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Author Message
  Topic: Computer Analyses Checking, Verification & Archiving
JohnCampbell

Replies: 2
Views: 79

PostForum: General   Posted: Sun Mar 24, 2019 9:01 am   Subject:
John S,

This could be such a broad topic.
I am interested in your description of working in a big stress office, where you may have attempted to define a standard approach to validation.
Where to ...
  Topic: Specific Forum 'Topic' Informing Users of dllxx Releases
JohnCampbell

Replies: 4
Views: 198

PostForum: Suggestions   Posted: Wed Mar 20, 2019 2:59 am   Subject:
I agree that a specific forum section for locating updates would be helpful for tracking adoption of more recent interim releases. It could possible be added into announcements with an appropriate ind ...
  Topic: Fortran 2003 and 2008 features
JohnCampbell

Replies: 22
Views: 2946

PostForum: Suggestions   Posted: Wed Mar 20, 2019 2:51 am   Subject:
Paul,

Thanks very much for this addition.
I shall be interested to test it when it is released.

This has the potential to simplify the code structure for resizing allocatable arrays.
It will b ...
  Topic: Clearwin videos
JohnCampbell

Replies: 7
Views: 178

PostForum: ClearWin+   Posted: Fri Mar 15, 2019 12:21 am   Subject:
You could try to install the FTN95 versions into different directories in C:\Program Files (x86)\Silverfrost, then by modifying the environment variables (in SYSTEM) you can switch between versions of ...
  Topic: Backing up
JohnCampbell

Replies: 8
Views: 235

PostForum: General   Posted: Fri Mar 15, 2019 12:11 am   Subject:
John S,
I am not familiar with "DAT" tape, but I do have a lot of old tape cassettes in boxes, which are now useless. I do have a tape cartridge from either an Apollo or Sun with informatio ...
  Topic: Backing up
JohnCampbell

Replies: 8
Views: 235

PostForum: General   Posted: Wed Mar 13, 2019 9:20 am   Subject:
Eddie,
My experience with backups has been similar, although my realisation moment that backups donít work came over 20 years ago when my (DOS) QIC tape backup would not (easily) run on an updated Wi ...
  Topic: Numerical difference Silverfrost v8 vs Salford 2.54
JohnCampbell

Replies: 22
Views: 501

PostForum: Support   Posted: Sat Mar 02, 2019 6:33 am   Subject:
I looked at your results, which are (disturbingly) only slightly different.

Did you use ftn95 /64 or ftn95 32-bit ?
32-bit will use x87 80-bit calculations, while I think 64-bit will use 64-bit ca ...
  Topic: Error in NINT(), 32-bit FTN95
JohnCampbell

Replies: 7
Views: 270

PostForum: Support   Posted: Sat Mar 02, 2019 6:06 am   Subject:
My modified code does now show that the problem is with x87 calculations program xttbl
implicit none
double precision ti, tr, co2, co3, r1, r2, r3
double precision e1, e2, ...
  Topic: Numerical difference Silverfrost v8 vs Salford 2.54
JohnCampbell

Replies: 22
Views: 501

PostForum: Support   Posted: Fri Mar 01, 2019 4:12 am   Subject:
It is interesting what we consider to be a compiler bug.

This accusation is often applied to a new compiler, because the previous compiler tolerated, what we accepted to be my "old" Fortr ...
  Topic: Numerical difference Silverfrost v8 vs Salford 2.54
JohnCampbell

Replies: 22
Views: 501

PostForum: Support   Posted: Fri Mar 01, 2019 3:11 am   Subject: Re:
... which if true is worrying.
Optimisation should only touch the efficiency of execution not accuracy of the results surely. Or am I missing something.

For floating point calculations, Optimisati ...
  Topic: Numerical difference Silverfrost v8 vs Salford 2.54
JohnCampbell

Replies: 22
Views: 501

PostForum: Support   Posted: Thu Feb 28, 2019 11:49 am   Subject:
If you are using Ver 8 32-bit, then both tests should be using x87 computation.
If they are different, then there may be different optimisation in place. (what compile options are you using)
You nee ...
  Topic: Error in NINT(), 32-bit FTN95
JohnCampbell

Replies: 7
Views: 270

PostForum: Support   Posted: Thu Feb 28, 2019 11:34 am   Subject:
I have reproduced the error using FTN95 Ver 8.4.0, although I am not sure the test proves there is something wrong.
I changed the example to attempt to print the input to NINT, although if the value ...
  Topic: Stack Size
JohnCampbell

Replies: 24
Views: 3408

PostForum: 64-bit   Posted: Wed Feb 20, 2019 8:01 am   Subject:
Paul,

Thanks very much for the stack command in SLINK64.
Please ensure it is documented in FTN95.chm

My preference would have been for something like "stack_size 16MB", rather than & ...
  Topic: use_virtual_scratch_files@ available for ftn95?
JohnCampbell

Replies: 4
Views: 238

PostForum: Support   Posted: Wed Feb 20, 2019 3:23 am   Subject:
As most disk I/O is now buffered, why worry about virtual files; disk files would probably give similar performance.
  Topic: Read and Write Performance
JohnCampbell

Replies: 17
Views: 690

PostForum: Support   Posted: Thu Jan 24, 2019 7:37 am   Subject: Re:
Soon many people will start asking why regular READ is so hell slow
Regular reads, especially text reads, can be limited by the processing rate of the I/O library routines. As I recall, my I/O librar ...
 
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