On 25/01/2012 21:48, André Warnier wrote: > Celso Magalhães Dantas Neto wrote: >> Thanks everyone for the reply! >> >> My problem is not to argue how the application is consuming RAM, but to >> show that 150MB is not too much memory. But for that I'd like to use >> trusted information such as an article, or official info. The client >> doesn't understand anything about technologies but has opened the Windows >> Task Manager and saw that Tomcat is on top 3 in memory consumption. I >> just >> need to argue with him that 150MB is normal for a Java web app. > > Celso, > > your client, as you describe, knows nothing about technology or > programming. > And in this case, you are his expert. > So if he knows nothing about the subject, but he does not accept the > opinion of an expert, then the problem with your customer is bigger than > about a few MB of RAM, and you are probably wasting your time. > > As mentioned previously, the current cost of 150 MB of RAM is about US$ > 2.00. > So why are you (both) wasting your time about this ? > >> >> I know that "normal" really depends on how your/my application > > Exactly. And nobody here knows your application, so nobody can tell you > if 150 MB total is justified or not in this case. > >> And yes I could start Tomcat with no app, and create a 1 CRUD > application, > but I would prefer to argue with some trusted article or official > information. > > This user list is the official Apache Tomcat project's users list, where > Tomcat users from the whole world come to report problems and get advice > and help. > Many of the people here answering questions are members of the official > Tomcat development team. "MarkT" and "Pid" who answered before, /are/ > Tomcat developers. How much more "official" do you need ? Would some > article on Google written by some unknown "expert" be better ?
I'm not actually a committer. Just a mailing list lurker. p > And what these real experts have been telling you so far is that 150 MB > of total memory shown in the Windows Task Manager, to run a Java JVM + > Tomcat + an application is nothing that makes anybody wonder. It looks > perfectly "normal" for an application which does something useful, as we > assume yours does. > > > If it may help : > > Following are some snapshots taken tonight on different production Linux > systems, using the Linux "ps" utility, and sorting the processes by > memory usage (more memory first). > In each case, Tomcat runs basically the same simple application, > consisting of a single servlet. > As you can see, in most cases the top slots are occupied by java > processes, with Tomcat among them. And they all use much more than 150 > MB, despite the fact that all these systems are in Europe, and not doing > very much right now. > > > system # 1 : > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 26076 root 20 0 2386m 1.1g 9232 S 0 9.5 13:41.97 java > 21875 tomcat55 20 0 698m 209m 9.8m S 0 1.7 54:02.10 jsvc > 3862 star 20 0 418m 176m 8936 S 0 1.5 20:24.53 java > > system # 2 : > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 3053 tomcat55 20 0 320m 120m 12m S 0 6.0 462:27.13 jsvc > 2916 star 20 0 353m 93m 11m S 0 4.7 376:03.26 java > 21871 star 20 0 285m 79m 7648 S 0 4.0 2:49.06 java > > system # 3 : > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 32116 www-data 20 0 717m 198m 6044 S 0 9.9 0:57.12 apache2 > 2958 tomcat55 20 0 456m 195m 9368 S 0 9.7 2120:42 java > 32065 star 20 0 411m 142m 8996 S 0 7.1 12:34.17 java > 32126 www-data 20 0 667m 138m 6056 S 0 6.9 0:37.78 apache2 > > system # 4 : > > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND > 3189 tomcat55 20 0 435m 296m 12m S 89.1 14.6 3049:49 jsvc > 2744 root 20 0 3276 1348 1108 R 9.6 0.1 3658:11 vmware-guestd > 17156 mira 20 0 40488 36m 2340 S 0.7 1.8 104:18.14 MiraLoader.pl > 3234 star 20 0 214m 38m 11m S 0.3 1.9 46:10.17 java > > The "RES" column is the "resident" memory, "VIRT" is the virtual memory. > Compare that with the equivalent columns in your customer's Windows Task > Manager. > Note : the "jsvc" program is also java, running Tomcat. > > Unfortunately, I do not have an equivalent system running Windows, but > the figures would be much the same. > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > -- [key:62590808]
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