Hi Scott, Thank you for your time. I did what you suggest, and I've noticed two strange things.
1. Compiling showed me the following warnings: gcc -o mytest mytest.c -lpthread mytest.c: In function ‘child’: mytest.c:83: warning: format ‘%3d’ expects type ‘int’, but argument 4 has type ‘ clock_t’ mytest.c:83: warning: format ‘%d’ expects type ‘int’, but argument 5 has type ‘c lock_t’ mytest.c:83: warning: format ‘%d’ expects type ‘int’, but argument 6 has type ‘c lock_t’ and so on ... 2. I was not able to test it with 500threads - it is production server, so ... I did it with 16. Here is the result: ./mytest 16 ### Prep: loops_per_tick: 289017 threads : 16 ### Test: looptype : cont samplesleep : no ## start ## ## done. ## loop total: user : 8800 ms system : 80 ms elapse : 4000 ms error : 0 result: GOOD Segmentation fault ^^^ Result is good - but there is a segmentation fault. Furthermore, testing with apache, I found that the source of the problem are the threads that are dying - because if I leave MaxSpareServers=MaxClients and MaxRequestsPerChild=0 ( so no thread is killed) then CPU usage seems normal. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/710319 Title: CPU usage is incorrect on server-status page -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
