Public bug reported: Binary package hint: scim
Note: this problem is fixed upstream, and the fix is integrated on the new scim release (scim 0.4.7). I report the bug here so Ubuntu do consider either updating the scim package for Gutsy release, or backport the fix (this is just a few line diff). PowerTOP tool (http://www.linuxpowertop.org/), revealed that scim- launcher is on the top battery drains on laptops, by causing a total of 13 or 14 CPU wakeups from idle per second (10 from a scim-launcher process, and 3/4 from scim-panel-gtk). Asking on the powertop's IRC channel, an other SCIM user confirmed this behaviour on his system (confirmed again by an other friend by email). The main problem (for the 10 wakeups/second part) stands in modules/FrontEnd/scim_x11_frontend.cpp (lines 460 to 503), where a select() is run in an infinite loop (in "while (!m_should_exit)") with a very short timeout of 0.1 second (100000 usec). This select() is restarted after every timeout unless a global variable (m_should_exit) is modified by an external source. I didn't yet investigated the cause of the 3-4 scim-panel-gtk's wakeups (strace shows a loop of gettimeofday() and poll() calls). Fixing those problems should significantly improve batteries lifetime for SCIM users (by default on Ubuntu, every Chinese and Japanese user) out there. ** Affects: scim (Ubuntu) Importance: Undecided Status: New -- scim-launcher select() shorts timeouts causes too much CPU wakeups https://bugs.launchpad.net/bugs/122445 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
