January 2004
Intermediate to advanced
464 pages
14h 47m
English
Content preview from Squid: The Definitive Guide
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Name
sleep_after_fork
Synopsis
Squid uses the fork( ) system call to spawn helper processes, such as redirectors,
authenticators, and DNS resolvers. On some systems, a rapid sequence
of fork( ) calls consumes all available
real and virtual memory. Thus, a fork(
) call may fail with an “out of memory” error. Note that
this isn’t necessarily a fatal error. Squid continues running as long
as at least 50% of helper processes are successfully started.
To alleviate this problem, you can instruct Squid to sleep for a
small amount of time after each fork( ) call. This gives
the recently forked process time to complete its exec( ) call and free up the
memory.
Don’t set this value too high, especially if you have a large number of helper processes. Squid doesn’t service any client requests until all helpers have been started.
Syntax | sleep_after_fork |
Default | sleep_after_fork 0 |
Example | sleep_after_fork 10000 |
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