Hash Tables of Buffers


 
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Old 06-09-2012
Question Hash Tables of Buffers

Hello,

I want to know how hash tables for buffers were implemented in Unix and now, in linux how they are implemented ?

I am aware of what hashing is..also quite familiar with Unix/Linux.

Special case is how device numbers comes into picture..I am curious !

If possible consider some example like there are 1000 buffers that can stay in buffer pool..
Please do not divert by proving it is of O(1). I know that. I am asking implementation thing!
 
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pwgrd(1M)																 pwgrd(1M)

NAME
pwgrd - password and group hashing and caching daemon SYNOPSIS
logfile] DESCRIPTION
provides accelerated lookup of password and group information for libc routines like and implements per request type caches and hashtables as appropriate. When the corresponding routine in libc is called, a request is issued to via a Unix domain socket connection. determines whether it can satisfy the request, returning the appropriate results to the requesting process. Options recognizes the following options and command-line arguments: Debug mode. Do not become a daemon. Issue additional diagnostic messages. Instead of logging message via issue messages to stderr. Logfile. In addition to logging via will write log messages to logfile. modifies its behavior depending on whether or not the local machine is using some form of NIS for password or group information. When NIS is being used, the hashtables corresponding to that service are not generated or consulted. Therefore only caching is provided for those requests. AUTHOR
was developed by the Hewlett-Packard Company. FILES
Start up configuration variable. Set to if you want to start on reboot. Hash files, status file and daemon Unix domain socket. Client Unix domain sockets. SEE ALSO
pwgr_stat(1M). pwgrd(1M)