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    <blockquote> <p>I don't know how it is done under Windows. Hopefully someone else can supply that part of the solution.</p> </blockquote> <p>Here's some example code to set the limit on Windows using <code>ctypes</code>...</p> <pre><code>import ctypes PROCESS_SET_QUOTA = 0x100 PROCESS_TERMINATE = 0x1 JobObjectExtendedLimitInformation = 9 JOB_OBJECT_LIMIT_PROCESS_MEMORY = 0x100 class IO_COUNTERS(ctypes.Structure): _fields_ = [('ReadOperationCount', ctypes.c_uint64), ('WriteOperationCount', ctypes.c_uint64), ('OtherOperationCount', ctypes.c_uint64), ('ReadTransferCount', ctypes.c_uint64), ('WriteTransferCount', ctypes.c_uint64), ('OtherTransferCount', ctypes.c_uint64)] class JOBOBJECT_BASIC_LIMIT_INFORMATION(ctypes.Structure): _fields_ = [('PerProcessUserTimeLimit', ctypes.c_int64), ('PerJobUserTimeLimit', ctypes.c_int64), ('LimitFlags', ctypes.c_uint32), ('MinimumWorkingSetSize', ctypes.c_void_p), ('MaximumWorkingSetSize', ctypes.c_void_p), ('ActiveProcessLimit', ctypes.c_uint32), ('Affinity', ctypes.c_void_p), ('PriorityClass', ctypes.c_uint32), ('SchedulingClass', ctypes.c_uint32)] class JOBOBJECT_EXTENDED_LIMIT_INFORMATION(ctypes.Structure): _fields_ = [('BasicLimitInformation', JOBOBJECT_BASIC_LIMIT_INFORMATION), ('IoInfo', IO_COUNTERS), ('ProcessMemoryLimit', ctypes.c_void_p), ('JobMemoryLimit', ctypes.c_void_p), ('PeakProcessMemoryUsed', ctypes.c_void_p), ('PeakJobMemoryUsed', ctypes.c_void_p)] # Set memory limit for process with specfied 'pid', to specified 'size' in bytes def set_limit(pid, size): job_info = JOBOBJECT_EXTENDED_LIMIT_INFORMATION() out_size = ctypes.c_uint32() job = ctypes.windll.kernel32.CreateJobObjectA(None, None) assert job != 0 success = ctypes.windll.kernel32.QueryInformationJobObject(job, JobObjectExtendedLimitInformation, ctypes.POINTER(JOBOBJECT_EXTENDED_LIMIT_INFORMATION)(job_info), ctypes.sizeof(JOBOBJECT_EXTENDED_LIMIT_INFORMATION), ctypes.POINTER(ctypes.c_uint32)(out_size)) assert success job_info.BasicLimitInformation.LimitFlags |= JOB_OBJECT_LIMIT_PROCESS_MEMORY job_info.ProcessMemoryLimit = size success = ctypes.windll.kernel32.SetInformationJobObject(job, JobObjectExtendedLimitInformation, ctypes.POINTER(JOBOBJECT_EXTENDED_LIMIT_INFORMATION)(job_info), ctypes.sizeof(JOBOBJECT_EXTENDED_LIMIT_INFORMATION)) assert success process = ctypes.windll.kernel32.OpenProcess(PROCESS_SET_QUOTA | PROCESS_TERMINATE, False, pid) assert process != 0 success = ctypes.windll.kernel32.AssignProcessToJobObject(job, process) assert success success = ctypes.windll.kernel32.CloseHandle(job) assert success success = ctypes.windll.kernel32.CloseHandle(process) assert success if __name__ == '__main__': import os five_mb = 5 * 1024 * 1024 def can_we_allocate_five_mb(): try: s = 'x' * five_mb return True except MemoryError: return False print can_we_allocate_five_mb() set_limit(os.getpid(), five_mb) print can_we_allocate_five_mb() </code></pre> <p>...although there's probably no need to create a separate job objects for each process - you should be able to associate all restricted processes with a single job.</p>
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    1. POHow to set memory limit for thread or process in python?
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