[PERFORM] How much memory in 32 bits Architecture to Shared Buffers is Possible
Hi, to all! Recently i try increasing the memory values of shared buffers on one IBM xseries 255 (Quad XEON 2.8, 8 GB RAM, 2 disk SCSI 36 GB(Raid 1), 1 Storage. I try change these shared memory values to use 25% of memory ram (2048 MB) and effective_cache_size to 50% (4096 MB) of memory. All this settings to 220 Max Connections. Where I start up the cluster very messages of configurations errors on shared_memmory and SHMMAX look up. I try change the values of shared_memory, max_connections and effective_cache_size and large the size of SHMALL and SHMMAX to use 4294967296 (4096 MB) but the cluster don't start. Only with 15% of value on shared memory i can start up this cluster. In my tests the maximum value who i can put is 1.9 GB, more of this the cluster don't start. Can anybody help me and explicate if exist one limit to memory on 32 bits Architecture. Anybody was experience with tuning servers with this configurations and increasing ? thanks to all. -- Marcelo Costa ---(end of broadcast)--- TIP 5: don't forget to increase your free space map settings
Re: [PERFORM] How much memory in 32 bits Architecture to Shared Buffers is Possible
Yes, my system is DEBIAN SARGE 3.0thanks,Marcelo2006/10/2, Joshua D. Drake [EMAIL PROTECTED]: Marcelo Costa wrote: Hi, to all! Recently i try increasing the memory values of shared buffers on one IBM xseries 255 (Quad XEON 2.8, 8 GB RAM, 2 disk SCSI 36 GB(Raid 1), 1 Storage. You haven't specified your OS so I am going to assume Linux. Where I start up the cluster very messages of configurations errors on shared_memmory and SHMMAX look up. I try change the values of shared_memory, max_connections and effective_cache_size and large the size of SHMALL and SHMMAX to use 4294967296 (4096 MB)but the cluster don't start.You have to edit your sysctl.conf see: http://www.postgresql.org/docs/8.1/static/runtime.htmlI *think* (I would have to double check) the limit for shared memory onlinux 32bit is 2 gig. Possibly 2 gig per CPU I don't recall. I run all 64bit now.Sincerely,Joshua D. Drake-- === The PostgreSQL Company: Command Prompt, Inc. ===Sales/Support: +1.503.667.4564 || 24x7/Emergency: +1.800.492.2240 Providing the most comprehensivePostgreSQL solutions since 1997 http://www.commandprompt.com/-- Marcelo Costa
