Poor performance when using Texas Instruments code generation
tools in Wine
mstefani at redhat.com
Tue Feb 22 06:16:47 CST 2005
Anders Rønningen wrote:
> Hi !
> We have some performance problems with Wine that we could use some help
> Here's the story:
> We have been using TI code generation tools (compiler and linker) on
> Wine, and it has worked well. However, when we started evaluating newer
> versions of the codegen tools, the linking time was dramatically
> increased (from 20 sec to 30 minutes...).
> We have done some profiling using oprofile, and found that most of this
> time (96%) is spent in the HEAP_FindFreeBlock* *function in the ntdll
> module. The time needed to locate a free heap block increases gradually,
> from a few iterations up to about 15000 in the project we are building.
> We suspect that this may be due to fragmentation caused by the heap
> allocate/free algorithms.
> We do not have the same problem when building the code under Windows, so
> we tried to use the native ntdll.dll from Windows instead of
> ntdll.dll.so, hoping that this would solve the performance issue. We are
> aware that this is not recommended, but wanted to give it a try anyway.
> We added the dll file to the global dll-override section in the config
> file under ~/.wine/config, but it seems like Wine just looks for the
> builtin dll. We see from strace that we access the correct config file
> at startup. Is override of ntdll not supported, or have we missed
> something? If it is supported, is it likely that it is going to work?
ntdll is one of the DLLs which will never be able to be used in Wine. So
Wine ignores any dll-override line for it.
> We have read some posts in the newsgroup about the heap issues. It seems
> that people agree that the heap should be improved, either by tweaking
> the existing code, or by using another heap implementation. Is any work
> planned on this?
Not that i know off. The Linux kernel VM is a good place to get ideas
how to limit memory fragmentation.
Michael Stefaniuc Tel.: +49-711-96437-199
Sr. Network Engineer Fax.: +49-711-96437-111
Red Hat GmbH Email: mstefani at redhat.com
Hauptstaetterstr. 58 http://www.redhat.de/
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