Newsgroups: php.internals
Path: news.php.net
Xref: news.php.net php.internals:111688
Return-Path: <nikita.ppv@gmail.com>
Delivered-To: mailing list internals@lists.php.net
Received: (qmail 17112 invoked from network); 26 Aug 2020 08:34:50 -0000
Received: from unknown (HELO php-smtp4.php.net) (45.112.84.5)
  by pb1.pair.com with SMTP; 26 Aug 2020 08:34:50 -0000
Received: from php-smtp4.php.net (localhost [127.0.0.1])
	by php-smtp4.php.net (Postfix) with ESMTP id 7B5771804B4
	for <internals@lists.php.net>; Wed, 26 Aug 2020 00:37:56 -0700 (PDT)
X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on php-smtp4.php.net
X-Spam-Level: 
X-Spam-Status: No, score=0.6 required=5.0 tests=BAYES_50,DKIM_SIGNED,
	DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM,HTML_MESSAGE,
	RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_PASS
	autolearn=no autolearn_force=no version=3.4.2
X-Spam-Virus: No
X-Envelope-From: <nikita.ppv@gmail.com>
Received: from mail-lj1-f173.google.com (mail-lj1-f173.google.com [209.85.208.173])
	(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
	 key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256)
	(No client certificate requested)
	by php-smtp4.php.net (Postfix) with ESMTPS
	for <internals@lists.php.net>; Wed, 26 Aug 2020 00:37:56 -0700 (PDT)
Received: by mail-lj1-f173.google.com with SMTP id i10so1209890ljn.2
        for <internals@lists.php.net>; Wed, 26 Aug 2020 00:37:55 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20161025;
        h=mime-version:from:date:message-id:subject:to;
        bh=teehVOobu6sOvfbrjywh3SDNecuBuTbkKyZ5g+uYtYQ=;
        b=jvRe2HF/21x7DHzpT15cDXEMxjd39Jiox81AXAWI7ngqnbjD3ODqR8Fbc2cf78po5a
         QzHZeRQQFDJeQFxPG9XggR63SxqWTwHv5680LYJlhSrJmtATBG5h8f+SxkgjoR+pGixl
         gC2yaiKS/COI9QKokoDOieNGjGz2sNesG0PQFk/ZrrYWqPu5VfXVsa82Q6RqCS0Fuy2e
         3lL0U2kKz0BMnQeAQAAl7mC3bmqTf3ThRFAm9IV3TLuVEWqxuMsqpNMs3q4IjReFklK8
         cqq3rOs2PlGx8K+9T1biXgaZ7Qefz90kMt0snnoChPI9dOYRhuh8b8vjDkPJAYddnHtu
         YSAA==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20161025;
        h=x-gm-message-state:mime-version:from:date:message-id:subject:to;
        bh=teehVOobu6sOvfbrjywh3SDNecuBuTbkKyZ5g+uYtYQ=;
        b=CBqMLv+j6oJypLKsAD4f1qCH2znwMq5RyygePtLssFS0qGcF68HSGdGxrupZL1r2YG
         zhIuIBcEvUPyOOAF7vkW0biwlqwlKr/Nf5Mz24bIFFnaOUlcW1AEZOyLuc+UcKOSXi2F
         aQANpivNHtrcH5000KGMhq94SOWtM/UFBzby7rfowOcP0JpYcbIhiWzZa9BqDmzhHrmX
         aZ/uescZBw3/9HxeSOTc9Z6tp8kQ2D0MfAwlJlieZ2Uc3iJdmlEICMLMPF41a/ael82h
         s7G/4C0r6IVANbDK9NQ95mReGIHvka12zKrJu66HwH7ir/SkFdHjhau1utpYj/mrYBl1
         qSAA==
X-Gm-Message-State: AOAM5335CpsfZmZVcjQO3CjJaW0b+B/KentO+9cYVR7pzkBSn+JR5mv3
	d6rwfRHTSu1wf1WxOgZNd0lF53Cu9nkn7xl/rAGj6b7mtXNjqg==
X-Google-Smtp-Source: ABdhPJzBclZ0dHC4TiSgZnvYuhy5/VCgBLy4pvtK7jTmJffAuL9XJ8oXq6naOpk1R9CD/c5zl0ZLP15USQxG2SRo/g8=
X-Received: by 2002:a2e:8e70:: with SMTP id t16mr7042059ljk.81.1598427470302;
 Wed, 26 Aug 2020 00:37:50 -0700 (PDT)
MIME-Version: 1.0
Date: Wed, 26 Aug 2020 09:37:34 +0200
Message-ID: <CAF+90c-UQF1u6RSE1H-WDwGVBpB--+ta8axeTtu5D=3mrww0zQ@mail.gmail.com>
To: PHP internals <internals@lists.php.net>
Content-Type: multipart/alternative; boundary="0000000000009115ad05adc2e5a4"
Subject: Session mm support
From: nikita.ppv@gmail.com (Nikita Popov)

--0000000000009115ad05adc2e5a4
Content-Type: text/plain; charset="UTF-8"

Hi internals,

I've recently found out that compiling PHP with --with-mm has a massive
negative impact on PHP startup performance (approximately 3-4 times
slower), to the point that our CI got approximately 2x slower overall with
it enabled. This is not great.

As I only found out about the existence of this session backend recently,
I'm wondering how widely it is used, and whether we wouldn't be better off
dropping it from php-src. The performance characteristics make it a pretty
big foot-gun.

Regards,
Nikita

--0000000000009115ad05adc2e5a4--