[Gluster-devel] [Gluster-users] Memory leak in GlusterFS FUSE client

Oleksandr Natalenko oleksandr at natalenko.name
Fri Dec 25 15:26:23 UTC 2015


What units Cache_Size is measured in? Bytes?

25.12.2015 16:58, Soumya Koduri написав:
> On 12/24/2015 09:17 PM, Oleksandr Natalenko wrote:
>> 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?
> nfs-ganesha also has cache layer which can scale to millions of
> entries depending on the number of files/directories being looked
> upon. However there are parameters to tune it. So either try stat with
> few entries or add below block in nfs-ganesha.conf file, set low
> limits and check the difference. That may help us narrow down how much
> memory actually consumed by core nfs-ganesha and gfAPI.
> 
> CACHEINODE {
> 	Cache_Size(uint32, range 1 to UINT32_MAX, default 32633); # cache size
> 	Entries_HWMark(uint32, range 1 to UINT32_MAX, default 100000); #Max
> no. of entries in the cache.
> }
> 
> Thanks,
> Soumya
> 
>> 
>> 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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