我的程序可以根据使用情况突然分配大量RAM。 我想限制它可以从系统获取的RAM。
我在这里看到: Limit RAM usage to python program
但是它仅适用于Unix。 Windows是否有解决方案?
答案 0 :(得分:3)
Job object支持限制进程的提交内存。在Python中,我们可以通过PyWin32或ctypes来实现。
请注意,在Windows 8之前,一个进程只能在一个Job中。担心这两种常见情况包括:在作业中运行python.exe的py.exe启动器(.py文件的默认关联),以及在作业中运行每个任务的任务计划程序服务。 / p>
import sys
import warnings
import winerror
import win32api
import win32job
g_hjob = None
def create_job(job_name='', breakaway='silent'):
hjob = win32job.CreateJobObject(None, job_name)
if breakaway:
info = win32job.QueryInformationJobObject(hjob,
win32job.JobObjectExtendedLimitInformation)
if breakaway == 'silent':
info['BasicLimitInformation']['LimitFlags'] |= (
win32job.JOB_OBJECT_LIMIT_SILENT_BREAKAWAY_OK)
else:
info['BasicLimitInformation']['LimitFlags'] |= (
win32job.JOB_OBJECT_LIMIT_BREAKAWAY_OK)
win32job.SetInformationJobObject(hjob,
win32job.JobObjectExtendedLimitInformation, info)
return hjob
def assign_job(hjob):
global g_hjob
hprocess = win32api.GetCurrentProcess()
try:
win32job.AssignProcessToJobObject(hjob, hprocess)
g_hjob = hjob
except win32job.error as e:
if (e.winerror != winerror.ERROR_ACCESS_DENIED or
sys.getwindowsversion() >= (6, 2) or
not win32job.IsProcessInJob(hprocess, None)):
raise
warnings.warn('The process is already in a job. Nested jobs are not '
'supported prior to Windows 8.')
def limit_memory(memory_limit):
if g_hjob is None:
return
info = win32job.QueryInformationJobObject(g_hjob,
win32job.JobObjectExtendedLimitInformation)
info['ProcessMemoryLimit'] = memory_limit
info['BasicLimitInformation']['LimitFlags'] |= (
win32job.JOB_OBJECT_LIMIT_PROCESS_MEMORY)
win32job.SetInformationJobObject(g_hjob,
win32job.JobObjectExtendedLimitInformation, info)
def main():
assign_job(create_job())
memory_limit = 100 * 1024 * 1024 # 100 MiB
limit_memory(memory_limit)
try:
bytearray(memory_limit)
except MemoryError:
print('Success: available memory is limited.')
else:
print('Failure: available memory is not limited.')
return 0
if __name__ == '__main__':
sys.exit(main())
答案 1 :(得分:0)
除了要限制使用的物理RAM数量(而不是虚拟内存)以外,我和OP大约有相同的问题。 @eryksun的答案和@objc func validate(){
var filteredArray = [textFieldOne,textFieldTwo,textFieldThree,textFieldFour].filter { $0?.text == "" }
if !filteredArray.isEmpty {
button.isHidden = true
} else {
button.isHidden = false
}
}
函数的效果很好,但是限制了可分配内存(虚拟内存)的总量。这是他/她的代码的附加功能,可限制物理内存量(“工作集”)。
limit_memory()