[Qt-interest] QtWebKit and memory usage

[Joel A. Iturra P.]

On Wed, Feb 18, 2009 at 7:51 PM, Rohan McGovern
<rohan.mcgovern at nokia.com> wrote:
> On Wednesday 18 February 2009, Joel A. Iturra P. wrote:
>> On Tue, Feb 17, 2009 at 8:06 PM, Rohan McGovern
>>
>> <rohan.mcgovern at nokia.com> wrote:
>> > On Wednesday 18 February 2009, Joel A. Iturra P. wrote:
>> >> [...]
>> >
>> > [...]
>> >
>>
>> If is not memory leak, how I can free memory ?
>
> I say it may not be a memory leak because I'm theorizing that memory
> would be reused if you were to reload the same webpage, or
> eventually reused if you reload the same webpage several times.
> That's why I asked the question about repeatedly reloading the same
> page.
>
> If repeatedly reloading the same page increases memory usage with no
> upper bound, it's a real leak.  A tool like valgrind should be able
> to give more information.

I'm reloading the same page using setUrl(QUrl). I don't know how use valgrind,
but I'll try to learn today.


>
>> [...]
>> Any idea what I'm doing wrong ?
>
> You're not necessarily doing anything wrong, the QtWebkit API simply
> doesn't provide any way to make Webkit free memory used by its
> custom allocator(s).
>
> Also, how are you determining "memory usage"?  (I should have asked
> this in my first mail).

using "top" on my Debian Linux


This view is few minutes after start

Mem:   2006812k total,   908100k used,  1098712k free,    20780k buffers
Swap:  1943824k total,            0k used,  1943824k free,   419548k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 7036 jiturra      20   0   135m  93m  19m S   77      4.8           0:21.85 tmp



15 minutes after

Mem:   2006812k total,  1957124k used,     49688k free,         776k buffers
Swap:  1943824k total,    305040k used,  1638784k free,   125080k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 7036 jiturra      20   0   1270m 1.1g  19m R   77        57.1       7:08.45 tmp


I will try with QWebFrame::load(QUrl), It seems a better method.

Thanks.



-- 
Joel A. Iturra
Santiago - Chile