Public bug reported: strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) :
$ gcc -o strstr strstr.c and then run on the 2 platforms : $ vagrant init ubuntu/bionic64 $ vagrant up $ vagrant ssh Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage System information as of Thu Oct 11 09:02:46 UTC 2018 System load: 0.0 Processes: 97 Usage of /: 9.8% of 9.63GB Users logged in: 0 Memory usage: 12% IP address for enp0s3: 10.0.2.15 Swap usage: 0% * Security certifications for Ubuntu! We now have FIPS, STIG, CC and a CIS Benchmark. - http://bit.ly/Security_Certification * Want to make a highly secure kiosk, smart display or touchscreen? Here's a step-by-step tutorial for a rainy weekend, or a startup. - https://bit.ly/secure-kiosk Get cloud support with Ubuntu Advantage Cloud Guest: http://www.ubuntu.com/business/services/cloud 0 packages can be updated. 0 updates are security updates. Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2 vagrant@ubuntu-bionic:~$ cd /vagrant vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa matches = 3000000 real 0m4.877s user 0m4.852s sys 0m0.012s vagrant@ubuntu-bionic:/vagrant$ Same machine : $ vagrant init ubuntu/xenial64 $ vagrant up $ vagrant ssh Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64) * Documentation: https://help.ubuntu.com * Management: https://landscape.canonical.com * Support: https://ubuntu.com/advantage Get cloud support with Ubuntu Advantage Cloud Guest: http://www.ubuntu.com/business/services/cloud 0 packages can be updated. 0 updates are security updates. New release '18.04.1 LTS' available. Run 'do-release-upgrade' to upgrade to it. Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2 vagrant@ubuntu-xenial:~$ cd /vagrant vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa matches = 3000000 real 0m0.525s user 0m0.508s sys 0m0.000s vagrant@ubuntu-xenial:/vagrant$ vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa matches = 3000000 real 0m0.525s user 0m0.508s sys 0m0.000s vagrant@ubuntu-xenial:/vagrant$ ** Affects: glibc (Ubuntu) Importance: Undecided Status: New ** Tags: bionic64 sse2 strstr ** Attachment added: "strstr.c" https://bugs.launchpad.net/bugs/1797335/+attachment/5199882/+files/strstr.c ** Description changed: strstr() from glibc is up to 8 times slower than it was on ubuntu16. Looks like the sse2 optimized code is not used. To reproduce compile attached file (strstr.c) : $ gcc -o strstr strstr.c and then run on the 2 platforms : $ vagrant init ubuntu/bionic64 $ vagrant up $ vagrant ssh Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-36-generic x86_64) - * Documentation: https://help.ubuntu.com - * Management: https://landscape.canonical.com - * Support: https://ubuntu.com/advantage + * Documentation: https://help.ubuntu.com + * Management: https://landscape.canonical.com + * Support: https://ubuntu.com/advantage - System information as of Thu Oct 11 09:02:46 UTC 2018 + System information as of Thu Oct 11 09:02:46 UTC 2018 - System load: 0.0 Processes: 97 - Usage of /: 9.8% of 9.63GB Users logged in: 0 - Memory usage: 12% IP address for enp0s3: 10.0.2.15 - Swap usage: 0% + System load: 0.0 Processes: 97 + Usage of /: 9.8% of 9.63GB Users logged in: 0 + Memory usage: 12% IP address for enp0s3: 10.0.2.15 + Swap usage: 0% - * Security certifications for Ubuntu! - We now have FIPS, STIG, CC and a CIS Benchmark. + * Security certifications for Ubuntu! + We now have FIPS, STIG, CC and a CIS Benchmark. - - http://bit.ly/Security_Certification + - http://bit.ly/Security_Certification - * Want to make a highly secure kiosk, smart display or touchscreen? - Here's a step-by-step tutorial for a rainy weekend, or a startup. + * Want to make a highly secure kiosk, smart display or touchscreen? + Here's a step-by-step tutorial for a rainy weekend, or a startup. - - https://bit.ly/secure-kiosk + - https://bit.ly/secure-kiosk - - Get cloud support with Ubuntu Advantage Cloud Guest: - http://www.ubuntu.com/business/services/cloud + Get cloud support with Ubuntu Advantage Cloud Guest: + http://www.ubuntu.com/business/services/cloud 0 packages can be updated. 0 updates are security updates. - Last login: Thu Oct 11 09:02:17 2018 from 10.0.2.2 vagrant@ubuntu-bionic:~$ cd /vagrant vagrant@ubuntu-bionic:/vagrant$ time ./strstr aa matches = 3000000 real 0m4.877s user 0m4.852s sys 0m0.012s - vagrant@ubuntu-bionic:/vagrant$ + vagrant@ubuntu-bionic:/vagrant$ Same machine : $ vagrant init ubuntu/xenial64 $ vagrant up $ vagrant ssh Welcome to Ubuntu 16.04.5 LTS (GNU/Linux 4.4.0-135-generic x86_64) - * Documentation: https://help.ubuntu.com - * Management: https://landscape.canonical.com - * Support: https://ubuntu.com/advantage + * Documentation: https://help.ubuntu.com + * Management: https://landscape.canonical.com + * Support: https://ubuntu.com/advantage - Get cloud support with Ubuntu Advantage Cloud Guest: - http://www.ubuntu.com/business/services/cloud + Get cloud support with Ubuntu Advantage Cloud Guest: + http://www.ubuntu.com/business/services/cloud 0 packages can be updated. 0 updates are security updates. New release '18.04.1 LTS' available. Run 'do-release-upgrade' to upgrade to it. - Last login: Thu Oct 11 08:22:26 2018 from 10.0.2.2 vagrant@ubuntu-xenial:~$ cd /vagrant vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa matches = 3000000 real 0m0.525s user 0m0.508s sys 0m0.000s - vagrant@ubuntu-xenial:/vagrant$ + vagrant@ubuntu-xenial:/vagrant$ vagrant@ubuntu-xenial:/vagrant$ time ./strstr aa matches = 3000000 real 0m0.525s user 0m0.508s sys 0m0.000s vagrant@ubuntu-xenial:/vagrant$ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1797335 Title: strstr() on ubuntu18.04 8 times slower than on ubuntu16 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/glibc/+bug/1797335/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
