[Gluster-devel] Memory leak in GlusterFS FUSE client

Oleksandr Natalenko oleksandr at natalenko.name
Thu Dec 24 14:32:33 UTC 2015


Still actual issue for 3.7.6. Any suggestions?

24.09.2015 10:14, Oleksandr Natalenko написав:
> In our GlusterFS deployment we've encountered something like memory
> leak in GlusterFS FUSE client.
> 
> We use replicated (×2) GlusterFS volume to store mail (exim+dovecot,
> maildir format). Here is inode stats for both bricks and mountpoint:
> 
> ===
> Brick 1 (Server 1):
> 
> Filesystem                                             Inodes    IUsed
>      IFree IUse% Mounted on
> /dev/mapper/vg_vd1_misc-lv08_mail                   578768144 10954918
>  567813226    2% /bricks/r6sdLV08_vd1_mail
> 
> Brick 2 (Server 2):
> 
> Filesystem                                             Inodes    IUsed
>      IFree IUse% Mounted on
> /dev/mapper/vg_vd0_misc-lv07_mail                   578767984 10954913
>  567813071    2% /bricks/r6sdLV07_vd0_mail
> 
> Mountpoint (Server 3):
> 
> Filesystem                              Inodes    IUsed      IFree
> IUse% Mounted on
> glusterfs.xxx:mail                   578767760 10954915  567812845
> 2% /var/spool/mail/virtual
> ===
> 
> glusterfs.xxx domain has two A records for both Server 1 and Server 2.
> 
> Here is volume info:
> 
> ===
> Volume Name: mail
> Type: Replicate
> Volume ID: f564e85c-7aa6-4170-9417-1f501aa98cd2
> Status: Started
> Number of Bricks: 1 x 2 = 2
> Transport-type: tcp
> Bricks:
> Brick1: server1.xxx:/bricks/r6sdLV08_vd1_mail/mail
> Brick2: server2.xxx:/bricks/r6sdLV07_vd0_mail/mail
> Options Reconfigured:
> nfs.rpc-auth-allow: 1.2.4.0/24,4.5.6.0/24
> features.cache-invalidation-timeout: 10
> performance.stat-prefetch: off
> performance.quick-read: on
> performance.read-ahead: off
> performance.flush-behind: on
> performance.write-behind: on
> performance.io-thread-count: 4
> performance.cache-max-file-size: 1048576
> performance.cache-size: 67108864
> performance.readdir-ahead: off
> ===
> 
> Soon enough after mounting and exim/dovecot start, glusterfs client
> process begins to consume huge amount of RAM:
> 
> ===
> user at server3 ~$ ps aux | grep glusterfs | grep mail
> root     28895 14.4 15.0 15510324 14908868 ?   Ssl  Sep03 4310:05
> /usr/sbin/glusterfs --fopen-keep-cache --direct-io-mode=disable
> --volfile-server=glusterfs.xxx --volfile-id=mail
> /var/spool/mail/virtual
> ===
> 
> That is, ~15 GiB of RAM.
> 
> Also we've tried to use mountpoint withing separate KVM VM with 2 or 3
> GiB of RAM, and soon after starting mail daemons got OOM killer for
> glusterfs client process.
> 
> Mounting same share via NFS works just fine. Also, we have much less
> iowait and loadavg on client side with NFS.
> 
> Also, we've tried to change IO threads count and cache size in order
> to limit memory usage with no luck. As you can see, total cache size
> is 4×64==256 MiB (compare to 15 GiB).
> 
> Enabling-disabling stat-prefetch, read-ahead and readdir-ahead didn't
> help as well.
> 
> Here are volume memory stats:
> 
> ===
> Memory status for volume : mail
> ----------------------------------------------
> Brick : server1.xxx:/bricks/r6sdLV08_vd1_mail/mail
> Mallinfo
> --------
> Arena    : 36859904
> Ordblks  : 10357
> Smblks   : 519
> Hblks    : 21
> Hblkhd   : 30515200
> Usmblks  : 0
> Fsmblks  : 53440
> Uordblks : 18604144
> Fordblks : 18255760
> Keepcost : 114112
> 
> Mempool Stats
> -------------
> Name                            HotCount ColdCount PaddedSizeof
> AllocCount MaxAlloc   Misses Max-StdAlloc
> ----                            -------- --------- ------------
> ---------- -------- -------- ------------
> mail-server:fd_t                       0      1024          108
> 30773120      137        0            0
> mail-server:dentry_t               16110       274           84
> 235676148    16384  1106499         1152
> mail-server:inode_t                16363        21          156
> 237216876    16384  1876651         1169
> mail-trash:fd_t                        0      1024          108
>   0        0        0            0
> mail-trash:dentry_t                    0     32768           84
>   0        0        0            0
> mail-trash:inode_t                     4     32764          156
>   4        4        0            0
> mail-trash:trash_local_t               0        64         8628
>   0        0        0            0
> mail-changetimerecorder:gf_ctr_local_t         0        64
> 16540          0        0        0            0
> mail-changelog:rpcsvc_request_t         0         8         2828
>    0        0        0            0
> mail-changelog:changelog_local_t         0        64          116
>     0        0        0            0
> mail-bitrot-stub:br_stub_local_t         0       512           84
> 79204        4        0            0
> mail-locks:pl_local_t                  0        32          148
> 6812757        4        0            0
> mail-upcall:upcall_local_t             0       512          108
>   0        0        0            0
> mail-marker:marker_local_t             0       128          332
> 64980        3        0            0
> mail-quota:quota_local_t               0        64          476
>   0        0        0            0
> mail-server:rpcsvc_request_t           0       512         2828
> 45462533       34        0            0
> glusterfs:struct saved_frame           0         8          124
>   2        2        0            0
> glusterfs:struct rpc_req               0         8          588
>   2        2        0            0
> glusterfs:rpcsvc_request_t             1         7         2828
>   2        1        0            0
> glusterfs:log_buf_t                    5       251          140
> 3452        6        0            0
> glusterfs:data_t                     242     16141           52
> 480115498      664        0            0
> glusterfs:data_pair_t                230     16153           68
> 179483528      275        0            0
> glusterfs:dict_t                      23      4073          140
> 303751675      627        0            0
> glusterfs:call_stub_t                  0      1024         3764
> 45290655       34        0            0
> glusterfs:call_stack_t                 1      1023         1708
> 43598469       34        0            0
> glusterfs:call_frame_t                 1      4095          172
> 336219655      184        0            0
> ----------------------------------------------
> Brick : server2.xxx:/bricks/r6sdLV07_vd0_mail/mail
> Mallinfo
> --------
> Arena    : 38174720
> Ordblks  : 9041
> Smblks   : 507
> Hblks    : 21
> Hblkhd   : 30515200
> Usmblks  : 0
> Fsmblks  : 51712
> Uordblks : 19415008
> Fordblks : 18759712
> Keepcost : 114848
> 
> Mempool Stats
> -------------
> Name                            HotCount ColdCount PaddedSizeof
> AllocCount MaxAlloc   Misses Max-StdAlloc
> ----                            -------- --------- ------------
> ---------- -------- -------- ------------
> mail-server:fd_t                       0      1024          108
> 2373075      133        0            0
> mail-server:dentry_t               14114      2270           84
> 3513654    16384     2300          267
> mail-server:inode_t                16374        10          156
> 6766642    16384   194635         1279
> mail-trash:fd_t                        0      1024          108
>   0        0        0            0
> mail-trash:dentry_t                    0     32768           84
>   0        0        0            0
> mail-trash:inode_t                     4     32764          156
>   4        4        0            0
> mail-trash:trash_local_t               0        64         8628
>   0        0        0            0
> mail-changetimerecorder:gf_ctr_local_t         0        64
> 16540          0        0        0            0
> mail-changelog:rpcsvc_request_t         0         8         2828
>    0        0        0            0
> mail-changelog:changelog_local_t         0        64          116
>     0        0        0            0
> mail-bitrot-stub:br_stub_local_t         0       512           84
> 71354        4        0            0
> mail-locks:pl_local_t                  0        32          148
> 8135032        4        0            0
> mail-upcall:upcall_local_t             0       512          108
>   0        0        0            0
> mail-marker:marker_local_t             0       128          332
> 65005        3        0            0
> mail-quota:quota_local_t               0        64          476
>   0        0        0            0
> mail-server:rpcsvc_request_t           0       512         2828
> 12882393       30        0            0
> glusterfs:struct saved_frame           0         8          124
>   2        2        0            0
> glusterfs:struct rpc_req               0         8          588
>   2        2        0            0
> glusterfs:rpcsvc_request_t             1         7         2828
>   2        1        0            0
> glusterfs:log_buf_t                    5       251          140
> 3443        6        0            0
> glusterfs:data_t                     242     16141           52
> 138743429      290        0            0
> glusterfs:data_pair_t                230     16153           68
> 126649864      270        0            0
> glusterfs:dict_t                      23      4073          140
> 20356289       63        0            0
> glusterfs:call_stub_t                  0      1024         3764
> 13678560       31        0            0
> glusterfs:call_stack_t                 1      1023         1708
> 11011561       30        0            0
> glusterfs:call_frame_t                 1      4095          172
> 125764190      193        0            0
> ----------------------------------------------
> ===
> 
> So, my questions are:
> 
> 1) what one should do to limit GlusterFS FUSE client memory usage?
> 2) what one should do to prevent client high loadavg because of high
> iowait because of multiple concurrent volume users?
> 
> Server/client OS is CentOS 7.1, GlusterFS server version is 3.7.3,
> GlusterFS client version is 3.7.4.
> 
> Any additional info needed?


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