Hi Werner, Thank you for testing. The bug is in the queue.
Elena On Feb 16, 2012, at 5:20 AM, Werner Benger wrote: > Hi Elena, > > I've tested it with version 1.8.9-snap10, and the behavior is still the > same, giving a > difference of about 386MB RAM usage in my application scenario, depending > on whether an H5Dclose() is done after H5Dread() or not, based on that > aforementioned 83MB file. > > Werner > > > On Wed, 15 Feb 2012 17:34:45 +0100, Elena Pourmal <[email protected]> > wrote: > > Hi Werner, > > It looks like a bug. I've just entered the issue into our database. > > When you have a chance, could you please try the latest 1.8.8 to confirm that > the issue is still there? > > Thank you! > Elena > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Elena Pourmal The HDF Group http://hdfgroup.org > 1800 So. Oak St., Suite 203, Champaign IL 61820 > 217.531.6112 > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > > > On Feb 15, 2012, at 7:18 AM, Werner Benger wrote: > >> Hi, >> >> I'm reading a file of size ~83MB consisting out of 6294 datasets, >> converting single precision data in the file to double precision in >> memory, so the memory occupancy would be about 145MB of all data loaded >> itself. However, once reading a dataset with H5Dread() I leave the >> data space identifier open, for further usage in case the same dataset >> needs to be read again later. This leads to some memory overhead of >> 388MB, which is twice as large as the data that is actually used in >> memory. When doing an H5Dclose() on the dataset identifier just after >> the H5Dread() call, this memory overhead does not appear. >> >> Is there a way to free this evidently HDF5-internal memory that is >> used when reading a dataset? I'd like to keep the dataset identifier >> available for further usage, but this memory overhead per read is >> killing memory performance. Calling >> >> H5garbage_collect(void) >> >> doesn't help. I'm using HDF5 version 1.8.4-snap17 , was there any >> change on such memory management behavior in more recent versions? >> >> >> Werner >> >> -- >> ___________________________________________________________________________ >> Dr. Werner Benger Visualization Research >> Laboratory for Creative Arts and Technology (LCAT) >> Center for Computation & Technology at Louisiana State University (CCT/LSU) >> 211 Johnston Hall, Baton Rouge, Louisiana 70803 >> Tel.: +1 225 578 4809 Fax.: +1 225 578-5362 > > > > > -- > ___________________________________________________________________________ > Dr. Werner Benger Visualization Research > Laboratory for Creative Arts and Technology (LCAT) > Center for Computation & Technology at Louisiana State University (CCT/LSU) > 211 Johnston Hall, Baton Rouge, Louisiana 70803 > Tel.: +1 225 578 4809 Fax.: +1 225 578-5362
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