On 21/12/2011 16:45, Vincent Hoffman wrote: > On 21/12/2011 15:29, Erik Cederstrand wrote: >> Den 21/12/2011 kl. 15.20 skrev Randy Schultz: >> >>> I agree whole-heartedly. I guess I wasn't clear. I wasn't trying to say >>> most >>> SA's never tune, only that from watching other SA's over the years, little >>> tuning is done. >> As a casual SA, I often find I'm fumbling around in the dark to find out if >> my server is running optimally. I can check CPU and memory usage, but >> finding out if I could get my server to perform better by fiddling with >> block sizes or any number of sysctls is daunting. Who knows, maybe my batch >> jobs can complete 50% faster, or my CPU load can go from 20% to 10%? >> >> I really like the mysqltuner script for MySQL in this regard because it >> contains all the hard-earned experience of others and actually manages to >> suggest useful values for the configuration file for me to adjust. It would >> be great if there was something similar for FreeBSD that could suggest >> things like "hey, you are getting interrupt storms on em0, might want to >> check up on that" or "the block size on ada0 is insane for the current I/O >> load" or "on this particular hardware, try setting sysctls xxx and yyy to >> NNN instead" or "process 12345 is doing 1 billion system calls/sec, doesn't >> seem right". Something like taking the suggestions from >> http://serverfault.com/questions/64356/freebsd-performance-tuning-sysctls-loader-conf-kernel >> and trying to guess from my specific setup which knobs might apply, and >> possibly which values. >> >> I'm perfectly aware that this is not a substitution for actually thinking, >> profiling and benchmarking, but at least I'll have a place to start. > I agree that something like mysqltuner would be great, although its such > a wide area to cover a single utility probably would not be practical. > A good start would be updating the tuning(7) man page. Its been a while > since I read it but the first paragraph regarding partition sizes is > most definitely out of date. > Time to reread it followed by groff_man(7) i guess ;) http://people.*freebsd*.org/~kris/scaling/*Help*_*my*_*system_is_slow*.pdf is also a good read, again written a few years ago so parts may be outdated.
Vince > > Vince >> Erik_______________________________________________ >> freebsd-performance@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-performance >> To unsubscribe, send any mail to >> "freebsd-performance-unsubscr...@freebsd.org" > _______________________________________________ > freebsd-performance@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-performance > To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org" _______________________________________________ freebsd-performance@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-performance To unsubscribe, send any mail to "freebsd-performance-unsubscr...@freebsd.org"
