Question or problem about Python programming:
UPDATE:- This problem solved itself after a machine reboot. Not yet able to figure out why this error was happening before.
I have a function that loads a huge numpy array (~ 980MB) and returns it.
When I first start Ipython and call this function, it loads the array into the variable without any problem.
But if I run the same command again, it exits raising a “Memory Error”.
I tried the following,
del hugeArray
Still the same error was occurring.
I even tried the following
del hugeArray gc.collect() gc.collect()
Initially, gc.collect() returned 145 and the second call returned 48.
But even after this when I call the function, it was still raising a Memory error.
The only way I could load again was to restart ipython.
Is there something I can do to free all memory in ipython, so that I don’t have to restart it?
—————-Update
Following is the output of %whos
Variable Type Data/Info ------------------------------ gc module gr module <...>rom 'Generate4mRamp.pyc'> np module <...>ages/numpy/__init__.pyc'> plt module <...>s/matplotlib/pyplot.pyc'>
Out of this, gr is my module containing the function which i used to load the data cube.
———How to Reproduce the error
The following simple function is able to reproduce the error.
import numpy as np
import gc
def functionH():
cube=np.zeros((200,1024,1024))
return cube
testcube=functionH() #Runs without any issue
del testcube
testcube=functionH() # Raises Memory Error
del testcube
gc.collect()
gc.collect()
testcube=functionH() # Still Raises Memory Error
This error is occurring only in Ipython. In simple python (>>>) after giving del testcube, there is no Memory Error.
How to solve the problem:
Are you looking at the value? IPython caches output variables as e.g. Out[8], so if you examine it, it will be kept in memory.
You can do %xdel testcube to delete the variable and remove it from IPython’s cache. Alternatively, %reset out or %reset array will clear either all your output history, or only references to numpy arrays.
