# Where can I download the files mentioned in "Improving I/O Performance...":? **URL:** \ **Category:** HDF5 Library\ **Created:** [April 21, 2026, 11:43pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768 "2026-04-21T23:43:59Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![furutaka.kazuyoshi](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/f/e5b9ba/32.png) [@furutaka.kazuyoshi](https://forum.hdfgroup.org/u/furutaka.kazuyoshi)\ **Post date:** [April 21, 2026, 11:43pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/1 "2026-04-21T23:43:59Z")
Hi, Where can I download the files mentioned as “[7]” > We will use two HDF5 files to compare I/O performance and to illustrate the issues users may encounter when working with compressed data. These HDF5 files and the application programs used to read them can be downloaded [7] by readers wishing to reproduce the performance results discussed in this paper.1 in a paper titled “[Improving I/O Performance When Working with HDF5 Compressed Datasets](https://support.hdfgroup.org/documentation/hdf5/latest/improve_compressed_perf.html)”? Thanks in advance, Kazuyoshi ---
**Author:** ![furutaka.kazuyoshi](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/f/e5b9ba/32.png) [@furutaka.kazuyoshi](https://forum.hdfgroup.org/u/furutaka.kazuyoshi)\ **Post date:** [April 21, 2026, 11:47pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/2 "2026-04-21T23:47:54Z")
> [@furutaka.kazuyoshi](#): > > “[Improving I/O Performance When Working with HDF5 Compressed Datasets](https://support.hdfgroup.org/documentation/hdf5/latest/improve_compressed_perf.html)” Well… I found [a pdf version of the page](https://support.hdfgroup.org/documentation/hdf5-docs/hdf5_topics/HDF5ImprovingIOPerformanceCompressedDatasets.pdf), but the link to [7] seems to be dead, orz. ![Screenshot From 2026-04-22 08-47-28](https://dbkt.hdfgroup.org/original/2X/d/dc91db39eb357728c6b14302e29b8c0a2a9c4ae1.png) ---
**Author:** ![furutaka.kazuyoshi](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/f/e5b9ba/32.png) [@furutaka.kazuyoshi](https://forum.hdfgroup.org/u/furutaka.kazuyoshi)\ **Post date:** [April 22, 2026, 12:58am UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/3 "2026-04-22T00:58:57Z")
> [@furutaka.kazuyoshi](#): > > in a paper titled “[Improving I/O Performance When Working with HDF5 Compressed Datasets](https://support.hdfgroup.org/documentation/hdf5/latest/improve_compressed_perf.html)”? The “Read Time” for `File_with_compression.h5` in “Table 1” should read **345** **seconds** instead of _0.37 seconds_? (according to the pdf version) ---
**Author:** ![hyoklee](https://forum.hdfgroup.org/user_avatar/forum.hdfgroup.org/hyoklee/32/1528_2.png) [@hyoklee](https://forum.hdfgroup.org/u/hyoklee)\ **Post date:** [April 22, 2026, 3:21pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/4 "2026-04-22T15:21:46Z")
Hi, Furutaka! To help our users who can’t easily locate documents from our website, I created a new PDF version of reference manual [1] that has almost everything - 4,323 pages. Do you mean “Table 5” on page 909 of [1]? If so, I uploaded the test file to MediaFire [2] because file size is 245MB. Our forum allows only max 9.8MB upload. Please let me know if the link doesn’t work. BTW, the paper was written in 2015. I hope you’ll get better & interesting performance results w/ the latest HDF5. Regards, [1] [https://hdfeos.org/help/reference/h5\_ref\_man\_t.pdf](https://hdfeos.org/help/reference/h5_ref_man_t.pdf) [2] [SCRIS\_npp\_d20140522\_t0754579\_e0802557\_b13293\_c20140522142425734814\_noaa\_pop](https://www.mediafire.com/file/b5ex8jrnicq8fwj/SCRIS_npp_d20140522_t0754579_e0802557_b13293_c20140522142425734814_noaa_pop.h5/file) ---
**Author:** ![furutaka.kazuyoshi](https://forum.hdfgroup.org/letter_avatar_proxy/v4/letter/f/e5b9ba/32.png) [@furutaka.kazuyoshi](https://forum.hdfgroup.org/u/furutaka.kazuyoshi)\ **Post date:** [April 22, 2026, 10:21pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/5 "2026-04-22T22:21:06Z")
Dear @hyoklee , Thanks for the Doxygen document and the link to the file. I’ll try to make good use of it. As for the file, it seems our institute does not allow to access to MediaFire, so I’ll try it from home. By the way, there appears many empty squares □ in the document; images may be missing? ![screenshot.26](https://dbkt.hdfgroup.org/original/2X/8/8a52cedab3ce7889d630bf165e0713e4c115b3a5.jpeg) And, > [@furutaka.kazuyoshi](#): > > The “Read Time” for `File_with_compression.h5` in “Table 1” should read **345** **seconds** instead of _0.37 seconds_? (according to the pdf version) also in the pdf (because of the same source). ```auto diff --git a/docs/doxygen/dox/HDF5ImprovingIOPerformanceCompressedDatasets.dox b/docs/doxygen/dox/HDF5ImprovingIOPerformanceCompressedDatasets.dox index 8d94184d29..2b263e98b5 100644 --- a/docs/doxygen/dox/HDF5ImprovingIOPerformanceCompressedDatasets.dox +++ b/docs/doxygen/dox/HDF5ImprovingIOPerformanceCompressedDatasets.dox @@ -205,7 +205,7 @@ * Table 1: Reading by 1x1x717 hyperslab (or “rows”) from original and compressed datasets. * Performance drops more than 3000 times. * File NameFile.h5File_with_compression.h5 (gzip level 6) - * Read Time0.1 seconds0.37 seconds + * Read Time0.1 seconds345 seconds * * * We experimented with the HDF5 parameters such cache size and chunk size and modified our ``` ---
**Author:** ![hyoklee](https://forum.hdfgroup.org/user_avatar/forum.hdfgroup.org/hyoklee/32/1528_2.png) [@hyoklee](https://forum.hdfgroup.org/u/hyoklee)\ **Post date:** [April 22, 2026, 10:50pm UTC](https://forum.hdfgroup.org/t/where-can-i-download-the-files-mentioned-in-improving-i-o-performance/13768/6 "2026-04-22T22:50:36Z")
Yes, the empty square is for images. If you need the images, you may try a bigger file size PDF version [3] although some images are still missing. Yes, I think the Doxygen version of “Table 1” has a bug. It should be **345** **seconds** to match the original PDF file. Please submit a ticket. Thank you so much for reviewing docs carefully! [3] [https://hdfeos.org/help/reference/h5\_ref\_man\_m.pdf](https://hdfeos.org/help/reference/h5_ref_man_m.pdf)