Very nice. The impact can is also reflected and easy to spot in the "Cluster CPU" graphs on Ganglia:
https://ganglia.wikimedia.org/latest/?r=month&c=Application+servers+eqiad https://ganglia.wikimedia.org/latest/?r=year&c=Application+servers+eqiad — Krinkle On 3 Dec 2014, at 17:03, Giuseppe Lavagetto <[email protected]> wrote: > Hi all, > > it's been quite a journey since we started working on HHVM, and last > week (November 25th) HHVM was finally introduced to all users who didn't > opt-in to the beta feature. > > Starting on monday, we started reinstalling all the 150 remaining > servers that were running Zend's mod_php, upgrading them from Ubuntu > precise to Ubuntu trusty in the process. It seemed like an enormous task > that would require me weeks to complete, even with the improved > automation we built lately. > > Thanks to the incredible work by Yuvi and Alex, who helped me basically > around the clock, today around 16:00 UTC we removed the last of the > mod_php servers from our application server pool: all the non-API > traffic is now being served by HHVM. > > This new PHP runtime has already halved our backend latency and page > save times, and it has also reduced significantly the load on our > cluster (as I write this email, the average cpu load on the application > servers is around 16%, while it was easily above 50% in the pre-HHVM era). > > The API traffic is still being partially served by mod_php, but that > will not be for long! > > Cheers, > > Giuseppe > -- > Giuseppe Lavagetto > Wikimedia Foundation - TechOps Team > > _______________________________________________ > Wikitech-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/wikitech-l _______________________________________________ Wikitech-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/wikitech-l
