Further background on the environment: There are 36 cores, with a total size of 131 MB (based on the size reported by "Master (Searching)" in the web console).
The Java memory parameters in use are: -Xms512m -Xmx512m. > > On 14 February 2017 at 05:45 Erick Erickson <erickerick...@gmail.com> > wrote: > > GCViewer is a nifty tool for visualizing the GC activity BTW. > I don't know what I'm looking for but for a log covering a 3-hour period today the "Summary" tab says (typed manually, apologies for any mistakes): Total heap (usage / alloc. max): 490.7M (100.0%) / 490.7M Max heap after conc GC: 488.7M (99.6%) Max tenured after conc GC: 382M (99.5% / 77.9%) Max heap after full GC: 490M (99.9%) Freed Memory: 141,811.4M Freed Mem/Min: 748.554M/min Total Time: 3h9m26s Accumulated pauses: 883.6s Throughput: 92.23% Number of full gc pauses: 476 Full GC Performance: 101.4M/s Number of gc pauses: 15153 GC Performance: 245.5M/s "Memory" tab: Total heap (usage / alloc. max): 490.7M (100.0%) / 490.7M Tenured heap (usage / alloc. max): 384M (100.0%) / 384M Young heap (usage / alloc. max): 106.7M (100.0%) / 106.7M Perm heap (usage / alloc. max): 205.6M (17.0%) / 1,212M Max tenured after conc GC: 382M (99.5% / 77.9%) Avg tenured after conc GC: 247.5M (delta=17.612M) Max heap after conc GC: 488.7M (99.6%) Avg heap after conc GC: 252.6M (delta=35.751M) Max heap after full GC: 490M (99.9%) Avg heap after full GC: 379M (delta=72.917M) Avg after GC: 359.9M (delta=40.965M) Freed by full GC: 47,692.8M (33.6%) Freed by GC: 94,118.7M (66.4%) Avg freed full GC: 100.2M/coll (delta=68.015M) [greyed] Avg freed GC: 6,360.3K/coll (delta=19.963M) [greyed] Avg rel inc after FGC: -199,298B/coll Avg rel inc after GC: 6,360.3K/coll (delta=19.963M) Slope full GC: -126,380B/s Slope GC: 14.317M/s InitiatingOccFraction (avg / max): 65.9% / 100.0% Avg promotion: 2,215.324K/coll (delta=6,904.174K) [greyed] Total promotion: 12,504.467M Can anyone can shed any light on this? Is it a problem or is this all normal? Thanks, Leon Stringer
