How to use QNetworkAccessManager without leaking memory.
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@Q139 said in How to use QNetworkAccessManager without leaking memory.:
qnam=new QNetworkAccessManager;
Why do you create QNetworkAccessManager instance for each request? One can handle many requests...
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You never reset qnamUses. Therefore after 51 requests, you recreate your qnam object for every request.
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I still get leak.
Could you check if application output gives SSL error while connecting to https site?
I also had to install openSSL in addition to get it working, maybe it is related to that.
And while tested on ubuntu got no leak , but it had SSL errors in app output.
Got SSL for win7 and win10 from here, the lite edition, maybe that component causes problems.@Q139 said in How to use QNetworkAccessManager without leaking memory.:
I still get leak.
The Task manager is no tool to measure a memory leak!
Is there a way to use single instance of QNetworkAccessManager for 10k+ times without drastic memory usage growth?
Yes, simply use it.
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@Q139 said in How to use QNetworkAccessManager without leaking memory.:
I still get leak.
The Task manager is no tool to measure a memory leak!
Is there a way to use single instance of QNetworkAccessManager for 10k+ times without drastic memory usage growth?
Yes, simply use it.
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@Christian-Ehrlicher It ends with app filling memory and crashing if simply using.
@Q139 I still don't have a valid reproducer for this behavior...
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@Q139 I still don't have a valid reproducer for this behavior...
@Christian-Ehrlicher I tryed and it leaks on win 7 in vmware and win 10 native.
What version of Qt are you running? Did you also intall the openSSL?This produces problem in my tests. Only solution i find is to delete QNetworkAccessManager after some period and recreate it.
@Q139 said in How to use QNetworkAccessManager without leaking memory.:Install openSSL on Windows 7 or 10 and see if the app below leaks memory.
Windows ssl libraries site
direct link to download-Win64 OpenSSL v1.1.1g Light -
@Q139 said in How to use QNetworkAccessManager without leaking memory.:
Did you also intall the openSSL?
No need for ssl at all since your url ist http.
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´Please update the wait time between two requests to 100ms and see if the problem still persists. Looks like there is a race condition when the same url is queried very fast. But can't see the main reason for it currently.
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@Christian-Ehrlicher said in How to use QNetworkAccessManager without leaking memory.:
´Please update the wait time between two requests to 100ms and see if the problem still persists. Looks like there is a race condition when the same url is queried very fast. But can't see the main reason for it currently.
Hi, we meet this bug on site. is this bug fixed in the newer versions?
