Write in front
Security Butler Assistant or something like that always comes with a memory accelerator ball, which has the function of shutting down processes and cleaning up memory. Although in essence, memory cleaning is just a cover and has no actual effect, but after you perform deep cleaning, the visible memory decrease is indeed very decompressing. However, having to open the security software every time to enjoy the pleasure of decompression is really a waste of money, so I wanted to try writing it myself for fun.
Memory cleaning
Here I use python to write.
After searching, I determined two solutions, one is to clean up through the memory recycling mechanism that comes with Windows, and the other is to clean up through an API EmptyWorkingSet provided by Windows. Let’s compare it below.
Windows’ own memory recycling mechanism
Trigger Windows’ memory recycling mechanism by applying for a large amount of memory to clean up the memory.
import psutil import ctypes mem = psutil.virtual_memory() size = mem.total // 2 buffer = ctypes.create_string_buffer(size) del buffer
Here the total memory is obtained through psutil, and a buffer of half the total is created through the ctypes library, and then deleted immediately.
However, this will cause temporary lags and visible memory increases. And it was not cleaned cleanly. It would not be smooth at all to give up this plan decisively.
EmptyWorkingSet
EmptyWorkingSet is an API of Windows, which is used to clear the working set in the memory of the specified process. Define the physical memory used by the program as dirty pages and transfer them to the memory swap file on the disk. Clear the physical memory occupied by the process. When the process needs it again, it will be loaded from the external memory again. Then the loading process may cause temporary lag.
Most acceleration balls on the market should use this technology.
It is also very convenient to implement through the psutil library and win32-related libraries.
import win32api
import win32con
import win32process
import psutil
for pid in psutil.pids():
try:
handle = win32api.OpenProcess(win32con.PROCESS_ALL_ACCESS, False, pid)
win32process.SetProcessWorkingSetSize(handle, -1, -1)
win32api.EmptyWorkingSet(handle)
exceptException:
continue
After comparing with a certain housekeeper, it was found that the effect was not much different. They may have done some optimization of memory organization.
Process terminated
Killing processes is even simpler. In order to avoid problems here, I only keep their parent processes, which is still implemented through psutil.
import psutil
pid_set = set()
processes = []
# Only traverse running processes
for pid in psutil.pids():
if pid in pid_set:
continue
try:
proc = psutil.Process(pid)
except psutil.NoSuchProcess:
continue
# Only process the parent process
proc_p = proc.parent()
if proc_p is not None:
proc = proc_p
if proc.pid in pid_set:
continue
pid_set.add(proc.pid)
# Generate process information
process_info = proc.as_dict(attrs=['pid', 'name', 'username', 'status', 'memory_info'])
process.append(process_info)
Killing the process is achieved through the following code. The pid is the pid of the specified process.
psutil.Process(pid).kill()
At this point, the core functions are completed.
Complete development
Since it is an acceleration ball, it definitely needs an interface. Here I drew a picture in PS, and then wrote an interface using PyQt5 (I was really nauseous while writing it)
The last effect is as follows
Double-click to clean up memory
Right-click to open process management, and right-click on the process management interface to close it.
Only the top fifteen processes that occupy the most memory will be displayed each time, and the process will be killed by clicking on it.
At the same time, for the sake of fun, I also set up single scores and achievements. When you reach 100 points, you can unlock the title of Blue Screen Witness. (dog head)
Project address: github.com/SSRemex/Mem…
Write at the end
This project is just for fun, do not use it in daily life for fear of problems.
Once again, the memory cleaning function has no effect on the system, because Windows’ own mechanism does not require memory cleaning at all. On the contrary, memory cleaning may cause some lag problems (because the data needs to be re-read).
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