If you have a memory limit of 2MB, and start uploading 3 1MB objects, the third one will cause an out of memory error.
During upload a free object is pulled to be written into. If you are actively writing to, or actively reading from + writing to, more objects than are available for it to reserve, it'll bail with an OOM error. It's only able to look at the tail for this, so it's more common with large objects. The latest version has some workarounds which improve the situation but nothing can really "fix" it without allowing it to scan the full list or using temporary buffers. Were there issues with the latest version? On Wed, 25 Sep 2013, Bill Moseley wrote: > What is Memcached doing that is causing it to generate SERVER_ERROR out of > memory storing object? Is that a malloc error? What stats can I look > at to understand why this is happening? > I'm running 1.4.4 memcached -m 4096 -c 8192 on a machine with 8GB RAM. Top > says it has 4GB resident on CentOS 6.2. > > I have a script that is forking and sending 1MB sets to unique keys and I see > the out of memory errors. > > BTW -- I have another CentOS 6.2 with 64GB also 1.4.4 where I start with > "memcached -m 4096" and cannot make it happen. (Although the md5sums for > the two binaries are different for some reason.) > > > I'm curious about this stat: > > STAT total_malloced 8,590,762,448 (my commas) > > > Total amount of memory allocated to slab pages. > Is that the problem? But -m is set to 4096. > > stats settings > STAT maxbytes 0 > STAT maxconns 8192 > STAT tcpport 11211 > STAT udpport 11211 > STAT inter NULL > STAT verbosity 0 > STAT oldest 0 > STAT evictions on > STAT domain_socket NULL > STAT umask 700 > STAT growth_factor 1.25 > STAT chunk_size 48 > STAT num_threads 4 > STAT stat_key_prefix : > STAT detail_enabled no > STAT reqs_per_event 20 > STAT cas_enabled yes > STAT tcp_backlog 1024 > STAT binding_protocol auto-negotiate > STAT auth_enabled_sasl no > STAT item_size_max 1048576 > END > > > > $ (echo stats items; echo quit) | netcat 10.35.1.94 11211 | grep outofmemory > STAT items:1:outofmemory 0 > STAT items:2:outofmemory 0 > STAT items:3:outofmemory 0 > STAT items:4:outofmemory 0 > STAT items:5:outofmemory 0 > STAT items:6:outofmemory 0 > STAT items:7:outofmemory 0 > STAT items:8:outofmemory 0 > STAT items:9:outofmemory 0 > STAT items:10:outofmemory 0 > STAT items:11:outofmemory 0 > STAT items:12:outofmemory 0 > STAT items:13:outofmemory 0 > STAT items:14:outofmemory 0 > STAT items:15:outofmemory 0 > STAT items:16:outofmemory 0 > STAT items:17:outofmemory 0 > STAT items:18:outofmemory 0 > STAT items:19:outofmemory 0 > STAT items:20:outofmemory 0 > STAT items:21:outofmemory 0 > STAT items:22:outofmemory 0 > STAT items:23:outofmemory 0 > STAT items:24:outofmemory 0 > STAT items:25:outofmemory 0 > STAT items:26:outofmemory 0 > STAT items:27:outofmemory 0 > STAT items:28:outofmemory 0 > STAT items:29:outofmemory 0 > STAT items:30:outofmemory 0 > STAT items:31:outofmemory 0 > STAT items:32:outofmemory 0 > STAT items:33:outofmemory 0 > STAT items:34:outofmemory 0 > STAT items:35:outofmemory 0 > STAT items:36:outofmemory 0 > STAT items:37:outofmemory 0 > STAT items:38:outofmemory 0 > STAT items:39:outofmemory 0 > STAT items:40:outofmemory 0 > STAT items:41:outofmemory 0 > STAT items:42:outofmemory 0 > > > stats slabs > STAT 1:chunk_size 96 > STAT 1:chunks_per_page 10922 > STAT 1:total_pages 1 > STAT 1:total_chunks 10922 > STAT 1:used_chunks 7 > STAT 1:free_chunks 8 > STAT 1:free_chunks_end 10907 > STAT 1:mem_requested 18446744073709550798 > STAT 1:get_hits 48561 > STAT 1:cmd_set 35887 > STAT 1:delete_hits 0 > STAT 1:incr_hits 0 > STAT 1:decr_hits 0 > STAT 1:cas_hits 0 > STAT 1:cas_badval 0 > STAT 2:chunk_size 120 > STAT 2:chunks_per_page 8738 > STAT 2:total_pages 625 > STAT 2:total_chunks 5461250 > STAT 2:used_chunks 5461249 > STAT 2:free_chunks 1 > STAT 2:free_chunks_end 0 > STAT 2:mem_requested 2018891193 > STAT 2:get_hits 22305549989 > STAT 2:cmd_set 6257109186 > STAT 2:delete_hits 1 > STAT 2:incr_hits 0 > STAT 2:decr_hits 0 > STAT 2:cas_hits 0 > STAT 2:cas_badval 0 > STAT 3:chunk_size 152 > STAT 3:chunks_per_page 6898 > STAT 3:total_pages 5164 > STAT 3:total_chunks 35621272 > STAT 3:used_chunks 35615218 > STAT 3:free_chunks 6054 > STAT 3:free_chunks_end 0 > STAT 3:mem_requested 5042960945 > STAT 3:get_hits 52627536 > STAT 3:cmd_set 832629765 > STAT 3:delete_hits 20814 > STAT 3:incr_hits 0 > STAT 3:decr_hits 0 > STAT 3:cas_hits 0 > STAT 3:cas_badval 0 > STAT 4:chunk_size 192 > STAT 4:chunks_per_page 5461 > STAT 4:total_pages 98 > STAT 4:total_chunks 535178 > STAT 4:used_chunks 535178 > STAT 4:free_chunks 0 > STAT 4:free_chunks_end 0 > STAT 4:mem_requested 18446744073444110870 > STAT 4:get_hits 3951361 > STAT 4:cmd_set 426309882 > STAT 4:delete_hits 301012 > STAT 4:incr_hits 0 > STAT 4:decr_hits 0 > STAT 4:cas_hits 0 > STAT 4:cas_badval 0 > STAT 5:chunk_size 240 > STAT 5:chunks_per_page 4369 > STAT 5:total_pages 1 > STAT 5:total_chunks 4369 > STAT 5:used_chunks 4361 > STAT 5:free_chunks 8 > STAT 5:free_chunks_end 0 > STAT 5:mem_requested 18446744073703660821 > STAT 5:get_hits 208048 > STAT 5:cmd_set 27841509 > STAT 5:delete_hits 56459 > STAT 5:incr_hits 0 > STAT 5:decr_hits 0 > STAT 5:cas_hits 0 > STAT 5:cas_badval 0 > STAT 6:chunk_size 304 > STAT 6:chunks_per_page 3449 > STAT 6:total_pages 1 > STAT 6:total_chunks 3449 > STAT 6:used_chunks 3442 > STAT 6:free_chunks 7 > STAT 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2500 > STAT 41:cmd_set 8652917 > STAT 41:delete_hits 135104 > STAT 41:incr_hits 0 > STAT 41:decr_hits 0 > STAT 41:cas_hits 0 > STAT 41:cas_badval 0 > STAT 42:chunk_size 1048576 > STAT 42:chunks_per_page 1 > STAT 42:total_pages 447 > STAT 42:total_chunks 447 > STAT 42:used_chunks 53 > STAT 42:free_chunks 394 > STAT 42:free_chunks_end 0 > STAT 42:mem_requested 5596958197 > STAT 42:get_hits 18048 > STAT 42:cmd_set 49072586 > STAT 42:delete_hits 816311 > STAT 42:incr_hits 0 > STAT 42:decr_hits 0 > STAT 42:cas_hits 0 > STAT 42:cas_badval 0 > STAT active_slabs 42 > STAT total_malloced 8590762448 > END > > > -- > Bill Moseley > mose...@hank.org > > -- > > --- > You received this message because you are subscribed to the Google Groups > "memcached" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to memcached+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > -- --- You received this message because 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