[Webkit-unassigned] [Bug 30331] New: Page with a form, five multi-line fields, large strings, Webkit RSIZE grows and grows

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=30331

           Summary: Page with a form, five multi-line fields, large
                    strings, Webkit RSIZE grows and grows
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Forms
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: joswig at lisp.de


Hi,

I am using Webkit, a nightly build. The process listing systems says 'Safari'
(does it then really use Safari?).

As an debugging example I have written a page with form which has five
multi-line fields and a submit button. The fields have a default content of
random strings of about 2 million characters each. So the page size is roughly
five * 2 million characters. This is also the size on disk, if I save the form
from the browser. The form page is dynamically generated by the server (no
static text file). Transfer is HTTP 1.1.

After about ten submissions of this form the memory footprint of Webkit goes in
the direction of 1 GB and still grows. Both virtual and physical memory
allocations of Webkit are in that range (the allocated physical memory is only
a little smaller). My Macbook Pro (3 GB RAM, Mac OS X 10.6.1) eventually starts
swapping and gets very slow during swapping.

I don't know if the memory ever gets freed, from what I see the memory size of
Webkit grows and grows. But even if it gets freed in some distant future, I
would then prefer Webkit to release memory much more aggressively. So either
this is a memory leak, or Webkit is not freeing/reusing memory early enough.

The page is about ten MB in size, submitting it ten times should not bring the
Webkit memory usage into the 1 GB RAM range.

If somebody would like to have a look at it, I'd be happy to setup an example
page.

                            PID        COMMAND      %CPU TIME     #TH  #WQ 
#PORT #MREG RPRVT  RSHRD  RSIZE  VPRVT  VSIZE 

 0 submissions  66046  Safari                0.2   00:01.51 9    2    130   334
  28M+   23M                  67M+   203M   4858M   
 1 submission    66046  Safari              12.8  00:17.57 9    2    136-  433 
 306M-  24M               413M     513M   5289M 
 2 submissions  66046  Safari              14.1 00:33.96 9    2    139   475  
429M   24M                   591M     647M   5473M
 3 submissions  66046  Safari                1.6  00:50.48 10   3    145+  505 
 454M   24M               719M-   762M   5604M 

...

You can see that RSIZE is after three form submissions already at 719M.

Regards,

Rainer Joswig

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