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Memory leak in IDL hdf5 library? [message #74508]

Tue, 18 January 2011 11:07

Eddie Schlafly
Messages: 5
Registered: January 2011

Junior Member

I think I've found a memory leak in the IDL hdf5 library and I wanted to
know if anyone knows what I'm doing wrong or what is going on. I've
appended some code that leaks memory based on the IDL hdf5 example code.

I modified the example ex_create_hdf5 routine to write a structure
containing an array of structures; if the number of elements in this
array is greater than 1, I see a memory leak.

Running:
ex_create_hdf5 & for i=0l,10 do ex_read_hdf5
causes the amount of memory allocated to IDL according to "top" to
increase by ~700 MB every time the line is run, despite the fact that the
written file is only about 40 KB.

IDL's
help, /memory
does not change and gives no indication that hundreds of MB of memory are
being used by IDL. Likewise,
help, /heap
shows no pointers or objects.

I am running:
help, !version, /st
** Structure !VERSION, 8 tags, length=104, data length=100:
ARCH STRING 'x86_64'
OS STRING 'linux'
OS_FAMILY STRING 'unix'
OS_NAME STRING 'linux'
RELEASE STRING '7.1.1'
BUILD_DATE STRING 'Aug 21 2009'
MEMORY_BITS INT 64
FILE_OFFSET_BITS
INT 64

Any hints as to what is going on?

Thanks for your help,

Eddie Schlafly

--

PRO ex_create_hdf5

file = 'hdf5_test.h5'
fid = H5F_CREATE(file)

;; create data
data0 = { a:replicate({b:0},2) }
data = replicate(data0, 10000)

;; get data type and space, needed to create the dataset
datatype_id = H5T_IDL_CREATE(data)
dataspace_id = H5S_CREATE_SIMPLE(size(data,/DIMENSIONS))

;; create dataset in the output file
dataset_id = H5D_CREATE(fid,$
'Sample data',datatype_id,dataspace_id)
;; write data to dataset
H5D_WRITE,dataset_id,data

;; close all open identifiers
H5D_CLOSE,dataset_id
H5S_CLOSE,dataspace_id
H5T_CLOSE,datatype_id
H5F_CLOSE,fid

END

PRO ex_read_hdf5

; Open the HDF5 file.
file = 'hdf5_test.h5'
file_id = H5F_OPEN(file)

; Open the image dataset within the file.
; This is located within the /images group.
; We could also have used H5G_OPEN to open up the group first.
dataset_id1 = H5D_OPEN(file_id, 'Sample data')

; Read in the actual image data.
image = H5D_READ(dataset_id1)

; Close all our identifiers so we don't leak resources.
H5D_CLOSE, dataset_id1
H5F_CLOSE, file_id

END

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[Message index]

		Memory leak in IDL hdf5 library? By: Eddie Schlafly on Tue, 18 January 2011 11:07
		Re: Memory leak in IDL hdf5 library? By: Alain Kattnig on Tue, 25 January 2011 00:52
		Re: Memory leak in IDL hdf5 library? By: Eddie Schlafly on Mon, 31 January 2011 15:43
		Re: Memory leak in IDL hdf5 library? By: Eddie Schlafly on Mon, 24 January 2011 16:43
		Re: Memory leak in IDL hdf5 library? By: David Fanning on Mon, 24 January 2011 13:08
		Re: Memory leak in IDL hdf5 library? By: Eddie Schlafly on Mon, 24 January 2011 12:50
		Re: Memory leak in IDL hdf5 library? By: David Fanning on Mon, 24 January 2011 11:45
		Re: Memory leak in IDL hdf5 library? By: Eddie Schlafly on Mon, 24 January 2011 11:13
		Re: Memory leak in IDL hdf5 library? By: Alain Kattnig on Tue, 01 February 2011 02:12

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