[PyQt] Attempting to reduce the memory footprint of my PyQt5 application

[Kovid Goyal]

I cannot reproduce via a timer either, script is:

import psutil
import subprocess
import time
import gc
import os
import threading

p = psutil.Process(os.getpid())
print(p.memory_info())

def f():
    subprocess.check_output('true')
    gc.collect(), gc.collect(), gc.collect()
    print(p.memory_info())
    threading.Timer(1, f, ()).start()

f()
input()

Output is:

pmem(rss=11374592, vms=58744832, shared=4669440, text=4096, lib=0, data=7122944, dirty=0)
pmem(rss=11931648, vms=58892288, shared=4993024, text=4096, lib=0, data=7270400, dirty=0)
pmem(rss=11960320, vms=134393856, shared=4993024, text=4096, lib=0, data=15794176, dirty=0)
pmem(rss=14303232, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)
pmem(rss=12242944, vms=212086784, shared=5210112, text=4096, lib=0, data=24322048, dirty=0)

And before you ask, I verified that memory usage was constant using top
as well.

Kovid.

On Thu, Sep 15, 2016 at 06:11:02PM +1000, Xavion wrote:
> I've just updated the ticket <http://bugs.python.org/issue28165> I created
> on the Python bug tracker earlier.  My most recent post lists the code
> fragment I'm using (i.e. via a timer, not a loop).  The one before that
> details how I'm going about monitoring the memory (i.e. from a Bash script).
> 
> I just incorporated your three "gc.collect()" calls and it made no
> difference.  Starting the processes from the main event loop (rather than
> in a QThread) didn't help either.  Everything was fine with the QThread
> anyway: disabling the process call kept the memory constant.
> 
> I'll have a go at using Valgrind tomorrow.
> 
> Thanks again for all of your help, guys.

> _______________________________________________
> PyQt mailing list    PyQt at riverbankcomputing.com
> https://www.riverbankcomputing.com/mailman/listinfo/pyqt


-- 
_____________________________________

Dr. Kovid Goyal 
http://www.kovidgoyal.net
http://calibre-ebook.com
_____________________________________