On Tue, Mar 31, 2020 at 10:57 PM o haya <ohaya1...@gmail.com> wrote:
> I think I figured out what is going on. I think that the parameters were
> working all right, but the memory that is shown by the "free" command isn't
> corresponding to the JVM memory.
[ snip ]
You beat me to the punch. Linux "free" cannot be used reliably in some
situations, esp with Java.
(BTW, I hope you're not running TC as the root user.
I see references to the root user in your CLI output)
You could use the visual (GUI) tools, such as "jvisualvm" or "Mission
Control" (jmc).
Both of these provide a wealth of JVM memory usage, including GC.
You could also query for the info at the command line
* using "jps -lvm" (NOTE: this is without the facility of JMX)
* you could run: java -XX:+PrintFlagsFinal -version | grep -iE
'HeapSize|PermSize|ThreadStackSize'
for example (output)
user@stimpy:~/bin/jdk180-221/bin> java -XX:+PrintFlagsFinal -version |
grep -iE 'HeapSize|PermSize|ThreadStackSize'
intx CompilerThreadStackSize = 1024
{pd product} {default}
size_t ErgoHeapSizeLimit = 0
{product} {default}
size_t HeapSizePerGCThread = 43620760
{product} {default}
size_t InitialHeapSize = 1052770304
{product} {ergonomic}
size_t LargePageHeapSizeThreshold = 134217728
{product} {default}
size_t MaxHeapSize = 16835936256
{product} {ergonomic}
uintx NonNMethodCodeHeapSize = 7594288
{pd product} {ergonomic}
uintx NonProfiledCodeHeapSize = 122031976
{pd product} {ergonomic}
uintx ProfiledCodeHeapSize = 122031976
{pd product} {ergonomic}
intx ThreadStackSize = 1024
{pd product} {default}
intx VMThreadStackSize = 1024
{pd product} {default}
openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment (build 11.0.6+10-suse-2.1-x8664)
OpenJDK 64-Bit Server VM (build 11.0.6+10-suse-2.1-x8664, mixed mode)
user@stimpy:~/bin/jdk180-221/bin>
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