06-29-2007
Tuning Java on LINUX - My syste info
Hi,
I have provided information requested against each query below.
1. what is the total size of physical memory?
=> 4GB
2. what is the size of your swap space?
=> 2GB
3. what is the amount of free memory plus unused swap space when the operating system is just idling?
=> Not sure how would I find that. However, below is info found at header on running "top" command
top - 13:53:56 up 1 day, 2:41, 6 users, load average: 2.95, 2.84, 2.81
Tasks: 121 total, 4 running, 117 sleeping, 0 stopped, 0 zombie
Cpu(s): 33.2% us, 16.6% sy, 0.1% ni, 50.1% id, 0.0% wa, 0.0% hi, 0.0% si
Mem: 4149212k total, 3375016k used, 774196k free, 244924k buffers
Swap: 2097144k total, 0k used, 2097144k free, 2755996k cached
The "free" command yeilds below details on memory usage.
free
total used free shared buffers cached
Mem: 4149212 3374120 775092 0 244844 2755816
-/+ buffers/cache: 373460 3775752
Swap: 2097144 0 2097144
4. what is the maximum you can successfully set it to?
=> Currently I could set upto -Xms2588m -Xmx2588m
Please let me know if you need further information.
Thanks,
Crabbie
7 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
DOes any1 know if the java.awt and javax.swing packages are
installed in Redhat Linux 9.0 or not??. I have compiled a simple Java program and ran it but the Java programs related to GUI are not working. Can any1 provide some Help?. (4 Replies)
Discussion started by: rahulrathod
4 Replies
2. UNIX for Dummies Questions & Answers
is it advisible to do Linux Programming in JAVA.. If so, whats the advantage over C++ or C.. Cud anyone also help me out by providing some links in this regard.. Would be highly appreciated.. (1 Reply)
Discussion started by: srikumar_cs
1 Replies
3. Web Development
We have been tuning MySQL lately and I ran accoss two useful tools that you might be interested in:
mysqltuner.pl
tuning-primer.sh
Both of these scripts are quite useful for MySQL tuning. Here is some sample output of mysqltuner.pl
>> MySQLTuner 0.9.8 - Major Hayden... (3 Replies)
Discussion started by: Neo
3 Replies
4. Red Hat
Hi All,
I'm looking for good reference books or white papers about Linux Redhat Performance tuning / system tuning.
Thanks for any advice. (0 Replies)
Discussion started by: linuxqwer
0 Replies
5. Android
In case you did not know, Android 2.1, Éclair, runs on the 2.6.29 Linux kernel. However, the user space it is built atop Dalvik, a Google-designed custom JVM (Java virtual machine).
This is pretty interesting, when you think about it. The core of Android is the linux kernel, and the standard... (5 Replies)
Discussion started by: Neo
5 Replies
6. Programming
Hello,
I have a project directory in /home/researcher
I have in my project/src three packages:A (contains the main class), B and C and I have 2 jar-files file1.jar file2.jar files in the project/my-jars
In Class A I import other classes from the other packages
I compiled as follows:... (4 Replies)
Discussion started by: chercheur857
4 Replies
7. Linux
Hi
How can I write a Java program to execute Linux commands? What is the best approach:
Invoking the Linux shell within Java and executing commands
or, using the Java APIs to do the stuff. Since it is platform independent, it'll know itself what to do. We need not check which OS the Java... (1 Reply)
Discussion started by: Dorothy
1 Replies
FREE(1) User Commands FREE(1)
NAME
free - Display amount of free and used memory in the system
SYNOPSIS
free [options]
DESCRIPTION
free displays the total amount of free and used physical and swap memory in the system, as well as the buffers and caches used by the ker-
nel. The information is gathered by parsing /proc/meminfo. The displayed columns are:
total Total installed memory (MemTotal and SwapTotal in /proc/meminfo)
used Used memory (calculated as total - free - buffers - cache)
free Unused memory (MemFree and SwapFree in /proc/meminfo)
shared Memory used (mostly) by tmpfs (Shmem in /proc/meminfo)
buffers
Memory used by kernel buffers (Buffers in /proc/meminfo)
cache Memory used by the page cache and slabs (Cached and SReclaimable in /proc/meminfo)
buff/cache
Sum of buffers and cache
available
Estimation of how much memory is available for starting new applications, without swapping. Unlike the data provided by the cache or
free fields, this field takes into account page cache and also that not all reclaimable memory slabs will be reclaimed due to items
being in use (MemAvailable in /proc/meminfo, available on kernels 3.14, emulated on kernels 2.6.27+, otherwise the same as free)
OPTIONS
-b, --bytes
Display the amount of memory in bytes.
-k, --kibi
Display the amount of memory in kibibytes. This is the default.
-m, --mebi
Display the amount of memory in mebibytes.
-g, --gibi
Display the amount of memory in gibibytes.
--tebi Display the amount of memory in tebibytes.
--pebi Display the amount of memory in pebibytes.
--kilo Display the amount of memory in kilobytes. Implies --si.
--mega Display the amount of memory in megabytes. Implies --si.
--giga Display the amount of memory in gigabytes. Implies --si.
--tera Display the amount of memory in terabytes. Implies --si.
--peta Display the amount of memory in petabytes. Implies --si.
-h, --human
Show all output fields automatically scaled to shortest three digit unit and display the units of print out. Following units are
used.
B = bytes
K = kibibyte
M = mebibyte
G = gibibyte
T = tebibyte
P = pebibyte
If unit is missing, and you have exbibyte of RAM or swap, the number is in tebibytes and columns might not be aligned with header.
-w, --wide
Switch to the wide mode. The wide mode produces lines longer than 80 characters. In this mode buffers and cache are reported in two
separate columns.
-c, --count count
Display the result count times. Requires the -s option.
-l, --lohi
Show detailed low and high memory statistics.
-s, --seconds delay
Continuously display the result delay seconds apart. You may actually specify any floating point number for delay using either .
or , for decimal point. usleep(3) is used for microsecond resolution delay times.
--si Use kilo, mega, giga etc (power of 1000) instead of kibi, mebi, gibi (power of 1024).
-t, --total
Display a line showing the column totals.
--help Print help.
-V, --version
Display version information.
FILES
/proc/meminfo
memory information
BUGS
The value for the shared column is not available from kernels before 2.6.32 and is displayed as zero.
Please send bug reports to
<procps@freelists.org>
SEE ALSO
ps(1), slabtop(1), top(1), vmstat(8).
procps-ng 2016-06-03 FREE(1)