try "sa"
On 6/13/08, Stut <[EMAIL PROTECTED]> wrote: > > On 13 Jun 2008, at 23:38, Mohit Anchlia wrote: > >> look at "sar" output and see the wait times on the disk is more than the >> service time. >> > > That command doesn't seem to exist on FreeBSD. Do you know if there's an > equivalent command? > > -Stut > > On 6/13/08, Stut <[EMAIL PROTECTED]> wrote: >> >> On 13 Jun 2008, at 22:56, Dragon wrote: >> >> Stut wrote: >> On 13 Jun 2008, at 22:37, Dragon wrote: >> Stut wrote: >> Hi, >> >> I have a problem with one of the web servers I manage. It runs >> FreeBSD >> 6.2, Apache 2.2.8 and PHP 5.2.1. It runs a high-ish number of pre- fork >> processes (usually around 240). >> >> What basically happens is that during our peak hours in the evening >> the site becomes very slow as does everything on the server. The top >> output shows nearly all httpd processes in the state "devfs" and the >> load is jumping up over 10 but the CPU is 70% idle. There's plenty of >> free memory, over 4GB, and lots of available disk space. >> >> While it's in this state all disk access is painfully slow. I've >> checked all the drives and the RAID card status and everything >> appears >> to be fine. It also recovers itself after a few hours when the >> traffic >> dies down again. >> >> I've spent a lot of today Googling but can't find any reference to >> this particular combination of symptoms. Does anyone have any ideas? >> ---------------- End original message. --------------------- >> >> It sounds to me like your system is waiting on disk resources (I am >> assuming that is what the devfs state is), it is very likely trying >> to use swap space. >> >> Now much memory does this system have? >> >> If it has insufficient memory to keep most things in RAM, it is >> going to use a lot of swap and that will slow things down >> considerably. >> >> Oh how I wish it were that simple... >> >> Mem: 1629M Active, 770M Inact, 392M Wired, 68K Cache, 214M Buf, 4791M >> Free >> Swap: 8192M Total, 8192M Free >> >> No swap in use, plenty of free memory. >> ---------------- End original message. --------------------- >> >> Well, I took my best shot on the info presented. I still think there is >> something in the disk I/O path that is acting as a bottleneck. >> >> Sorry it isn't so easy, I have nothing else here. Wish I could help. >> >> No worries, thanks for trying. >> >> I agree that it's probably disk-related, but other than these symptoms I >> can't find anything wrong. >> >> I'll see if the FreeBSD list can help. >> >> -Stut >> >> -- >> http://stut.net/ >> >> >> --------------------------------------------------------------------- >> The official User-To-User support forum of the Apache HTTP Server Project. >> See <URL:http://httpd.apache.org/userslist.html> for more info. >> To unsubscribe, e-mail: [EMAIL PROTECTED] >> " from the digest: [EMAIL PROTECTED] >> For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> > > --------------------------------------------------------------------- > The official User-To-User support forum of the Apache HTTP Server Project. > See <URL:http://httpd.apache.org/userslist.html> for more info. > To unsubscribe, e-mail: [EMAIL PROTECTED] > " from the digest: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
