Shared memory parameters question

I have an ESQL/C application connected to Informix via shared memory. When it tries to malloc() more than about 8 MB, the malloc fails. I'm using SHMBASE 0x50000000 in the onconfig.ows file, which seems like it should be plenty high. The client program does putenv("INFORMIXSHMBASE 1310720"); (this value is 0x50000000/1024); however, this doesn't seem to make any difference; is it relevant? The server is INFORMIX-OnLine Version 7.20.UC4 on SunOS 5.6 running on a SPARC. Any ideas how I can solve this problem? Please reply to me by email. Thanks! David Anderson anderson@surf.com

David Anderson wrote: > I have an ESQL/C application connected to Informix via shared memory. > When it tries to malloc() more than about 8 MB, the malloc fails. > I'm using > > SHMBASE 0x50000000> > in the onconfig.ows file, which seems like it should be plenty high. > The client program does > putenv("INFORMIXSHMBASE 1310720"); > (this value is 0x50000000/1024); however, this doesn't seem to > make any difference; is it relevant? Well, I wouldn't think the putenv would have any effect. I think that if you want to set INFORMIXSHMBASE, you'll have to set it before you start the application. Once you've started running, it's already set. Try setting INFORMIXSHMBASE (to something higher) in your environment before starting the app, and see if that makes a difference. June -- june_t@hotmail.com Grounded in Palo Alto, living on M&M's (plain)

June Tong wrote: > David Anderson wrote: > > I have an ESQL/C application connected to Informix via shared > > memory. When it tries to malloc() more than about 8 MB, the > > malloc fails. I'm using > > > > SHMBASE 0x50000000> > > > in the onconfig.ows file, which seems like it should be plenty high. > > The client program does > > putenv("INFORMIXSHMBASE 1310720"); > > (this value is 0x50000000/1024); however, this doesn't seem to > > make any difference; is it relevant? > > Well, I wouldn't think the putenv would have any effect. If it is set before any database operations occur, it should be OK -- provided you set the environment correctly. The notation shown is wrong; you need to use: putenv("INFORMIXSHMBASE=1310720"); That equals sign is critical -- maybe you shouldn't use C Shell so much because that does not use the '=' in the setenv command, but puts it into the value actually in the environment. > I think that if you want to set INFORMIXSHMBASE, you'll have to > set it before you start the application. This is safer, but not necessary as long as the putenv() call is before the first database operation. > Once you've started running, it's already set. Try setting > INFORMIXSHMBASE (to something higher) in your environment before > starting the app, and see if that makes a difference. I'm not sure that it is a good idea to set the SHMBASE parameter in the ONCONFIG file to the same value as INFORMIXSHMBASE. They are referring to two different types of shared memory, and setting them to the same value may confuse things. -- Jonathan Leffler (jleffler@informix.com, jleffler@earthlink.net) Guardian of DBD::Informix v0.60 -- see http://www.perl.com/CPAN #include <disclaimer.h>

On 7 Jan 1999 23:34:40 GMT, anderson@ICSI.Berkeley.EDU (David Anderson) wrote: I had exactly the same problem and tried to change SHMBASE in onconfig.ows (and restarting online) with exactly same result. It must be a bug in Informix shared memory client. I had to switch to TCP-IP and everything worked perfectly. On HPUX the same version of client worked perfectly with shared memory. It seems to me unaccaptable and dangerous that you have to hardcode shared memory location for client server code communication and malloc can allocate exactly up to 8 Mbytes. >I have an ESQL/C application connected to Informix via shared memory. >When it tries to malloc() more than about 8 MB, the malloc fails. >I'm using > >SHMBASE 0x50000000> >in the onconfig.ows file, which seems like it should be plenty high. >The client program does >putenv("INFORMIXSHMBASE 1310720"); >(this value is 0x50000000/1024); however, this doesn't seem to >make any difference; is it relevant? > >The server is INFORMIX-OnLine Version 7.20.UC4 >on SunOS 5.6 running on a SPARC. > >Any ideas how I can solve this problem? >Please reply to me by email. Thanks! > > >David Anderson >anderson@surf.com

You have not give us information about wich operating sistem you are using. But I recommed you to read the release notes in the release directory. Usually there are a operating system configuration you should put in your O.S. files. This configuration tips are in the ONLINE_* file Hope this helps. Vicente Salvador DEISTER, S.A. (Spain) David Anderson wrote: > I have an ESQL/C application connected to Informix via shared memory. > When it tries to malloc() more than about 8 MB, the malloc fails. > I'm using > > SHMBASE 0x50000000> > in the onconfig.ows file, which seems like it should be plenty high. > The client program does > putenv("INFORMIXSHMBASE 1310720"); > (this value is 0x50000000/1024); however, this doesn't seem to > make any difference; is it relevant? > > The server is INFORMIX-OnLine Version 7.20.UC4 > on SunOS 5.6 running on a SPARC. > > Any ideas how I can solve this problem? > Please reply to me by email. Thanks! > > David Anderson > anderson@surf.com

In article <36A1DEF7.876B9549@deistersoft.com>, V.Salvador <nospam_vsalv ador@deistersoft.com> writes >You have not give us information about wich operating sistem you are ^^^^^^^^^^^^^^^^ >using. But I recommed you to read the release notes in the release >directory. Usually there are a operating system configuration you should >put in your O.S. files. > >This configuration tips are in the ONLINE_* file > >Hope this helps. > >Vicente Salvador >DEISTER, S.A. (Spain) > >David Anderson wrote: > >> I have an ESQL/C application connected to Informix via shared memory. >> When it tries to malloc() more than about 8 MB, the malloc fails. >> I'm using >> >> SHMBASE 0x50000000>> >> in the onconfig.ows file, which seems like it should be plenty high. >> The client program does >> putenv("INFORMIXSHMBASE 1310720"); >> (this value is 0x50000000/1024); however, this doesn't seem to >> make any difference; is it relevant? >> >> The server is INFORMIX-OnLine Version 7.20.UC4 >> > on SunOS 5.6 running on a SPARC. ^^^^^^^^^ >> >> Any ideas how I can solve this problem? Remove the putenv, you should never use putenv for Informix environment variables. Also check the release notes. Also I think it may be a known problem, talk to Informix Support I thought I've heard about this problem before.. >> Please reply to me by email. Thanks! >> >> David Anderson >> anderson@surf.com > -- David Williams