Hello everyone!
I configure HDF5 build with command:
cmake -G "Visual Studio 12" -DBUILD_SHARED_LIBS=ON
-DCMAKE_BUILD_TYPE=Release -DHDF5_ENABLE_Z_LIB_SUPPORT=ON
-DHDF5_ALLOW_EXTERNAL_SUPPORT=SVN
-DZLIB_SVN_URL=http://svn.hdfgroup.uiuc.edu/zlib/trunk
-DHDF5_ENABLE_THREADSAFE=ON hdf5-1.8.14
Then I compile and run the following minimal (Delphi) program, which
emulates multiple hdf5.dll dynamic load-use-unload pattern:
program test;
uses
windows;
type
herr_t = Integer;
var
Dll: HMODULE;
H5open: function: herr_t; cdecl;
H5close: function: herr_t; cdecl;
begin
while True do
begin
Dll := LoadLibrary('hdf5.dll');
try
@H5open := GetProcAddress(Dll, 'H5open');
@H5close := GetProcAddress(Dll, 'H5close');
H5open();
H5close();
finally
FreeLibrary(Dll);
end;
end;
end.
When I run the above program for some time, I see memory usage
constantly growing (~1MB per minute).
The problem is reproducible with HDF5 1.8.13, but not reproducible when
I configure with -DHDF5_ENABLE_THREADSAFE=OFF or use stock HDF5 binaries.
Albeit my minimal program is pathological, it illustrates real-life
usage pattern (imagine long-running server application). Also, the
presence of even minimal memory leaks in HDF5 complicates memory leak
profiling for the whole application.
Is it a known problem?
Is there additional info I should provide for you to help localize and
eliminate the problem?
Best wishes,
Andrey Paramonov
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