9.72 on page 1050) causes sendmail to process
eachqueue directory extremely fast, regardless of how many messages are
queued in each.
11.3.1.2 Processing multiple queue directories
When sendmail processes multiple queue directories it processes them in parallel.
That is, it forks and runs a queue processing child of sendmail for each, all of which
run at the same time. The maximum number of sendmail queue processors run is
limited by the MaxDaemonChildren option (?§24.9.65 on page 1044). If that limit is
reached before all the queue directories can be parallel-processed, sendmail will
remember where it stopped and perform the next run starting from where the prior
run left off.
The only exception to this behavior occurs when queue processing with the -v (verbose)
command-line switch. When -v is combined with -q, processing is always
sequential. That is, one queue directory is processed at a time, and the next is not
begun until the first finishes. The -v allows you to watchth e queue being processed,
so it makes sense that you would want to watch only one queue directory at a time.
11.3.2 Using qf, df, and xf Subdirectories
Beginning withV8.10, sendmail allows the qf, df, and xf files to reside in separate
directories. One advantage to this is that it produces directories that are one-third
smaller. Another advantage is that each part can reside on a separate disk for further
performance enhancements.
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