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psendfile is a variant of sendfile(1) that runs as a persistent handler. Except those actions of sendfile explicitly triggered by command-line options, psendfile does the exact same things as sendfile, the only difference being that it runs persistently and handles all requests in the same process, instead of spawning a process per request. In doing so, it uses more persistent resources in order to use less resources per request. As such, psendfile is more suitable for a system under heavier load, while sendfile is more suitable for a system under light load.
Accordingly, psendfile is a persistent handler, as defined in ashd(7). See the sendfile(1) manpage for all the details of its operations, as it mirrors that program exactly except in the special options it accepts.
Fredrik Tolf <fredrik@dolda2000.com>