Openresty torch GPU module loading issue - nginx

Question

I am using openresty with lua. When I was loading torch without cutorch,cunn(GPU) it was working fine. But it is unable to load cutorch module.
Here is my nginx.conf
error_log stderr notice;
daemon off;
events{}
http {
lua_code_cache on;
#lua_package_cpath '/usr/local/cuda/include/?.so;;';
init_by_lua_file 'evaluate.lua';
server {
listen 6788;
lua_code_cache on;
lua_need_request_body on;
client_body_buffer_size 10M;
client_max_body_size 10M;
location /ff {
# only permit POST requests
if ($request_method !~ ^(POST)$ ) {
return 403;
}
content_by_lua '
local body = ngx.req.get_body_data()
if body == nil then
ngx.say("empty body")
else
local resp =FeedForward(body)
ngx.say(cjson.encode({result=resp}))
end
';
}
}
}
Here is my evaluate.lua code
-- load the required lua models
torch = require("torch")
nn = require("nn")
gm = require("image")
cutorch = require "cutorch"
cunn = require "cunn"
cjson = require("cjson")
-- model
modelPath='./model.t7'
ninputs = 3
model = nn.Sequential()
model:add(nn.Linear(ninputs,2))
-- let’s save a dummy model
-- to demonstrate the functionality
torch.save(modelPath, model)
-- load a pretrained model
net = torch.load(modelPath)
net:cuda()
net:evaluate()
-- our end point function
-- this function is called by the ngx server
-- accepts a json body
function FeedForward(json)
print("starting")
-- decode and extract field x
local data = cjson.decode(json)
local input = torch.Tensor(data.x)
local response = {}
-- example checks
if input == nil then
print("No input given")
elseif input:size(1) ~=ninputs then
print("Wrong input size")
else
-- evaluat the input and create a response
local output = net:forward(input:cuda()):float()
-- from tensor to table
for i=1,output:size(1) do
response[i] = output[i]
end
end
-- return response
return response
end
I am trying to run the model using following commands
/usr/local/openresty/nginx/sbin/nginx -p "$(pwd)" -c "nginx.conf"
It's starting up fine but when I am sending curl request like
curl -H "Content-Type: application/json" -X POST -d '{"x":[1,2,3]}' http://localhost:6788/ff
I am getting following error.
2016/09/29 12:59:59 [notice] 10355#0: *1 [lua] evaluate.lua:28: FeedForward(): starting, client: 127.0.0.1, server: , request: "POST /ff HTTP/1.1", host: "localhost:6788"
THCudaCheck FAIL file=/tmp/luarocks_cutorch-scm-1-700/cutorch/lib/THC/generic/THCStorage.cu line=40 error=3 : initialization error
2016/09/29 12:59:59 [error] 10355#0: *1 lua entry thread aborted: runtime error: unknown reason
stack traceback:
coroutine 0:
[C]: in function 'resize'
/home/ubuntu/torch/install/share/lua/5.1/cutorch/Tensor.lua:14: in function 'cuda'
/rootpath/evaluate.lua:41: in function 'FeedForward'
content_by_lua(nginx.conf:31):7: in function <content_by_lua(nginx.conf:31):1>, client: 127.0.0.1, server: , request: "POST /ff HTTP/1.1", host: "localhost:6788"
Without cutorch the model is running fine like If I remove
net:cuda()
and replace line
local output = net:forward(input:cuda()):float()
by
local output = net:forward(input):float()
It's working fine. Also I tried to run evaluate.lua using th and it's working fine there with cutorch and cunn packages.