Hi Not familiar with pmap, but G1GC is not recommended for such a big heap.
To troubleshoot further, I usually run jmp -histo to get a list of top objects that use the most memory heap. On Mon, Aug 1, 2022 at 3:08 AM Micro dong <[email protected]> wrote: > > we deploy hdfs in our company. we meet a unormal situation. > we set heap memory to 280G, but we actually consume 450G. > > *we seen this by pmap.* > > > > > > > > > > > > * 2ae91c000000 rw-p 00000000 00:00 0 294174720 293705824 > 293705824 293705824 293705824 0 0 0198c000 rw-p 00000000 > 00:00 0 173517492 173513320 173513320 173513320 173513320 0 > 0 [heap] 2b2fa8000000 rw-p 00000000 00:00 0 11026824 > 11007512 11007512 11007512 11007512 0 0 2b2f62000000 rw-p > 00000000 00:00 0 1146880 1014280 1014280 1014280 > 1014280 0 0 2ae9072b0000 rwxp 00000000 00:00 0 > 71808 69280 69280 69280 69280 0 0 2ae917d88000 > rw-p 00000000 00:00 0 25696 24700 24700 24700 > 24700 0 0 2b325732f000 rw-p 00000000 00:00 0 16384 > 16328 16328 16328 16328 0 0 2ae91aeb9000 rw-p > 00000000 00:00 0 9988 8972 8972 8972 > 8972 0 0 2b3249063000 rw-p 00000000 00:00 0 9216 > 8204 8204 8204 8204 0 0 2ae905332000 r-xp > 00000000 08:02 8391747 13168 6808 2825 6804 > 0 0 0 libjvm.so* > > > * additional information:* > *hadoop version: 2.7.2* > * -Xms280G * > *-Xmx280G * > *-XX:MaxDirectMemorySize=10G * > *-XX:MetaspaceSize=128M* > *-XX:+UseG1GC* > > any idea will be appreciated >
