Hi Geoff et al >> Did you say this is happening on only one of three identical servers?
sorry. not clear. The spikes happen to all three CF servers (no one has noticed this?) but the problem one has the highest spikes (by far). none of the machines are identical. >> JRUN spikes when it is compiling CF code and when it is doing garbage collection. well, it's doing it all the time - like a heartbeat. does it really garbage collect every 20 secs or so? >>What are your JVM settings for the servers? you mean the "Java and JVM settings" in the admin? the only setting there is Maximum Memory Size = 256Mb and the jre path. >> Are you seeing slowdowns during peak traffic or just "for no apparent reason"? well, considering that the problem machine spac's out with as few as 4 people hitting it, I'd have to say "for no apparent reason". >> Are these slow downs only related to the MS Access database environment you mentioned earlier? well, they *are* dealing with datasources in some degree. I've been calling up files without datasources fine (CFFILE - based pages, *.cfm with no CF code in it, etc) and can't get it to do anything silly. I've been thinking (a wild guess) it starts when DWMX polls CF's datasources (using RDS), locks the connections open and then stops pages from using those datasources. But I'm having trouble proving it. And besides, they're both MM product - they should work together happily, yes?* *a cavat: we have used RDS sucessfully many times before with UD4 and ASP/IIS. what we're doing with CF, RDS, MSAccess and a webserver is nothing strange or different. It -could- be a config for RDS (we had all sorts of probs getting it to work with CF) but with so few people on list using DW+RDS and CF it's mostly guesswork. Sadly, we haven't an option to drop RDS or use other db's. anything else worth checking/trying out? thanx barry.b -----Original Message----- From: Geoff Bowers [mailto:[EMAIL PROTECTED] Sent: Wednesday, 29 October 2003 2:40 PM To: CFAussie Mailing List Subject: [cfaussie] Re: CF server "spikes" on CPU Beattie, Barry wrote: > I'm trying to track down a slowing/timeout problem on one of our CF servers > (MS/IIS machines) and I've noticed something strange. > > Using the performance monitor on all 3 of our webservers shows a "spike" in > CPU resources. It looks like a heartbeat - every 20 sec or so (lasts less > than a second). The biggest spike is on the problem machine (97% - the > others are lower). We've worked it back to JRun. High CPU utilisation is not necessarily a bad thing. Throughput is really what you should be worried about. Clearly it is a good thing that when work needs to be done the CPU is utilised. However, that said, sustained CPU load is often indicative of not-so-good things. JRUN spikes when it is compiling CF code and when it is doing garbage collection. And of course it spikes when it has high traffic and work to do. Did you say this is happening on only one of three identical servers? What are your JVM settings for the servers? Are you seeing slowdowns during peak traffic or just "for no apparent reason"? Are these slow downs only related to the MS Access database environment you mentioned earlier? -- geoff http://www.daemon.com.au/ --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MXDU2004 + Macromedia DevCon AsiaPac + Sydney, Australia http://www.mxdu.com/ + 24-25 February, 2004 --- You are currently subscribed to cfaussie as: [EMAIL PROTECTED] To unsubscribe send a blank email to [EMAIL PROTECTED] MXDU2004 + Macromedia DevCon AsiaPac + Sydney, Australia http://www.mxdu.com/ + 24-25 February, 2004
