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Has Intel Fortran Compiler 8.1 SLOW READ problem been fixed in 9.0?

yood
Beginner
‎02-17-2006 09:16 PM
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Hi,
Last year we purchased the Intel Fortran 8.1 Fortran compiler for the Itanium-2 64-bit platform. We were surprised and dismayed to learn that the code generated would actually perform worse than our 32-bit Fortran code. We traced the problem to reads from disk. After a lengthy exchange with Intel's technical support (spanning months) we finally got them to admit that this was the case. The reason given was that development/poor performing I/O libraries were linked into the 8.1 release version. Since no update or patch was to be produced they finally indicated that we could havea refund.
Now our project is at a point where we need to know if the slow read problem has been fixed with the 9.0 release version. Is there anyone out there who has any input into this subject one way or the other? It would be great if Intel tech support could verify it.
Thankx much,
Mark
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Steven_L_Intel1
Employee
‎02-17-2006 10:01 PM
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Mark,

The issue you reported (#277864) was indeed fixed in 9.0. It wasn't actually the file read, but conversion from text to binary for formatted input that was the problem.

You may find that the /assume:buffered_io option gives you further performance improvement.

Message Edited by Steve_Lionel on 02-17-2006 05:04 PM

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Community support is provided Monday to Friday. Other contact methods are available here.

Intel does not verify all solutions, including but not limited to any file transfers that may appear in this community. Accordingly, Intel disclaims all express and implied warranties, including without limitation, the implied warranties of merchantability, fitness for a particular purpose, and non-infringement, as well as any warranty arising from course of performance, course of dealing, or usage in trade.

For more complete information about compiler optimizations, see our Optimization Notice.