QtSerialPort and memory usage

mrjj

Hmm if tera works with same usb serial then it cant be the driver.
Im also using serial over usb.

Tried to run updated code. just to ebe sure.
get link error
undefined reference to `GetProcessMemoryInfo@12'

What should i put in .pro to run ?
something with -lpsapi.
Mostly on linux so not sure with syntax

codeaway

@mrjj

Yes.

Sorry, missed the .pro file. inlined it

#-------------------------------------------------

Project created by QtCreator 2015-10-06T21:35:43

#-------------------------------------------------

win32:LIBS += -lpsapi

QT += core serialport

QT -= gui

TARGET = Serial
CONFIG += console
CONFIG -= app_bundle

TEMPLATE = app

SOURCES += main.cpp

mrjj

works.
Still stable.
Do you have input on the serial ?
I will connect something that sends data. just to check.
How do you make it open console also ?
Here its just a process.
Update:
ignore last question. just saw its QDebug
Also, with input , I do see mem raising.
Testing more

mrjj

ok,
slowly from 12k to 17k. over time when it has input.
Also the pmc changes.
So yes. I see the same.
Will leave it running for some time to check if it stops.

codeaway

@mrjj

Yes, I do have a microcontroller reading values and outputting to serial port
continuously.

Actually, the application I created is a console application. The info is output
with QDebug additionally.

Nevertheless, you can choose to output with console without QDebug too.

CONFIG += console

in the .pro file

Create a output stream in the actual code

QTextStream out(stdout);

and output whatever required

out << "Something" << endl;

mrjj

@codeaway
Ok i killed it at 25K.
Since we just reading a char, it cant be in the us that leaks.

I must agree it seems odd.

kuzulis

Can you please test same with the virtual com0com: http://sourceforge.net/projects/com0com/
A signed driver for x64: https://code.google.com/p/powersdr-iq/downloads/detail?name=setup_com0com_W7_x64_signed.exe&can=2&q=

codeaway

@kuzulis

I downloaded the x86 build, as I am running a 32 bit OS.
How should I configure com0com ?

mrjj

@kuzulis
just as a virtual port or as a loop ?

kuzulis

How should I configure com0com ?

Just create a pair with the "use port class" and "eneble buffer overrun" (via setupg.exe ui)

just as a virtual port or as a loop ?

as a two virtual ports. . e.g. COM1 as receiver for qserialport and COM2 as sender for other software (e.g. I have used Termite app to send).

UPD:

Yes, I too can reproduce this memory leak..

codeaway

@kuzulis

Yeah, reproduced it with com0com and termite.
Attached link to screencap

http://postimg.org/image/mku4ege29/

After a detailed analysis, it looks as though all QtSerialPort examples
also face this issue.

mrjj

@codeaway
Yep got ever increasing mem use also with com0com.
If time permits I try the examples too.

kuzulis

Probably it is a bug of QWinOverlappedIoNotifier : https://bugreports.qt.io/browse/QTBUG-48653
Let's wait for more info about..