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nicholas (3034)
emacs, er, Java makes all computers slow
Eight megs and constantly swapping? Pah? Who needs emacs to make a computer slow when you have Java. (Or more specifically, Tomcat on a 2.4 Linux kernel).
PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
21543 wist 25 0 117M 117M 11368 S 0.0 2.9 0:09 0 java
21556 wist 15 0 117M 117M 11368 S 0.0 2.9 0:05 0 java
21558 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 2 java
21561 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
21600 wist 24 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
21601 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
21602 wist 15 0 117M 117M 11368 S 0.0 2.9 0:07 2 java
21603 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24721 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24722 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24723 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24724 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 1 java
24791 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
24792 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 1 java
24793 wist 17 0 117M 117M 11368 S 0.0 2.9 0:24 2 java
24794 wist 18 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
24795 wist 17 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
24796 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 1 java
24797 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 1 java
24798 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24799 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24800 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24801 wist 25 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
24802 wist 15 0 117M 117M 11368 S 0.0 2.9 0:00 0 java
30489 wist 17 0 117M 117M 11368 S 0.0 2.9 0:00 3 java
4 Gigs of RAM disappears rather quickly. Particularly when there is more than 1 user running java. (b.t.w., this is why Parrot needs to run interpreted code quickly, and "just JIT it" is not a universal answer. Consider the case of many many processes running the same bytecode compiled scripts on a shared machine, and how much memory each would want for the JIT invocation)
--Donald E. Knuth
not that java ain't a pig... (Score:2)
...but are all those threads for the same process rather than separate processes? I have a Tomcat 4.x server running on a Linux 2.4.x kernel and see the same thing.
You probably know this, but just in case: you can cap the memory a JVM uses with command-line arguments: -Xms=xxxM sets the initial heap size (in MB), -Xmx=xxxM sets the max. (More with 'java -X -?'.) With tomcat these are typically set in your bin/catalina.sh file using JAVA_OPTS from the environment.
Re:not that java ain't a pig... (Score:2)
Re:not that java ain't a pig... (Score:2)
Conspiracy theories (Score:1)
My personal theory is that Java is a fraud perpetrated by Sun to stimulate hardware sales. "What? Too slow? Tends to eat up all of swap? You obviously need our new E20599000!"
threads (Score:1)
The reason that machine is slow is because it starts swaping programs to it's local IDE disk to get more buffer space reading from a SAN that has 8GB of read cache, and the ide causes interrupt storms and the machines start crawling..
Linux in it's infinitly stupid swap implementation.
sky