Hi Dmitry, > -----Original Message----- > From: Dmitry Stogov [mailto:[email protected]] > Sent: Monday, September 14, 2015 12:58 PM > To: Anatol Belski <[email protected]>; Kalle Sommer Nielsen <[email protected]>; > Rasmus Lerdorf <[email protected]>; Xinchen Hui <[email protected]>; > Nikita Popov <[email protected]>; Zeev Suraski <[email protected]>; Andi > Gutmans <[email protected]>; PHP Internals <[email protected]> > Subject: [PHP-DEV] Re: [PHP-CVS] com php-src: Added an experemental ability > to move PHP code pages (PHP TEXT segment) into HUGE pages. PHP should be > configured and built with --enable-huge-code-pages, OS should be configured to > provide huge pages. It's possible to > > The effect of this patch is really exiting to keep it disabled by default... > :) > > $ perf stat -e instructions,iTLB-loads,iTLB-load-misses,cycles > sapi/cgi/php-cgi -d opcache.enable_huge_code_pages=0 -T 10000 > /var/www/html/bench/wordpress-3.6/index.php > /dev/null > > 191,778,620,621 instructions # 0.81 insns per > cycle > 178,497,016 > iTLB-loads > 87,351,276 iTLB-load-misses # 48.94% of all iTLB > cache hits > 238,136,402,797 > cycles > > 110.221114219 seconds time elapsed > > $ perf stat -e instructions,iTLB-loads,iTLB-load-misses,cycles > sapi/cgi/php-cgi -d opcache.enable_huge_code_pages=1 -T 10000 > /var/www/html/bench/wordpress-3.6/index.php > /dev/null > > 191,780,181,536 instructions # 0.83 insns per > cycle > 39,017,004 > iTLB-loads > 41,631,359 iTLB-load-misses # 106.70% of all iTLB > cache hits > 231,287,491,307 > cycles > > 107.742837269 seconds time elapsed > > May be we should enable this by default in RC (may be also file cache) and > make > decision based on feedback? > The file cache feature has proven itself as stable already, IMHO it should be built by default in RC3.
With the new huge memory pages feature I'd suggest a bit softer - enabling its building, but setting opcache.enable_huge_code_pages=0 by default. Then it can be easy enable and give one more intermediate step for pre testing and go into RC4 completely if ok. What do you think? Regards Anatol -- PHP Internals - PHP Runtime Development Mailing List To unsubscribe, visit: http://www.php.net/unsub.php
