Hi all,

i was trying to get the status of memory usage and disk usage using sigar in windows and ubuntu. done this in windows by just copying the sigar library into jdk library. But i was unable to do so in ubuntu. I've copied the library to java-6-sun library but still can't run the program.
what should i do?
please help

You can check memory uses and disk uses using the following command:
and

You can also check this file: /proc/meminfo

For graphical representation of the same put into one, you can use gnome-system-monitor.

sayan and linuxlover,

i am doing this for my final year project. I can't simply use that.
I have to write my own code for that.
please, i need help with the third party libray.
where should i copy the library to?

Even if you copy it to jdk, you need to have jdk in your path to execute it directly. Else you will need complete path to the executable.
And can you tell what you did in Ubuntu?

You can try copying that library file in /lib directory.........

i copied the sigar.jar and the other sigar's important libraries into the jdk library in ubuntu.
i was trying to get the memory usage status. hwhat should i do with the libraries?
i have even tried to put the library in the same directory with the code, and compile it.
compile successfully, but once i run the code using this command:
java -cp sigar.jar MemoryMonitor
it gave me this error:

rose@rose-desktop:~$ java -cp sigar.jar MemoryMonitor
Exception in thread "main" java.lang.NoClassDefFoundError: MemoryMonitor
Caused by: java.lang.ClassNotFoundException: MemoryMonitor
at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
Could not find the main class: MemoryMonitor. Program will exit.

so, i guess, it will be better for me to simply put the library in the jdk library.
i don't have to type that command each time i wanted to compile and run the code.

http://www.hyperic.com/products/sigar

> > http://sourceforge.net/projects/sigar/files/
> http://sourceforge.net/projects/siga...3.zip/download
> > hyperic-sigar-1.6.3.zip

unzip hyperic-sigar-1.6.3.zip :
The Linux library is libsigar-x86-linux.so (( or libsigar-ia64-linux.so ))

The windows version will of course not work in Linux !

And please read the documentation :
hyperic-sigar-1.6.3/docs/javadoc/index.html

The source code ( in case the binary lib isn't working )
http://sourceforge.net/projects/siga...ar.gz/download
> hyperic-sigar-1.6.3-src.tar.gz
.....

OMG,

i have done that, i've mentioned earlier. Please, i have read the documentation, it's not helpful at all.
they didn't stated how to and where to put the library in ubuntu.

OMG! Link us to the actual guide/docs you used then, instead of telling people the free advice they're giving you in their free time is not helpful.

Consider doing a FYP you can do, or if not, doing a degree you'll work harder towards next time. Maybe a degree with a strong element in Reading; Look at what Sayan said:

.

Did you read the file? Do you understand what /proc/ is? On Linux, all you really need is to be reading from /proc/- you'll save yourself a lot of work.

The shared library = libsigar-x86-linux.so :
/usr/lib/ will be OK for it to be found, I guess.

"files.jar" goes to /usr/share/java/ , but be careful,
similar jar files may be there already.

.....

hi knudfl,

Thanks for being patient and guiding me.
I've copied that into both directory and once i compile the program,
i got this error:

MemoryMonitor.java:3: package org.hyperic.sigar does not exist
import org.hyperic.sigar.Mem;
^
MemoryMonitor.java:4: package org.hyperic.sigar does not exist
import org.hyperic.sigar.Swap;
^
MemoryMonitor.java:5: package org.hyperic.sigar does not exist
import org.hyperic.sigar.Sigar;
^
MemoryMonitor.java:6: package org.hyperic.sigar does not exist
import org.hyperic.sigar.SigarException;
^
MemoryMonitor.java:11: cannot find symbol
symbol : class Sigar
location: class MemoryMonitor
private static Sigar sigar = new Sigar();
^
MemoryMonitor.java:11: cannot find symbol
symbol : class Sigar
location: class MemoryMonitor
private static Sigar sigar = new Sigar();
^
MemoryMonitor.java:22: cannot find symbol
symbol : class Mem
location: class MemoryMonitor
Mem mem = null; // assign memory and swap memory to null
^
MemoryMonitor.java:23: cannot find symbol
symbol : class Swap
location: class MemoryMonitor
Swap swap = null;
^
MemoryMonitor.java:30: cannot find symbol
symbol : class SigarException
location: class MemoryMonitor
catch (SigarException s){
^
9 errors

still, the library is not found
and sayan, thanks for the suggestion

james,

it's good to know that you are expert but you have no right to scold other.
please be nice, this is forum. Some might not be happy with what you said.
Anyway, thanks for that.

@rosy Jovita, Most welcome.

Hi Guys,

I did it!
thanks a lot, using this command: javac ./sigar.jar:. MemoryMonitor.java
I guess, it's better to do it this way rather than copy the library into java library.
Thanks all.