I have 3-4 values.
First moskito gives me an min/average/max serving time for all my
servlets, actions and services. So I know whether the system really
got slower and where.
Second we measure cpu time spend in user mode and idle time and know
how much cpu time we consume per user.
In case user report performance problems and the above values show no
change, I would run a JMeter based load test (or something similar).
However, this isn't an option for you, since you need to have the data
from the time "before it got worse" to have something to compare.
regards
Leon
On 10/10/06, Frank Niedermann <[EMAIL PROTECTED]> wrote:
Hi Leon,
you're right - performance is decreasing with log enabled, not increasing.
Would be nice if it was so ;-)
Unfortunately I don't know how to measure specific values, at the moment I'm
listening to my users ("it was faster yesterday without log enabled") and
colleagues ("I had a case where everything went slow with log enabled").
How do you measure performance on your environments?
Regards,
Frank
Leon Rosenberg-3 wrote:
>
> do you have any resource problems?
> How do you know that the performance is falling, and what does falling
> exactly mean? 10%? 1%? 1 ms per request?
>
> regards
> Leon
>
> On 10/9/06, Frank Niedermann <[EMAIL PROTECTED]> wrote:
>>
>> 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]
>> >>>
>> >>>
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >>
>> >
>> >
>> > ---------------------------------------------------------------------
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>> >
>> >
>> >
>>
>> --
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>>
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>>
>>
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