[Chennaipy] Mutli- threading in cython

[aishwarya selvaraj]

 Hi,
Yes, I was able to make use of  PyArray_NewFromDescr in my code. Storing
into a 3D array has now become a lot faster. Thank you!But the CCD images
stored using this method looks quite different from the ones
acquired earlier.
In the older method at the end of for loop there is incrementing using
 _puc_image
+= aoiStride, I'm not very sure on how to do it with new method. Could you
please take a look at it? I'm not very sure what am I missing here.
ᐧ

>
>> dims[0] = self.aoiWidth
>
> dims[1] = self.aoiHeight
>
>                         #method 1
>
> data[i,:,:] = PyArray_NewFromDescr(<PyTypeObject *> np.ndarray,
>> np.dtype('<B'), 2,dims, NULL,pBuf, np.NPY_C_CONTIGUOUS, None)
>
> #-----------------------------------------------------------
>> ------------------------------------------------
>
> #method 2:
>
> #if (i==0) or (i == 1) or (i ==2) or (i==3) or (i==4):
>
> #_puc_image = pBuf
>
> #pus_image = <unsigned short*>pBuf
>
> #for j in range(self.aoiWidth/self.hbin):
>
> #pus_image = <unsigned short*>(_puc_image)
>
> #for k in range(self.aoiHeight/self.vbin):
>
> #data[l][j][k]  = pus_image[0]
>
> #pus_image += 1
>
> #_puc_image += aoiStride
>
> #l = l+1
>
> the image displayed using method 1 is very different from method 1.

ᐧ

On Thu, May 24, 2018 at 9:34 AM, aishwarya selvaraj <
aishwaryaselvaraj1708 at gmail.com> wrote:

> Hi, Yes I was able to make use of  PyArray_NewFromDescr in my code.
> Storing into a 3D array has now become a lot faster.Thank you!
> But the CCD images stored using this method looks quite different from the
> ones acquired earlier. I'm yet to find the root of the problem for the same.
> Could you please take a look at it? I'm not very sure what am I missing
> here.
> ᐧ
>
> On Wed, May 23, 2018 at 7:43 AM, Aravindhan K <aravindhank1994 at gmail.com>
> wrote:
>
>> Hi,
>> Please use this example code. https://pastebin.com/nh9rvqfm.
>> I have used this link as a reference.
>> https://groups.google.com/forum/#!topic/cython-users/fFBiCCwblD0
>>
>>
>> Regards,
>> Aravindhan K
>>
>> On Tue, May 22, 2018 at 11:58 AM, aishwarya selvaraj <
>> aishwaryaselvaraj1708 at gmail.com> wrote:
>>
>>> Hi,
>>> Thank you for the suggestion. I was trying out an example code using
>>> PyArray_NewFromDescr*.* PFA of the code.I compiled the file using
>>> :python setup.py build_ext --inplace.
>>> When compiled I get the following error :
>>> fatal error : numpy/arrayobject.h :No such file or directory.
>>> I would be realy gratefull if you could do the edit in the file I sent
>>> in my first mail.
>>>
>>> ᐧ
>>>
>>> On Mon, May 21, 2018 at 9:19 PM, Aravindhan K <aravindhank1994 at gmail.com
>>> > wrote:
>>>
>>>> Hi,
>>>>
>>>> You could try using PyArray_NewFromDescr NumPy C-API function for
>>>> creating nd-array
>>>> in function capturing frames.
>>>> than doing nested loops to do copy byte by byte. (This could be the
>>>> bottleneck)
>>>> https://docs.scipy.org/doc/numpy-1.14.0/reference/c-api.arra
>>>> y.html#from-scratch
>>>>
>>>>
>>>> Regards,
>>>> Aravindhan K
>>>>
>>>> On Mon, May 21, 2018 at 5:12 PM, aishwarya selvaraj <
>>>> aishwaryaselvaraj1708 at gmail.com> wrote:
>>>>
>>>>> Dear all,
>>>>> I was programming for Andor CCD using SDK libraries in python using
>>>>> cython.
>>>>> I have a piece of code within my .pyx script which does the function
>>>>> of storing the data into a 3D array. While acquiring n frames, each of them
>>>>> is stored in a 3D array named data, which later I would be displaying. But
>>>>> this creates a bottleneck in my code.
>>>>> Hence I need to introduce threading, such that for each frame to be
>>>>> stored there are individual threads for the same and the frames could be
>>>>> displayed simultaneously without creating a performance lag.
>>>>> Since I have never worked on multithreading, could anyone please help
>>>>> me.
>>>>> PFA of the code. (LiveAcquisition code)
>>>>>
>>>>>
>>>>> --
>>>>> Regards,
>>>>> Aishwarya Selvaraj
>>>>>
>>>>> _______________________________________________
>>>>> Chennaipy mailing list
>>>>> Chennaipy at python.org
>>>>> https://mail.python.org/mailman/listinfo/chennaipy
>>>>>
>>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Regards,
>>> Aishwarya Selvaraj
>>>
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>>>
>>
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>
>
> --
> Regards,
> Aishwarya Selvaraj
>



-- 
Regards,
Aishwarya Selvaraj
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