Howdy, >I don't see your point. If you put the logged messages to a circular buffer >that holds say 16k messages at a time, then you won't have high memory >usage just 16k*size of a logged message. Of course if your code if full of >debug logging, then the program will be slow, but on the other hand will >give you very valuable feedback in case of an exception/error.
16k times the size of a logged message can be large, first of all. Secondly, that amount might be multiplied many times by having a separate buffer for each logger. Secondly, I like to be able to make the tradeoff of performance versus information myself, i.e. via configuration and reconfiguration at runtime. I will not accept a system that always keeps an extra 16k messages in case there's an error. I'm not saying this feature is a completely bad idea. It can be useful in certain cases. However: - log4j is in a sweet spot performance-wise, and care should be taken to maintain that. - When someone is considering moving to log4j from another package, complaining of the other package's performance, and then asks to add a feature that seems like a performance hog to log4j, that's a red flag for me. I will be glad to be convinced otherwise by a benchmark, however... Yoav Shapira > >> -----Original Message----- >> From: Shapira, Yoav [mailto:[EMAIL PROTECTED] >> Sent: Monday, August 11, 2003 3:29 PM >> To: Log4J Users List >> Subject: RE: log4j: dump wrap-around buffer of all log messages >> >> >> >> Howdy, >> I would really want this sort of feature benchmarked for >> memory use ;) Perhaps this is one of the reasons log4j has >> better performance than your current java trace kit ;) >> >> Yoav Shapira >> Millennium ChemInformatics >> >> >> >-----Original Message----- >> >From: Ceki Gülcü [mailto:[EMAIL PROTECTED] >> >Sent: Monday, August 11, 2003 9:24 AM >> >To: Log4J Users List >> >Subject: Re: log4j: dump wrap-around buffer of all log messages >> > >> > >> >Yes, this is certainly possible. The SMTPAppender works in a similar >> >fashion. >> > >> >At 03:09 PM 8/11/2003 +0200, you wrote: >> >>Dear log4j users, >> >> >> >> >> >>Currently I'm evaluating log4j 1.2.8 to replace an other Java Trace >> >package >> >>(see http://visibleworkings.com/trace/) in our >> applications. Log4j's big >> >>advantage is its performance, but still I'm missing a >> feature that is >> >>present in the Java Trace package: the ability to dump a wrap-around >> >buffer >> >>of, let's say, the last 500 log messages in the log file. >> >> >> >>The wrap-around buffer (think of it as an array of let's say 500 log >> >>messages) contains at any moment, the last 500 log >> messages. The idea is >> >>that the logger has 2 log levels: one which determines what level is >> >present >> >>in the log file (or std out or whatever), another which >> determines at what >> >>level the internal wrap-around buffer is filled with >> messages. This way, >> >it >> >>is possible to let your application log at level INFO, >> while the internal >> >>buffer keeps all messages of level DEBUG or higher. When an >> exception is >> >>thrown, the user should have the ability to request a dump >> of the buffer, >> >>such that the more detailed DEBUG messages are also present >> in the log >> >file >> >>to make debugging more easy. >> >> >> >>Is this possible in log4j? If not, has anyone a workaround >> for this or >> >>should I ask for a feature request? >> >> >> >> >> >>Kind regards, >> >>Patrick Hancke >> >>Siemens Atea IC D BS PD2 >> >>tel ++32(0)14 - 25 24 27 >> >>fax ++32(0)14 - 25 30 25 >> >> >> >>------------------------------------------------------------ >> --------- >> >>To unsubscribe, e-mail: [EMAIL PROTECTED] >> >>For additional commands, e-mail: [EMAIL PROTECTED] >> > >> >-- >> >Ceki For log4j documentation consider "The complete log4j manual" >> > ISBN: 2970036908 http://www.qos.ch/shop/products/clm_t.jsp >> > >> > >> > >> > >> >--------------------------------------------------------------------- >> >To unsubscribe, e-mail: [EMAIL PROTECTED] >> >For additional commands, e-mail: [EMAIL PROTECTED] >> >> >> >> >> This e-mail, including any attachments, is a confidential >> business communication, and may contain information that is >> confidential, proprietary and/or privileged. 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