Confluence server not responsive

Question

I migrate the confluence to a new server and after that it is always not responsive with the log as follow:

2018-10-26T19:14:01.020+0800: 53.819: [GC concurrent-root-region-scan-start]
2018-10-26T19:14:01.052+0800: 53.849: [GC concurrent-root-region-scan-end, 0.0307610 secs]
2018-10-26T19:14:01.052+0800: 53.849: [GC concurrent-mark-start]
2018-10-26T19:14:01.270+0800: 54.080: [GC concurrent-mark-end, 0.2311611 secs]
2018-10-26T19:14:01.270+0800: 54.081: [GC remark, 0.0192365 secs]
2018-10-26T19:14:01.302+0800: 54.100: [GC cleanup 588M->269M(1024M), 0.0020686 secs]
2018-10-26T19:14:01.302+0800: 54.102: [GC concurrent-cleanup-start]
2018-10-26T19:14:01.302+0800: 54.103: [GC concurrent-cleanup-end, 0.0005284 secs]
2018-10-26T19:14:01.911+0800: 54.715: [GC pause (G1 Evacuation Pause) (young) 430M->218M(1024M), 0.0538949 secs]
2018-10-26T19:14:02.036+0800: 54.843: [GC pause (G1 Evacuation Pause) (mixed) 235M->191M(1024M), 0.0384126 secs]
2018-10-26T19:14:03.973+0800: 56.780: [GC pause (G1 Evacuation Pause) (young) 719M->258M(1024M), 0.0758591 secs]
2018-10-26T19:14:05.677+0800: 58.489: [GC pause (G1 Evacuation Pause) (young) 728M->326M(1024M), 0.1028561 secs]
2018-10-26T19:14:07.380+0800: 60.187: [GC pause (G1 Evacuation Pause) (young) 733M->363M(1024M), 0.1025721 secs]

Could you please help me figure out what the problem is and how to resolve it?

Thanks very much!

roman_l0djep · Answer

Hi @Zun Li,

do you see these statements in the Confluence log? If this is Catalina logs, can you please share the log from Confluence: any errors there, does the browser hang with "waiting for reply" or it shows that there is no response from the page?

Roman.

Tobias Anstett (K15t) · Answer

Hi Zun Li,

Looks like your server is dealing with GC (garbage collection) – referring to the log timestamps a little bit more than 6sec.

A good resource to learn how to tweak your GC is available here: https://confluence.atlassian.com/enterprise/garbage-collection-gc-tuning-guide-461504616.html

Furthermore please check if your server is meeting the Confluence system requirements - especially the hardware part (CPU and memory) – https://confluence.atlassian.com/doc/system-requirements-126517514.html

Best, Tobias