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Top Forums UNIX for Advanced & Expert Users Deciding whether to get a buffer cache block or inode block Post 302565175 by sreeharshasn on Monday 17th of October 2011 07:25:28 AM
Old 10-17-2011
Deciding whether to get a buffer cache block or inode block

I was reading a book on UNIX internals "The design of the UNIX Operating system." There are two memory structures that are confusing me:
1) Buffer cache
2) Inode cache

My questions are
1) Does a process get both buffer cache and Indoe cache allocated when it opens/creates a file?
2) if no, then when does a process decide that it requires a buffer cache or/and inode cache

pls provide any pointers regarding the information on the above questions.
 

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dbc_max_pct(5)							     OBSOLETED							    dbc_max_pct(5)

NAME
dbc_max_pct, dbc_min_pct, bufcache_max_pct, bufpages, nbuf - OBSOLETED kernel tunable parameter DESCRIPTION
These tunables have been obsoleted and removed. Do not make any changes to these tunables, as they have no effect on the kernel. Use the file cache tunables and (see filecache_max(5)). In previous releases, the tunables and were used to set limits to the dynamic buffer cache, and the tunables and were used for tuning the buffer cache when a static cache was desired. This release of HP-UX offers improved file caching technology and improved physical memory control associated to caching file I/O data. The number of tunable parameters used to control file caching memory usage is reduced from five to two, and previous usability issues are addressed. Restrictions on Changing These tunables should not be modified. Attempting to tune any of the obsolete buffer cache tunables, or results in an error. Use the tunables and to set limits on the file cache. Note that, on a any given system, the optimum values of these two new tunables are not necessarily equivalent to the optimum values of the obsolete buffer cache tunable values in the older systems. You should first deter- mine if the new default values yield acceptable performance on your system, before attempting to change the values of the new file cache tunables. AUTHOR
and were developed by HP. SEE ALSO
filecache_max(5). Kernel Tunable Parameter dbc_max_pct(5)
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