This code fails with the aforementioned error.
>>>
>>> I've also tried to compile a separate function for each of the networks,
>>> like
>>> train_r0 = theano.function(
>>> [inp_0],
>>> [r0_out]
>>> )
>>>
>>> train_r1 = theano.function(
>>> [inp_1],
>>> [r1_out]
>>> )
>>>
>>> And running either train_r0 or train_r1 fails. But compiling and running
>>> a single function (no matter train_r0 or train_r1) works just fine.
>>> Could someone help me debug this? Please let me know if I should provide
>>> additional code/info.
>>>
>>> Thanks,
>>> Sergey.
>>>
>>> The full traceback:
>>>
>>> RuntimeError Traceback (most recent call last)
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/compile/function_module.py
>>> in __call__(self, *args, **kwargs)
>>> 883 outputs =\
>>> --> 884 self.fn() if output_subset is None else\
>>> 885 self.fn(output_subset=output_subset)
>>>
>>> RuntimeError: Error in the elemwise call
>>>
>>> During handling of the above exception, another exception occurred:
>>>
>>> GpuArrayException Traceback (most recent call last)
>>> <ipython-input-11-902c3b4617f7> in <module>()
>>> ----> 1 result0 = train_r0(x, x2)
>>> 2 #result1 = train_r1(x2)
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/compile/function_module.py
>>> in __call__(self, *args, **kwargs)
>>> 896 node=self.fn.nodes[self.fn.position_of_error],
>>> 897 thunk=thunk,
>>> --> 898 storage_map=getattr(self.fn, 'storage_map',
>>> None))
>>> 899 else:
>>> 900 # old-style linkers raise their own exceptions
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/link.py
>>> in raise_with_op(node, thunk, exc_info, storage_map)
>>> 139
>>> 140 hints = []
>>> --> 141 detailed_err_msg = "\nApply node that caused the error: " +
>>> str(node)
>>> 142 if exc_value.__applynode_index__ is not None:
>>> 143 detailed_err_msg += "\nToposort index: %d" % node_index
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/graph.py
>>> in __str__(self)
>>> 178
>>> 179 def __str__(self):
>>> --> 180 return op_as_string(self.inputs, self)
>>> 181
>>> 182 def __repr__(self):
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/graph.py
>>> in op_as_string(i, op, leaf_formatter, node_formatter)
>>> 1256 between i and o
>>> 1257 """
>>> -> 1258 strs = as_string(i, op.inputs, leaf_formatter, node_formatter)
>>> 1259 return node_formatter(op, strs)
>>> 1260
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/graph.py
>>> in as_string(i, o, leaf_formatter, node_formatter)
>>> 1336 return leaf_formatter(r)
>>> 1337
>>> -> 1338 return [describe(output) for output in o]
>>> 1339
>>> 1340
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/graph.py
>>> in <listcomp>(.0)
>>> 1336 return leaf_formatter(r)
>>> 1337
>>> -> 1338 return [describe(output) for output in o]
>>> 1339
>>> 1340
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gof/graph.py
>>> in describe(r)
>>> 1334 return s
>>> 1335 else:
>>> -> 1336 return leaf_formatter(r)
>>> 1337
>>> 1338 return [describe(output) for output in o]
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/theano/gpuarray/type.py
>>> in __str__(self)
>>> 604 except gpuarray.GpuArrayException:
>>> 605 np_data = self.data
>>> --> 606 return "GpuArrayConstant{%s}" % np_data
>>> 607
>>> 608
>>>
>>> pygpu/gpuarray.pyx in pygpu.gpuarray.GpuArray.__str__
>>> (pygpu/gpuarray.c:28703)()
>>>
>>> /home/facenx/.virtualenvs/multitheano/lib/python3.5/site-packages/numpy/core/numeric.py
>>> in asarray(a, dtype, order)
>>> 529
>>> 530 """
>>> --> 531 return array(a, dtype, copy=False, order=order)
>>> 532
>>> 533
>>>
>>> pygpu/gpuarray.pyx in pygpu.gpuarray.GpuArray.__array__
>>> (pygpu/gpuarray.c:21616)()
>>>
>>> pygpu/gpuarray.pyx in pygpu.gpuarray._pygpu_as_ndarray
>>> (pygpu/gpuarray.c:18322)()
>>>
>>> pygpu/gpuarray.pyx in pygpu.gpuarray.array_read (pygpu/gpuarray.c:6923)()
>>>
>>> GpuArrayException: b'an illegal memory access was encountered'
>>>
>>>
>>>
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>>>
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import theano
import theano.tensor as T
import lasagne
from lasagne.layers import InputLayer, DenseLayer
from lasagne.layers import Conv2DLayer as ConvLayer, Pool2DLayer as PoolLayer
import numpy as np
class ContextIinitializer():
def __init__(self, context, lasagne_init=lasagne.init.GlorotUniform()):
self.initializer = lasagne_init
self.context = context
def __call__(self, shape):
values = self.initializer(shape)
return theano.shared(values, target=self.context)
def build_model(target, input_var=None):
net = {}
xavier_init = ContextIinitializer(target)
constant_init = ContextIinitializer(target, lasagne_init=lasagne.init.Constant())
net['input'] = InputLayer((32, 3, 96, 96), input_var=input_var)
net['conv1a'] = ConvLayer(net['input'], num_filters=768, filter_size=3, pad=0, flip_filters=False,
W=xavier_init, b=constant_init)
net['conv1b'] = ConvLayer(net['conv1a'], num_filters=768, filter_size=3, pad=0, flip_filters=False,
W=xavier_init, b=constant_init)
net['pool1b'] = PoolLayer(net['conv1b'], pool_size=2, stride=2, mode='max', ignore_border=True)
net['fc1'] = DenseLayer(net['pool1b'], num_units=160, nonlinearity=None, W=xavier_init, b=constant_init)
net['fc2'] = DenseLayer(net['fc1'], num_units=1000, nonlinearity=None, W=xavier_init, b=constant_init)
return net
x, y = np.zeros((32, 3, 96, 96), dtype=np.float32), np.arange(32)
x2, y2 = np.zeros((32, 3, 96, 96), dtype=np.float32), np.arange(32)
inp_0 = T.tensor4('inp0')
r0 = build_model('dev1', input_var=inp_0)
inp_1 = T.tensor4('inp1')
r1 = build_model("dev2", input_var=inp_1)
r0_out = lasagne.layers.get_output(r0['fc2'])
r1_out = lasagne.layers.get_output(r1['fc2'])
train_r0 = theano.function(
[inp_0],
[r0_out],
allow_input_downcast=True
)
train_r1 = theano.function(
[inp_0, inp_1],
[r1_out, r0_out],
allow_input_downcast=True
)
result0 = train_r0(x)
print(result0[0].sum())
result1 = train_r1(x, x2)
print(result1[0].sum())
