Hi David,
On 8/26/18 11:18 PM, David Weeda wrote:
Hello,
We are upgrading our SAP Java Application servers to use SAP JVM 8.1
Patch Collection 39. This release integrates updates from Oracle JDK 8u172
The GC shall be switched from -XX:+UseConcMarkSweepGC to -XX:+UseG1GC.
On the following website:-
https://docs.oracle.com/javase/8/docs/technotes/guides/vm/performance-enhancements-7.html#numa
There is a note on NUMA Collector Enhancements for the Parallel
Scavenger garbage collector. Are the subsequent collectors, namely the
G1 garbage collector also NUMA aware?
No, G1 is not NUMA aware. Only Parallel GC(-XX:+UseParallelGC) has NUMA
awareness.
Is it default?
If you are asking UseNUMA option is by default for G1GC, no UseNUMA is
always false by default.
May I use the -XX:+UseNUMA flag with -XX:+UseG1GC?
Yes, you can use +UseNUMA with +UseG1GC.
G1 algorithm is not NUMA aware, but with UseNUMA enabled, we can get
NUMA interleaving. i.e. Interleave memory across NUMA nodes if possible
and this would give some benefits on NUMA system.
FYI, UseNUMAInterleaving(false by default) command-line option will be
automatically enabled if UseNUMA is enabled.
HTH,
Sangheon
Regards,
*David Weeda*
*SAP Technical Architect | Enterprise Systems | Information Technology
Directorate *
Level 11, 8 Central Ave | Eveleigh NSW 2015 | |(:+61 (0)4 8822 0280 |
*: david.we...@det.nsw.edu.au <mailto:david.we...@det.nsw.edu.au> |
_www.dec.nsw.gov.au <http://www.dec.nsw.gov.au/>_
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