[Gluster-devel] Memory leak in GlusterFS FUSE client

Oleksandr Natalenko oleksandr at natalenko.name
Thu Dec 24 15:47:17 UTC 2015


Another addition: it seems to be GlusterFS API library memory leak 
because NFS-Ganesha also consumes huge amount of memory while doing 
ordinary "find . -type f" via NFSv4.2 on remote client. Here is memory 
usage:

===
root      5416 34.2 78.5 2047176 1480552 ?     Ssl  12:02 117:54 
/usr/bin/ganesha.nfsd -L /var/log/ganesha.log -f 
/etc/ganesha/ganesha.conf -N NIV_EVENT
===

1.4G is too much for simple stat() :(.

Ideas?

24.12.2015 16:32, Oleksandr Natalenko написав:
> 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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