@oranagra
hi, I'm running redis 4.0.12 in CentOS Linux release 7.4.1708 (Core). I have enabled active-defrag but it doesn't seem to do anything.
can you help me to find out why active-defrag doesn't run?

the follower is some example about the

info memory

used_memory:9823369872
used_memory_human:9.15G
used_memory_rss:27904212992
used_memory_rss_human:25.99G
used_memory_peak:27399710848
used_memory_peak_human:25.52G
used_memory_peak_perc:35.85%
used_memory_overhead:4061865096
used_memory_startup:3066944
used_memory_dataset:5761504776
used_memory_dataset_perc:58.67%
total_system_memory:404141654016
total_system_memory_human:376.39G
used_memory_lua:37888
used_memory_lua_human:37.00K
maxmemory:32212254720
maxmemory_human:30.00G
maxmemory_policy:volatile-lru
mem_fragmentation_ratio:2.84
mem_allocator:jemalloc-4.0.3
active_defrag_running:75

config

1) "active-defrag-threshold-lower"
2) "1"
3) "active-defrag-threshold-upper"
4) "100"
5) "active-defrag-ignore-bytes"
6) "1048576"
7) "active-defrag-cycle-min"
8) "25"
9) "active-defrag-cycle-max"
10) "75"
11) "activedefrag"
12) "yes"

debug log

59047:S 12 Nov 16:51:37.134 . allocated=9824517792, active=27259707392, resident=27925131264, frag=177% (184% rss), frag_bytes=17435189600 (18100613472% rss)
59047:S 12 Nov 16:51:38.876 . allocated=9824527664, active=27259756544, resident=27925131264, frag=177% (184% rss), frag_bytes=17435228880 (18100603600% rss)
59047:S 12 Nov 16:51:40.619 . allocated=9824527664, active=27259756544, resident=27925131264, frag=177% (184% rss), frag_bytes=17435228880 (18100603600% rss)

cat proc smaps info

01825000-01846000 rw-p 00000000 00:00 0 [heap]
Size: 132 kB
Rss: 56 kB
Pss: 56 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 56 kB
Referenced: 56 kB
Anonymous: 56 kB
AnonHugePages: 0 kB
Swap: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac sd
7f6b4ae00000-7f71e3c00000 rw-p 00000000 00:00 0
Size: 27670528 kB
Rss: 27243196 kB
Pss: 27243196 kB
Shared_Clean: 0 kB
Shared_Dirty: 0 kB
Private_Clean: 0 kB
Private_Dirty: 27243196 kB
Referenced: 27243196 kB
Anonymous: 27243196 kB
AnonHugePages: 0 kB
Swap: 0 kB
KernelPageSize: 4 kB
MMUPageSize: 4 kB
Locked: 0 kB
VmFlags: rd wr mr mw me ac sd

memory malloc-stats

127.0.0.1:11101> MEMORY MALLOC-STATS
___ Begin jemalloc statistics ___
Version: 4.0.3-0-ge9192eacf8935e29fc62fddc2701f7942b1cc02c
Assertions disabled
Run-time option settings:
opt.abort: false
opt.lg_chunk: 21
opt.dss: "secondary"
opt.narenas: 128
opt.lg_dirty_mult: 3 (arenas.lg_dirty_mult: 3)
opt.stats_print: false
opt.junk: "false"
opt.quarantine: 0
opt.redzone: false
opt.zero: false
opt.tcache: true
opt.lg_tcache_max: 15
CPUs: 32
Arenas: 128
Pointer size: 8
Quantum size: 8
Page size: 4096
Min active:dirty page ratio per arena: 8:1
Maximum thread-cached size class: 32768
Chunk size: 2097152 (2^21)
Allocated: 9824657832, active: 27259772928, metadata: 666136320, resident: 27925217280, mapped: 28343009280
Current active ceiling: 27260878848