Memory Error Python
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Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Memory errors and how to solve memory error in python list limits? up vote 31 down vote favorite 11 I need to produce large and big (very) matrices (Markov chains) for scientific purposes. I perform calculus that I put in a list of 20301 elements (=one row of my matrix). I need all those data in memory to proceed next Markov step but i can store them elsewhere (eg file) if needed even if it python memory error large array will slow my Markov chain walk-through. My computer (scientific lab): Bi-xenon 6 cores/12threads each, 12GB memory, OS: win64 Traceback (most recent call last): File "my_file.py", line 247, in
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Increase The Amount Of Memory The Python Process Has Access To
ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 6.2 million http://stackoverflow.com/questions/5537618/memory-errors-and-list-limits programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Python/Numpy MemoryError up vote 10 down vote favorite 7 Basically, I am getting a memory error in python when trying to perform an algebraic operation on a numpy matrix. The variable u, is a large matrix of double (in http://stackoverflow.com/questions/4318615/python-numpy-memoryerror the failing case its a 288x288x156 matrix of doubles. I only get this error in this huge case, but I am able to do this on other large matrices, just not this big). Here is the Python error: Traceback (most recent call last): File "S:\3D_Simulation_Data\Patient SPM Segmentation\20 pc t perim erosion flattop\SwSim.py", line 121, in __init__ self.mainSimLoop() File "S:\3D_Simulation_Data\Patient SPM Segmentation\20 pc t perim erosion flattop\SwSim.py", line 309, in mainSimLoop u = solver.solve_cg(u,b,tensors,param,fdHold,resid) # Solve the left hand si de of the equation Au=b with conjugate gradient method to approximate u File "S:\3D_Simulation_Data\Patient SPM Segmentation\20 pc t perim erosion flattop\conjugate_getb.py", line 47, in solv e_cg u = u + alpha*p MemoryError u = u + alpha*p is the line of code that fails. alpha is just a double, while u and r are the large matrices described above (both of the same size). I don't know that much about memory errors especially in Python. Any insight/tips into solving this would be very
This module never needs to be imported explicitly: the exceptions are provided in the built-in namespace as well as the exceptions module. For https://docs.python.org/2/library/exceptions.html class exceptions, in a try statement with an except clause that mentions a particular class, that clause also handles any exception classes derived from that class (but http://www.gossamer-threads.com/lists/python/dev/705452 not exception classes from which it is derived). Two exception classes that are not related via subclassing are never equivalent, even if they have the same name. The built-in memory error exceptions listed below can be generated by the interpreter or built-in functions. Except where mentioned, they have an "associated value" indicating the detailed cause of the error. This may be a string or a tuple containing several items of information (e.g., an error code and a string explaining the code). The associated value is the second argument to the python memory error raise statement. If the exception class is derived from the standard root class BaseException, the associated value is present as the exception instance's args attribute. User code can raise built-in exceptions. This can be used to test an exception handler or to report an error condition "just like" the situation in which the interpreter raises the same exception; but beware that there is nothing to prevent user code from raising an inappropriate error. The built-in exception classes can be subclassed to define new exceptions; programmers are encouraged to derive new exceptions from the Exception class or one of its subclasses, and not from BaseException. More information on defining exceptions is available in the Python Tutorial under User-defined Exceptions. The following exceptions are only used as base classes for other exceptions. exception BaseException¶ The base class for all built-in exceptions. It is not meant to be directly inherited by user-defined classes (for that, use Exception). If str() or unicode() is called on an instance of t
Post #1 of 7 (3821 views) Permalink MemoryError when list append... plz help ====================== s=[] for i in range(11000-1): for j in range(i+1, 11000): .... s.append(((i,j),sim)) ====================== above sim is floating type. s.append is totally coducted 60,494,500 times. but this code raise MemoryError. My computer has 4G RAM. i think it's enough. but it doesn't... So, i've tested below code. ====================== a=[] i=0 while i<60494500 : a.append(i) i+=1 ====================== but this code raise also MemoryError. How can i resolve this problem? please, help... Regards, -- View this message in context: http://www.nabble.com/MemoryError-when-list-append...-plz-help-tp21227745p21227745.html Sent from the Python - python-list mailing list archive at Nabble.com. -- http://mail.python.org/mailman/listinfo/python-list prologic at shortcircuit Dec30,2008,10:17PM Post #2 of 7 (3774 views) Permalink Re: MemoryError when list append... plz help [In reply to] (Sorry for top posting): You are mad! Why on God's earth would you want to create a list containing 60 MILLION elements ? What is the use case ? What are you solving ? You may have 4G of ram, but I very seriously doubt you have 4G of ram available to Python. I have no idea how many bytes of memory storing each element of a list consumes let alone each float object, but I assure you it's not going to be anywhere near that of 60494500 4-bytes spaces (do floats in C normally consume 4 bytes) in C. --JamesMills -- -- "Problems are solved by method" On Wed, Dec 31, 2008 at 4:02 PM, [BON] <alooha [at] live> wrote: > > ====================== > s=[] > for i in range(11000-1): > for j in range(i+1, 11000): > .... > s.append(((i,j),sim)) > ====================== > above sim is floating type. > s.append is totally coducted 60,494,500 times. > but this code raise MemoryError. > > My computer has 4G RAM. > i think it's enough. but it doesn't... > > So, i've tested below code. > ====================== > a=[] > i=0 > while i<60494500 : > a.append(i) > i+=1 > ====================== > but this code raise also MemoryError. > > How can i resolve this problem? > please, help... > > Regards, > -- > View this message in context: http://www.nabble.com/MemoryError-when-list-append...-plz-help-tp21227745p21227745.html > Sent from the Python - python-list mailing list archive at Nabble.com. > > -- > http://mail.python.org/ma