Does turning on teraspace, significantly effect performance of a C program
or the system for that matter,

Steve

Thanks, Elvis and Duane.

I was just reading the same page of that manual. I have turned on the
teraspace option and now the malloc succeeds.

-Marty

-----Original Message-----
From:
c400-l-bounces+marty_urbanek@ríè]?öÍu:+TÜRvZoÃ??cá
È
[mailto:c400-l-bounces+marty_urbanek@ríè]?öÍu:+TÜRvZoÃ??cá
È]
On
Behalf Of Christen, Duane J.
Sent: Thursday, September 06, 2007 1:33 PM
To: 'C programming iSeries / AS400'
Subject: Re: [C400-L] malloc fails

16MB is the limit for malloc.

From the C Runtime Functions Manual:
http://publib.boulder.ibm.com/infocenter/iseries/v5r4/topic/books/sc4156
07.p
df



13malloc() - Reserve Storage Block Format #include <stdlib.h> void
*malloc(size_t size); Language Level: ANSI Threadsafe: Yes. Description
The
malloc() function reserves a block of storage of size bytes. Unlike the
calloc() function, malloc() does not initialize all elements to 0. The
maximum size for a non-Teraspace malloc() is 16711568 byes.
Notes: 1. To use Teraspace storage instead of heap storage without
changing the C source code, specify the TERASPACE(*YES *TSIFC) parameter
on the CRTCMOD compiler command. This maps the malloc() library function
to _C_TS_malloc(), its Teraspace storage counterpart. The maximum amount
of Teraspace storage that can be allocated by each call to
_C_TS_malloc() is 2GB - 224, or 2147483424 bytes. If more than
2147483408 bytes are needed on a single request, call
_C_TS_malloc64(unsigned long long int);. For more information, see the
ILE Concepts manual.


Duane

-----Original Message-----
From:
c400-l-bounces+dchristen@? tÂn
[mailto:c400-l-bounces+dchristen@? tÂn
Behalf Of
Urbanek, Marty
Sent: Thursday, September 06, 2007 12:26 PM
To: c400-l@xxxxxxxxxxxx
Subject: [C400-L] malloc fails


I have a C/400 program trying to do a malloc for approx. 45MB but
malloc is returning null. No system messages appear in the joblog or
on QSYSOPR. The program works with smaller allocations.

Where is this limit controlled and how can it be increased?

Thanks,
-Marty

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