Re: the experimental jit-branch is impressive

Am 02.05.2017 um 20:53 schrieb Nikita Popov:

        These results are very unlikely. I'm 95% sure your benchmark is
        broken. My first guess would be that you're benchmarking PHP +
        JIT against PHP without opcache. Please share the relevant
        (opcache-related) portion of the php.inis you used

    no they are not - since i build RPM packages and even the whole
    spec-file is unchanged, only the tarball changed and the build is
    highly optimized i can assure you for 100% that i compare PHP
    7.1.5RC1 with https://github.com/zendtech/php-src
    <https://github.com/zendtech/php-src> downloaded today

    maybe the PGO-profiling running autotests and fuzzy-calls on the
    whole application as well as 2000 cms-requests combined with the
    compiler flags improves the JIT itself

    without opcache the results for 7.1.5 are *dramatically* slower

    and i repeated the test upgrade/downgrade packages and run "ab"
    multiple times on that machine - attached the "php.spec" which is
    used for the build

    in just downloaded the zip from https://github.com/zendtech/php-src
    <https://github.com/zendtech/php-src>, renamed it to "php-7.2.0",
    made a tar.xz archive, changed the version on teh frist line in the
    spec file and fired the build/profiling - nothing else changed

You have xdebug enabled...

loaded, but not enabled xdebug.default_enable = 0 xdebug.profiler_enable = 0 xdebug.profiler_enable_trigger = 1

7.1.5:             Requests per second: 136.46
7.1.5 opcache:     Requests per second: 316.77
7.2.0 JIT PGO:     Requests per second: 925.96

7.2.0 JIT NON-PGO: Requests per second: 849.99 around 8% are the difference with or without PGO, no idea how much strict-types and a 100% typehinted codebase makes a difference to the JIT operations