[C400-L] Temporary storage, was Authentication / base64 encoder?

[Mel Rothman <mel@xxxxxxxxxxxxxx>]

Bruce,

You were right it failed on the 257th allocation.

In any case, 4G is a lot more than 16M, and should be sufficient for 
the majority of applications.

It also appears that the 4G limitation is a job attribute.  Once the 
failure occurred, I could not allocate any more space in the job and 
had to sign off to release the storage.

This problem went away when I created the program in ACTGRP(*NEW) 
instead of the DFTACTGRP.

When I used a named activation group, the problem came back but could 
be cleared by reclaiming the named activation group.

Mel Rothman
Mel Rothman, Inc.

Bruce Vining wrote:

> Change your array dimension to 500 and I suspect you'll see a failure
> around the 257th allocation.  Each language runtime could handle storage
> allocations in different manners, but I would expect most of them to fail
> in the neighborhood of 4GB.
>
> Bruce
>
>
>
>                                                                                                                                    
>                       Mel Rothman                                                                                                  
>                       <mel@xxxxxxxxxxxx        To:       C400-L@xxxxxxxxxxxx                                                       
>                       om>                      cc:                                                                                 
>                       Sent by:                 Subject:  [C400-L] Re: Authentication / base64 encoder?                             
>                       c400-l-bounces@mi                                                                                            
>                       drange.com                                                                                                   
>                                                                                                                                    
>                                                                                                                                    
>                       08/29/2003 10:26                                                                                             
>                       AM                                                                                                           
>                       Please respond to                                                                                            
>                       C programming                                                                                                
>                       iSeries / AS400                                                                                              
>                                                                                                                                    
>                                                                                                                                    
>
>
>
>
> Jon,
>
> I don't know where RPG allocates storage from (you said "from the
> default heap which has 1 16M limit"), but I just ran a test that
> indicates RPG dynamic storage is not limited to only 1 16 megabyte
> piece of storage.
>
> Below is the code and it had no problems allocating 16,000,000 bytes
> to each of 50 pointers.
>
> Am I missing or misunderstanding something?
>
> Did you mean to say 16M per pointer?
>
> Mel Rothman
> Mel Rothman, Inc.
>
> D ptrs            s               *   dim(50)
> D i               s             10i 0
> C                   for       i = 1 to %elem(ptrs)
> C                   alloc     16000000      ptrs(i)
> C                   endfor
> C                   eval      *inlr = *on
>
>
>
> Jon Paris wrote:
>
> > >> But what I'd really like to know - is there any reason for OS/400 to
> > return NULL after calling for example r = (char *) malloc(1000000) ;
> >
> > The major reason would be that you've exhausted the heap space (or at
>
> least
>
> > there no contiguous space of 1,000,000 bytes available).  I'm not certain
> > about C, but RPG allocates form the default heap which has 1 16M limit.
> > Unless you specify that the C code is to use terraspace capability then I
> > suspect it has the same limit.  If you are using small amounts of memory
>
> I
>
> > wouldn't bother about it - if you're using 1,000,000 byte requests then
> > probably safer to use the CEE APIs and create your own custom heap.
> >
> > Jon Paris
> > Partner400
> > www.Partner400.com
> >
> > _______________________________________________
>
>
>
> _______________________________________________
> This is the C programming iSeries / AS400 (C400-L) mailing list
> To post a message email: C400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/c400-l
> or email: C400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/c400-l.
>
>
>
>
> _______________________________________________
> This is the C programming iSeries / AS400 (C400-L) mailing list
> To post a message email: C400-L@xxxxxxxxxxxx
> To subscribe, unsubscribe, or change list options,
> visit: http://lists.midrange.com/mailman/listinfo/c400-l
> or email: C400-L-request@xxxxxxxxxxxx
> Before posting, please take a moment to review the archives
> at http://archive.midrange.com/c400-l.