David, CPU load is also very low, maximum is 80%. There are two CPUs (real, not virtualized) in the server and according to the performance view on Windows there could be much more users on the system. But I'm not sure if that performance view is true or not ...
Frank David Smith-2 wrote: > > But I'm not sure it would show as a disk bottleneck. If you have > frequent small writes to a disk and each write is delayed while > antivirus checks the datastream for virus signatures, the many tiny > delays could aggegate in to a much bigger file i/o slow down. The > system may experience a higher CPU load rather than a disk bottleneck. > > --David > > Frank Niedermann wrote: > >>David, >> >>that is a good idea from far, far away :-) >> >>Antivirus is enabled (I'm not suicidal, this is a Windows box ;) but >>according to the Windows performance viewer there is no bottleneck on the >>harddisk, it's always way under 10% load. >> >>Frank >> >> >>David Smith-2 wrote: >> >> >>>I think a long time ago in a galaxy far, far away I remember something >>>about antivirus impacting file I/O performance. Would your box happen >>>to have antivirus enabled? If so, any chance you could exclude your >>>logs from it and/or disable it for the purpose of a test? >>> >>>--David >>> >>>Frank Niedermann wrote: >>> >>> >>> >>>>Unfortunately I have to use Windows Server 2003 as the company behind the >>>>application we're using is not supporting UNIX/Linux. >>>> >>>>Windows also has performance utilities but they tell me that the server >>>>isn't heavily loaded at all. >>>> >>>>A good think would be to have a smaller access log just for statistics, >>>> >>>> >>like >> >> >>>>only one line per user access and not every file which transferred to the >>>>user (html, images, js and so on) ... >>>> >>>>Frank >>>> >>>> >>>>Tim Funk wrote: >>>> >>>> >>>> >>>> >>>>>Something seems odd with your system. I have pounded some tomcat >>>>>installations with old unix hardware with and without access logging and >>>>>could hardly tell the difference. >>>>> >>>>>In linux - i was able to tell more of a difference, but not enough to >>>>>turn off logging. >>>>> >>>>>I am at a loss of where the bottleneck is. If your using *nix - your >>>>>system should have some OS benchmarking to see disk utilization or other >>>>>potential bottlenecks. >>>>> >>>>>Good luck. >>>>> >>>>>-Tim >>>>> >>>>>Frank Niedermann wrote: >>>>> >>>>> >>>>> >>>>> >>>>>>I've installed LambdaProbe and it tells me that there are not much >>>>>>Threads >>>>>>(about 50) and most of them are in state of waiting or timed_waiting. So >>>>>>that seems to be okay - but what if Tomcat sent the response to the >>>>>> >>>>>> >>first >> >> >>>>>>user request and then does the logging, while the next request or other >>>>>>users are waiting? >>>>>> >>>>>>And this: >>>>>>The log files are under 20 MB, that should be fine, shoundn't it? The >>>>>>disk >>>>>>is way far from beeing full and it's a RAID1 with SCSI disks so they >>>>>>should >>>>>>have enough performance. >>>>>> >>>>>>I'm now totally unsure if I should enable access.log-files (to have >>>>>>statistics with AWstats) or disable them (to have more performance) ... >>>>>> >>>>>>Frank >>>>>> >>>>>> >>>>>>Frank Niedermann wrote: >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>>>Tim, >>>>>>> >>>>>>> >>>>>>>Tim Funk wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>>>Unless you are max'd on working threads - access logging should not be >>>>>>>>a >>>>>>>>performance hit. Access logging takes pace after the response is sent >>>>>>>>to >>>>>>>>the client. >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>BUT if the access logs are big, AND you a re low on disk, AND/OR your >>>>>>>disk is SLOOOOW then that could be a problem. The overhead of logging >>>>>>>the access log is pretty low. >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>> >>>>>>The log files are under 20 MB, that should be fine, shoundn't it? The >>>>>>disk >>>>>>is way far from beeing full and it's a RAID1 with SCSI disks so they >>>>>>should >>>>>>have enough performance. >>>>>> >>>>>>I'm now totally unsure if I should enable access.log-files (to have >>>>>>statistics with AWstats) or disable them (to have more performance) ... >>>>>> >>>>>>Frank >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>> >>>>>--------------------------------------------------------------------- >>>>>To start a new topic, e-mail: users@tomcat.apache.org >>>>>To unsubscribe, e-mail: [EMAIL PROTECTED] >>>>>For additional commands, e-mail: [EMAIL PROTECTED] >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>>> >>>> >>>> >>>> >>>> >>>--------------------------------------------------------------------- >>>To start a new topic, e-mail: users@tomcat.apache.org >>>To unsubscribe, e-mail: [EMAIL PROTECTED] >>>For additional commands, e-mail: [EMAIL PROTECTED] >>> >>> >>> >>> >>> >> >> >> > > > --------------------------------------------------------------------- > To start a new topic, e-mail: users@tomcat.apache.org > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > > > -- View this message in context: http://www.nabble.com/Performance-decreasing-if-access.log-enabled-tf2408485.html#a6717628 Sent from the Tomcat - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
