Re: Solaris memory usage
3.76GB is the number I've seen (and used) for Solaris 32bit. cheers j. -.-- --- ..- / -. . . -.. / - --- / --. . - / .- / .-.. .. ..-. . .-.-.- / ... --- / -.. --- / .. .-.-.- ----- Original Message ----- From: "Art S. Kagel" <kagel@bloomberg.net> To: <informix-list@iiug.org> Sent: Friday, December 19, 2003 9:37 AM Subject: Re: Solaris memory usage > On Fri, 19 Dec 2003 05:08:44 -0500, Dirk Moolman wrote: > > IB the largest contiguous block is 4GB. Sun will let a 32bit application > attach to about 3.2GB of shared memory segments. It will allow a 64bit app to > attach to about 15.6GB of shared memory segments. > > Art S. Kagel > > > Can anyone tell me how much contiguous memory Solaris will allow Informix to > > use ? (Solaris 8, IDS 7.31 FD3) > > > > > > I remember a couple of years ago, working on AIX there was a limit on the > > memory usage, and memory in Unix would be split, which impacted on > > performance. > > > > Is this also the case in Solaris, what is the limit and are there any fixes > > like AIX had ? (they had a parameter that could be set to use more memory). > > > > > > > > > > > > Dirk Moolman > > Database and Unix Administrator > > MXGROUP > > > > > > Learn from the mistakes of others. You won't live long enough to make all of > > them yourself. > > > > > > sending to informix-list > sending to informix-list
On Fri, 19 Dec 2003 13:34:03 -0500, Jack Parker wrote: OK, recoded my test program. If I try to get large segments (1MB or larger) than the most I can attach to concurrently is 3.7626GB. If I'm willing to create smaller segments (down to 4 bytes) I can attach 3.9232GB. It seems to be an address space problem. The OS cannot find any free address range blocks big enough to map the next segment into. The test program trys to allocate then attach segments of a given size. No allocation fails, but eventually an attach fails. When that happens the program divides the segment size in half and tries again continuing until the segment size is 2 bytes long. Test run on Solaris 8 starting at 32MB (32 * 1024^2) I can attach to: Size #segments -------- ----------- 32MB 113 16MB 0 8MB 1 4MB 0 2MB 114 1MB 1 512KB 114 256KB 345 128KB 1 64KB 334 etc. Total attached: 4212523008bytes (3.9232 * 1024^3). FWIW. Art S. Kagel > 3.76GB is the number I've seen (and used) for Solaris 32bit. > > cheers > j. > -.-- --- ..- / -. . . -.. / - --- / --. . - / .- / .-.. .. ..-. . .-.-.- / ... > --- / -.. --- / .. .-.-.- > ----- Original Message ----- > From: "Art S. Kagel" <kagel@bloomberg.net> To: <informix-list@iiug.org> Sent: > Friday, December 19, 2003 9:37 AM > Subject: Re: Solaris memory usage > > >> On Fri, 19 Dec 2003 05:08:44 -0500, Dirk Moolman wrote: >> >> IB the largest contiguous block is 4GB. Sun will let a 32bit application >> attach to about 3.2GB of shared memory segments. It will allow a 64bit > app to >> attach to about 15.6GB of shared memory segments. >> >> Art S. Kagel >> >> > Can anyone tell me how much contiguous memory Solaris will allow > Informix to >> > use ? (Solaris 8, IDS 7.31 FD3) >> > >> > >> > I remember a couple of years ago, working on AIX there was a limit on > the >> > memory usage, and memory in Unix would be split, which impacted on >> > performance. >> > >> > Is this also the case in Solaris, what is the limit and are there any > fixes >> > like AIX had ? (they had a parameter that could be set to use more > memory). >> > >> > >> > >> > >> > >> > Dirk Moolman >> > Database and Unix Administrator >> > MXGROUP >> > >> > >> > Learn from the mistakes of others. You won't live long enough to make > all of >> > them yourself. >> > >> > >> > sending to informix-list >> >> >> > sending to informix-list