i have oracle database running on AIX 5.2L with physical memory 80GB.
All database files resides on file system, with total size about 1TB.
We are using JFS (large file enabled).
I heard that JFS by default will consume most idle physical memory for file system cache (cmiiw).
Usually i saw 0 MB left in physical memory.
My question are:
- If another process required memory, do they released automatically from file system cache? Any priority apply here?
- I want to know which files actually hold the memory. What tools to be used?
Re: Static memory allocation ... but I am wondering about physical memory.... There used to be no concept of allocating physical memory in Win32. ... requirement of physical contiguity either. ... executables are backed by the file system.... (comp.lang.asm.x86)
/var size? ... If you intend to use the crash dump feature savecore, allocate... double the amount of your physical memory in the /var file system.... (comp.unix.solaris)
Re: System Cache ... The whole notion of having the file system cache on the hard disc defeats the purpose of the file system cache, which is speeding up file access by bypassing slow disc access! ... There is no "file system cache" on disk...... You can see the maximum size in Task Manager it is about 80% of the RAM.... (microsoft.public.windowsxp.general)
RE: why swap at all? (what the user feels) ... > only major problem with swapping that not all users want file system... > cache to swap out actual applications (thus making that somewhat aged ... due to the file system cache or application usage) will require discarding ... (Linux-Kernel)
Re: Slow Filesystem I/O ... > file I/O operations involved consist in writing a log file from a Java... pre-allocate the space rather than letting the file system extend the file. ... Also monitor your file system cache while you are ... processing (MONITOR FILE/CURRENT) and increase the appropriate ACP sysgen ... (comp.os.vms)
