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31 lines
1.6 KiB
Plaintext
31 lines
1.6 KiB
Plaintext
config PCRE2_JIT_ENABLED
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bool
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depends on PACKAGE_libpcre2 && (aarch64 || aarch64_be || arm || i386 || i686 || x86_64 || mips || mipsel || mips64 || mips64el || powerpc || powerpc64 || powerpcle || sparc)
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default y if (arm || i686 || x86_64)
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prompt "Enable JIT compiler support"
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help
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Enable JIT (Just-In-Time) compiler support.
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Just-in-time compiling is a heavyweight optimization that can greatly
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speed up pattern matching. However, it comes at the cost of extra
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processing before the match is performed, so it is of most benefit when
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the same pattern is going to be matched many times. This does not
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necessarily mean many calls of a matching function; if the pattern is
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not anchored, matching attempts may take place many times at various
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positions in the subject, even for a single call. Therefore, if the
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subject string is very long, it may still pay to use JIT even for
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one-off matches. JIT support is available for all of the 8-bit, 16-bit
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and 32-bit PCRE2 libraries and adds about 100KB to the resulting
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libpcre2.so. JIT support applies only to the traditional Perl-compatible
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matching function. It does not apply when the DFA matching function is
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being used.
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Enabling this option can give an about 10x performance increase on JIT
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operations. It can be desireable for e.g. high performance Apache
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mod_rewrite or HA-Proxy reqrep operations.
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However, JIT should _only_ be enabled on architectures that are supported.
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Enabling JIT on unsupported platforms will result in a compilation
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failure. A list of supported architectures can be found here:
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https://pcre.org/current/doc/html/pcre2jit.html#SEC2
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