Thnak you for answer. We can NOT use X86_64 due to application NOT support 64 bits. If I take some RAM out of server (for example take out 32 GB RAM and left 32 GB RAM on server), will problem fix? Thanks. --- 10/11/24 (三)，John R Pierce <pierce at hogranch.com> 寫道： > 寄件者: John R Pierce <pierce at hogranch.com> > 主旨: Re: [CentOS] CENTOS 5.5 X86 continue get "out of memory" error????? > 收件者: "CentOS mailing list" <centos at centos.org> > 副本: "mcclnx mcc" <mcclnx at yahoo.com.tw> > 日期: 2010年11月24日,三,下午7:13 > On 11/24/10 3:59 PM, mcclnx mcc > wrote: > > we just installed CENTOS 5.5 X86 (32 bits) on DELL > server. After installed we also apply lated O.S. > patches. > > > > This server have 64 GB RAM and run > "2.6.18-194.26.1.el5PAE #1 SMP ". when I doing "cp", > "mv". "ftp", .... it continue "kill" my process and > pop up "out of memory" on /var/log/messages: > > > > ... > > > > any one know why? > > > > Is CENTOS X86 5..5 really NOT stable version? > > no, using 32 bit PAE with 64GB of memory means your page > tables are > using ALL of the available 1GB kernel address space > available. > the 32 bit kernel chokes itself under these extreme > conditions. this > is an architectural feature of the Intel x86, the > "solution" is 64 bit > mode where the page tables and kernel and a user process > don't all have > to fit into 4GB of address space. > > > >