[TriLUG] Memory Monitor on a Redhat system

[Tom Le]

Sorry...I've been so busy with other stuff and have not had time to
work on this ... anyway, this is from /proc/meminfo

# cat /proc/meminfo
MemTotal:     16053064 kB
MemFree:         50312 kB
Buffers:        361476 kB
Cached:       11939288 kB
SwapCached:       7900 kB
Active:        9351852 kB
Inactive:      6222640 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:     16053064 kB
LowFree:         50312 kB
SwapTotal:    10485720 kB
SwapFree:     10212028 kB
Dirty:             464 kB
Writeback:           0 kB
Mapped:        4968184 kB
Slab:           392296 kB
Committed_AS: 13508612 kB
PageTables:     151168 kB
VmallocTotal: 2147483647 kB
VmallocUsed:      9376 kB
VmallocChunk: 2147472663 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:    16384 kB

 actual used memory = 3.5 G

jboss did not give any error message - it would just not start and I
think it's because of (out-of) memory problem.

This is the options for jvm: "-server -Xverify:none -Xms1024m -Xmx2560m"
jboss is probably caching all the memory; and if that is the case,
would anyone suggest how to flush the cache?
The machine is 64-bit and we are running IBM jdk 1.5 for ppc64

On 3/29/07, Robert Dale <robdale at gmail.com> wrote:
> On 3/29/07, Tom Le <t.thanhcle at gmail.com> wrote:
> > We are having problems with memory usage on a Redhat AS 4 - on a
> > 64-bit Power PC IBM pSeries. We was wondering if there is a reliable
> > package to monitor memory usage on the server. Our current problem is
> > that the system memory is 95% capacity and we have no idea what is
> > taking up all the memory. We are certain that oracle is using 1G out
> > of 16G of the box, and one instance of jboss is set to use max 1G of
> > memory. We are trying to add a second instance of jboss and it won't
> > start due to insufficient memory. We need a package or a way to drill
> > down to what application using how much memory on the server
> > Any suggestion is appreciated.
>
> When you say at 95% capacity is that including buffers and cache?
>
> What's your actual memory usage?  (/proc/meminfo would be useful here)
> MemTotal - MemFree - Buffers - Cached = actual used memory
>
> What's the actual jboss error message?  Do you have the jvm stacktrace?
> What jvm are you using?  What jvm options are you starting jboss with?
>
> --
> Robert Dale
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