Hillel Bilman ha scritto:
Hi,
We are using james-2.3.1 on Linux 64 bit Redhat with 8GB of RAM.
Using free:
total used free shared
buffers cached
Mem: 8174276 8129120 45156 0 2696 42560
-/+ buffers/cache: 8083864 90412
Swap: 16386248 8255480 8130768
We stopped James and now there is 7856744 memory available.
This means the server starts to go slowly.
Using free:
total used free shared
buffers cached
Mem: 8174276 374404 7799872 0 3500 53372
-/+ buffers/cache: 317532 7856744
Swap: 16386248 915912 15470336
If one of our mailets throws an exception could that cause it?
Why does this happen? How can we prevent it?
1st: memory consumption for a linux tool is not measured with "free".
Free tells you the memory used by the operating system as a whole.
Please check the memory with "ps", first and tell us what you see.
2nd: it is the normal behaviour for linux to use all of the memory you
have because it uses the free memory as a cache when it understand it is
not used by programs.
3rd: a java program will never use 8GB unless you configured java to use
so much memory. The default Xmx (maximum heap size) for a java program
depends on the JVM and the platform but I guess it never is more than
256MB, so if you didn't alter the Xmx manually it is impossible for
james to use 8gb.
4th: whenever you set a larger -Xmx then java will be allowed to use
more memory and in case it will need once the memory will be allocated
by java and never returned to the OS.
5th: you can get an heap dump from the james jvm just before stopping it
to understand what there is in the JVM memory ("jheap" if you are on a
recent jvm).
I guess there's a lot for you to think and reply before I go on with
more points.
Stefano
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