home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: comp.sys.hp
- Path: sparky!uunet!ukma!wupost!sdd.hp.com!scd.hp.com!hpscdm!cupnews0.cup.hp.com!pasq
- From: pasq@cup.hp.com (Mark Di Pasquale)
- Subject: Re: Help with performance prob. on HP9000/815
- Sender: news@cupnews0.cup.hp.com
- Message-ID: <BxBHKu.DC@cup.hp.com>
- Date: Fri, 6 Nov 1992 23:07:42 GMT
- References: <1992Oct19.200016.22757@cactus.org>
- Organization: Hewlett-Packard
- X-Newsreader: TIN [version 1.1.4 PL6]
- Lines: 54
-
- : * The statdaemon process gets nearly a second of CPU for about every
- : 30 seconds of wall clock time. Up six days (including a weekend) and
- : statdaemon has 325 cpu minutes on it. (What does statdaemon do?)
-
- This is the sched_cpu() routine in the kernel. Its primary function is
- to calculate process priorities (making them better). When a process
- runs, a routine called hardclock() calls setpri() to make a process'
- priority worse. sched_cpu() calls setpri() to make process priorities
- better. A few things go into the priority calcuation (system load, time
- since last running, and more). All of this works together (with other
- stuff) to implement round-robin timesharing of the CPU.
-
- : * The system will never go to 100% idle. Even when there is nothing going
- : on (single user mode - no users on) the sar output says that about 8% of
- : the CPU is going to system. This is not a problem - but on all other
- : HP-9000s I have looked at - when the system is quiet - the sar idle
- : time stays between 98% and 100%. (I think this is a symptom).
-
- Do you know what the system was used for when you let the client site
- borrow it? Did they see the performance slow down? Any clues from
- them?
-
- Bottlenecks are typically CPU, Memory, Swap, File Access, Lan. However,
- it is possible that what seems like a bottleneck in one area is actually
- cause by something in another area. For example, the CPU could be busy
- for a reason other than a CPU bottleneck. Are you able to do some
- isolation (e.g., disconnect the lan, add more swap, see which processes
- are running, add more memory -one at a time- and then measure the
- results)?
-
- : * We have re-loaded and rebuilt the OS a couple of times.
-
- Was this an update or a scratch install? A scratch install, where you
- remake the file systems, etc. will certainly clean things up. BTW, were
- you running the same OS before and after the client borrowed the system?
- What OS are you running now?
-
- : * I got a free copy of GLANCE and it did not tell me (or HP) anything
- : useful.
-
- Does this mean that you had on on-site SE who used this tool and was not
- able to help?
-
- Regards,
- Mark DiPasquale
-
- _______ ________________________________________________________________
- /
- / All appropriate disclaimers apply...
- ____ ___ /
- / / / /
- __/ __/ _____/
- /
- ___________ __/ __________________________________________________________
-