[Libreoffice-bugs] [Bug 119591] MacOS: Memory isn't released to the initial state when closing a file after saving

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=119591

Alex Thurgood <iplaw67 at tuta.io> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever confirmed|0                           |1

--- Comment #1 from Alex Thurgood <iplaw67 at tuta.io> ---
Hmm, my experimentation so far just shows LO consuming more and more memory to
the point where my system becomes unresponsive requiring a force kill of the LO
process.

I loaded LOdev master into Instruments.app and then followed memory allocations
(until both LO and Insruments became unresponsive).

Once the document is loaded, transient memory allocation is running at 10 Gb.
I made a single digit change to one value without a comment in one cell, and
then attempted a re-save.

Instruments shows that memory allocation goes through the roof, passing from
10Gb transient to 85Gb transient memory, at which point my whole system becomes
unresponsive. Both LO and Instruments grind to a halt.

The memory guzzlers in this seem to be a combination of:

- rtl_UString_new_WithLength : only 1.5kb each, but a gazillion of them 

- rtl_Ustring_ImplAlloc(int) : quite a few of these too at 416 bytes a throw

This block is pointed to in strtmpl.cxx (1139-1157) 

IMPL_RTL_STRINGDATA* IMPL_RTL_STRINGNAME( ImplAlloc )( sal_Int32 nLen )
{
    IMPL_RTL_STRINGDATA * pData
        = (sal::static_int_cast< sal_uInt32 >(nLen)
           <= ((SAL_MAX_UINT32 - sizeof (IMPL_RTL_STRINGDATA))
               / sizeof (IMPL_RTL_STRCODE)))
        ? static_cast<IMPL_RTL_STRINGDATA *>(rtl_allocateString(
            sizeof (IMPL_RTL_STRINGDATA) + nLen * sizeof (IMPL_RTL_STRCODE)))
        : nullptr;




- I also see loads of calls to SfxItemSet::SfxItemSet(SfxItemSet const&),
allegedly from itemset.cxx, but a search in itemset.cxx doesn't return any such
line...

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