malloc storage memory leak?

Cal Heldenbrand cal at fbsdata.com
Thu Jul 19 23:11:20 CEST 2012


Sure no problem.  I'll show a few more details below too.  For a quick
rundown of my application, I'm placing varnish in front of a big mapping
system.  We have about 22TB in mapping tiles, and I have 4 varnish machines
sitting in front of them, with 6GB of memory each.  A load balancer
distributes the zoom levels between two clusters (two members each) in an
attempt to balance my hit ratio and hit traffic.  It works pretty well, the
LRU seems to keep my hit ratio at around 60%.  Which still results in very
quick map loads for most views.  I was previously using the *file* storage,
but it just doesn't make sense to stick with that in my application.  The
backend NFS server is quicker than the VM images that varnish is running
on, so I decided to try out the malloc storage and ran into this problem.


Here's a screenshot of top.  This machine was set to malloc max at 5500MB.
[image: Inline image 1]

Here's a cacti graph of me trying to lower the malloc size the last few
days.  Even set at 4000MB it climbs up to 6GB and crashes the box

[image: Inline image 1]

Here's the output of varnishstat -1 on a machine during the time when it
started to swap out.  (IP addresses removed)
---------------------------------------------------------------------------------------------------------------------------------------------------
# varnishstat -1
client_conn            4516253        24.35 Client connections accepted
client_drop                  0         0.00 Connection dropped, no sess/wrk
client_req             9665270        52.10 Client requests received
cache_hit              8866434        47.80 Cache hits
cache_hitpass                0         0.00 Cache hits for pass
cache_miss              798835         4.31 Cache misses
backend_conn             96001         0.52 Backend conn. success
backend_unhealthy            0         0.00 Backend conn. not attempted
backend_busy                 0         0.00 Backend conn. too many
backend_fail                 5         0.00 Backend conn. failures
backend_reuse           702842         3.79 Backend conn. reuses
backend_toolate          95484         0.51 Backend conn. was closed
backend_recycle         798339         4.30 Backend conn. recycles
backend_retry                7         0.00 Backend conn. retry
fetch_head                   0         0.00 Fetch head
fetch_length            638890         3.44 Fetch with Length
fetch_chunked           159945         0.86 Fetch chunked
fetch_eof                    0         0.00 Fetch EOF
fetch_bad                    0         0.00 Fetch had bad headers
fetch_close                  0         0.00 Fetch wanted close
fetch_oldhttp                0         0.00 Fetch pre HTTP/1.1 closed
fetch_zero                   0         0.00 Fetch zero len
fetch_failed                 0         0.00 Fetch failed
fetch_1xx                    0         0.00 Fetch no body (1xx)
fetch_204                    0         0.00 Fetch no body (204)
fetch_304                    0         0.00 Fetch no body (304)
n_sess_mem                 512          .   N struct sess_mem
n_sess                     318          .   N struct sess
n_object                798209          .   N struct object
n_vampireobject              0          .   N unresurrected objects
n_objectcore            798256          .   N struct objectcore
n_objecthead            798256          .   N struct objecthead
n_waitinglist             2017          .   N struct waitinglist
n_vbc                       15          .   N struct vbc
n_wrk                       49          .   N worker threads
n_wrk_create              1039         0.01 N worker threads created
n_wrk_failed                 0         0.00 N worker threads not created
n_wrk_max                 3421         0.02 N worker threads limited
n_wrk_lqueue                 0         0.00 work request queue length
n_wrk_queued             20376         0.11 N queued work requests
n_wrk_drop                   0         0.00 N dropped work requests
n_backend                    8          .   N backends
n_expired                  626          .   N expired objects
n_lru_nuked                  0          .   N LRU nuked objects
n_lru_moved            2011016          .   N LRU moved objects
losthdr                      0         0.00 HTTP header overflows
n_objsendfile                0         0.00 Objects sent with sendfile
n_objwrite             9650020        52.02 Objects sent with write
n_objoverflow                0         0.00 Objects overflowing workspace
s_sess                 4516229        24.35 Total Sessions
s_req                  9665270        52.10 Total Requests
s_pipe                       1         0.00 Total pipe
s_pass                       0         0.00 Total pass
s_fetch                 798835         4.31 Total fetch
s_hdrbytes          3810296042     20540.68 Total header bytes
s_bodybytes        67134175568    361909.30 Total body bytes
sess_closed             121965         0.66 Session Closed
sess_pipeline                0         0.00 Session Pipeline
sess_readahead               0         0.00 Session Read Ahead
sess_linger            9634396        51.94 Session Linger
sess_herd              9535551        51.40 Session herd
shm_records          459505182      2477.12 SHM records
shm_writes            35192359       189.72 SHM writes
shm_flushes                  0         0.00 SHM flushes due to overflow
shm_cont                  6447         0.03 SHM MTX contention
shm_cycles                 208         0.00 SHM cycles through buffer
sms_nreq                     0         0.00 SMS allocator requests
sms_nobj                     0          .   SMS outstanding allocations
sms_nbytes                   0          .   SMS outstanding bytes
sms_balloc                   0          .   SMS bytes allocated
sms_bfree                    0          .   SMS bytes freed
backend_req             798844         4.31 Backend requests made
n_vcl                        1         0.00 N vcl total
n_vcl_avail                  1         0.00 N vcl available
n_vcl_discard                0         0.00 N vcl discarded
n_ban                        1          .   N total active bans
n_ban_add                    1         0.00 N new bans added
n_ban_retire                 0         0.00 N old bans deleted
n_ban_obj_test               0         0.00 N objects tested
n_ban_re_test                0         0.00 N regexps tested against
n_ban_dups                   0         0.00 N duplicate bans removed
hcb_nolock                   0         0.00 HCB Lookups without lock
hcb_lock                     0         0.00 HCB Lookups with lock
hcb_insert                   0         0.00 HCB Inserts
esi_errors                   0         0.00 ESI parse errors (unlock)
esi_warnings                 0         0.00 ESI parse warnings (unlock)
accept_fail                  0         0.00 Accept failures
client_drop_late             0         0.00 Connection dropped late
uptime                  185500         1.00 Client uptime
dir_dns_lookups              0         0.00 DNS director lookups
dir_dns_failed               0         0.00 DNS director failed lookups
dir_dns_hit                  0         0.00 DNS director cached lookups hit
dir_dns_cache_full           0         0.00 DNS director full dnscache
vmods                        0          .   Loaded VMODs
n_gzip                       0         0.00 Gzip operations
n_gunzip                     0         0.00 Gunzip operations
LCK.sms.creat                1         0.00 Created locks
LCK.sms.destroy              0         0.00 Destroyed locks
LCK.sms.locks                0         0.00 Lock Operations
LCK.sms.colls                0         0.00 Collisions
LCK.smp.creat                0         0.00 Created locks
LCK.smp.destroy              0         0.00 Destroyed locks
LCK.smp.locks                0         0.00 Lock Operations
LCK.smp.colls                0         0.00 Collisions
LCK.sma.creat                2         0.00 Created locks
LCK.sma.destroy              0         0.00 Destroyed locks
LCK.sma.locks          1759151         9.48 Lock Operations
LCK.sma.colls                0         0.00 Collisions
LCK.smf.creat                0         0.00 Created locks
LCK.smf.destroy              0         0.00 Destroyed locks
LCK.smf.locks                0         0.00 Lock Operations
LCK.smf.colls                0         0.00 Collisions
LCK.hsl.creat                0         0.00 Created locks
LCK.hsl.destroy              0         0.00 Destroyed locks
LCK.hsl.locks                0         0.00 Lock Operations
LCK.hsl.colls                0         0.00 Collisions
LCK.hcb.creat                0         0.00 Created locks
LCK.hcb.destroy              0         0.00 Destroyed locks
LCK.hcb.locks                0         0.00 Lock Operations
LCK.hcb.colls                0         0.00 Collisions
LCK.hcl.creat            70001         0.38 Created locks
LCK.hcl.destroy              0         0.00 Destroyed locks
LCK.hcl.locks         18532340        99.90 Lock Operations
LCK.hcl.colls                0         0.00 Collisions
LCK.vcl.creat                1         0.00 Created locks
LCK.vcl.destroy              0         0.00 Destroyed locks
LCK.vcl.locks             3999         0.02 Lock Operations
LCK.vcl.colls                0         0.00 Collisions
LCK.stat.creat               1         0.00 Created locks
LCK.stat.destroy             0         0.00 Destroyed locks
LCK.stat.locks             512         0.00 Lock Operations
LCK.stat.colls               0         0.00 Collisions
LCK.sessmem.creat            1         0.00 Created locks
LCK.sessmem.destroy            0         0.00 Destroyed locks
LCK.sessmem.locks        4533824        24.44 Lock Operations
LCK.sessmem.colls              0         0.00 Collisions
LCK.wstat.creat                1         0.00 Created locks
LCK.wstat.destroy              0         0.00 Destroyed locks
LCK.wstat.locks           575635         3.10 Lock Operations
LCK.wstat.colls                0         0.00 Collisions
LCK.herder.creat               1         0.00 Created locks
LCK.herder.destroy             0         0.00 Destroyed locks
LCK.herder.locks           17392         0.09 Lock Operations
LCK.herder.colls               0         0.00 Collisions
LCK.wq.creat                   4         0.00 Created locks
LCK.wq.destroy                 0         0.00 Destroyed locks
LCK.wq.locks            20053031       108.10 Lock Operations
LCK.wq.colls                   0         0.00 Collisions
LCK.objhdr.creat          799708         4.31 Created locks
LCK.objhdr.destroy          1454         0.01 Destroyed locks
LCK.objhdr.locks        20929870       112.83 Lock Operations
LCK.objhdr.colls               0         0.00 Collisions
LCK.exp.creat                  1         0.00 Created locks
LCK.exp.destroy                0         0.00 Destroyed locks
LCK.exp.locks             984222         5.31 Lock Operations
LCK.exp.colls                  0         0.00 Collisions
LCK.lru.creat                  2         0.00 Created locks
LCK.lru.destroy                0         0.00 Destroyed locks
LCK.lru.locks             798835         4.31 Lock Operations
LCK.lru.colls                  0         0.00 Collisions
LCK.cli.creat                  1         0.00 Created locks
LCK.cli.destroy                0         0.00 Destroyed locks
LCK.cli.locks              61755         0.33 Lock Operations
LCK.cli.colls                  0         0.00 Collisions
LCK.ban.creat                  1         0.00 Created locks
LCK.ban.destroy                0         0.00 Destroyed locks
LCK.ban.locks             984223         5.31 Lock Operations
LCK.ban.colls                  0         0.00 Collisions
LCK.vbp.creat                  1         0.00 Created locks
LCK.vbp.destroy                0         0.00 Destroyed locks
LCK.vbp.locks             623084         3.36 Lock Operations
LCK.vbp.colls                  0         0.00 Collisions
LCK.vbe.creat                  1         0.00 Created locks
LCK.vbe.destroy                0         0.00 Destroyed locks
LCK.vbe.locks             191999         1.04 Lock Operations
LCK.vbe.colls                  0         0.00 Collisions
LCK.backend.creat              8         0.00 Created locks
LCK.backend.destroy            0         0.00 Destroyed locks
LCK.backend.locks        2779529        14.98 Lock Operations
LCK.backend.colls              0         0.00 Collisions
SMA.s0.c_req             1596704         8.61 Allocator requests
SMA.s0.c_fail                  0         0.00 Allocator failures
SMA.s0.c_bytes       23077754159    124408.38 Bytes allocated
SMA.s0.c_freed       17482598971     94245.82 Bytes freed
SMA.s0.g_alloc           1596704          .   Allocations outstanding
SMA.s0.g_bytes        5595155188          .   Bytes outstanding
SMA.s0.g_space         172012812          .   Bytes available
SMA.Transient.c_req         1252         0.01 Allocator requests
SMA.Transient.c_fail           0         0.00 Allocator failures
SMA.Transient.c_bytes       556514         3.00 Bytes allocated
SMA.Transient.c_freed       556514         3.00 Bytes freed
SMA.Transient.g_alloc            0          .   Allocations outstanding
SMA.Transient.g_bytes            0          .   Bytes outstanding
SMA.Transient.g_space            0          .   Bytes available
VBE.mapweb11(,,80).vcls            1          .   VCL references
VBE.mapweb11(,,80).happy           0          .   Happy health probes
VBE.mapweb1(,,80).vcls             1          .   VCL references
VBE.mapweb1(,,80).happy 18446744073709551615          .   Happy health
probes
VBE.mapweb2(,,80).vcls             1          .   VCL references
VBE.mapweb2(,80).happy 18446744073709551615          .   Happy health probes
VBE.mapweb3(,,80).vcls              1          .   VCL references
VBE.mapweb3(,,80).happy  18446744073709551615          .   Happy health
probes
VBE.mapweb7(,,80).vcls             1          .   VCL references
VBE.mapweb7(,80).happy 18446744073709551615          .   Happy health probes
VBE.mapweb8(,80).vcls             1          .   VCL references
VBE.mapweb8(80).happy 18446744073709551615          .   Happy health probes
VBE.mapweb9(,80).vcls               1          .   VCL references
VBE.mapweb9(80).happy   18446744073709551615          .   Happy health
probes
VBE.mapweb10(,80).vcls             1          .   VCL references
VBE.mapweb10(,80).happy 18446744073709551615          .   Happy health
probes
---------------------------------------------------------------------------------------------------------------------------------------------------


mapping system VCL config.  I've snipped the unimportant stuff, and changed
my names around a bit
---------------------------------------------------------------------------------------------------------------------------------------------------
backend mapweb11 {
.host = "...";
.port = "80";
.probe = {
                .url = "/ka-map/images/a_pixel.gif";
                .interval = 5s;
                .timeout = 500 ms;
                .window = 5;
                .threshold = 3;
  }
}

# ... More backends defined here ...

director maps round-robin
{
  {  .backend = mapweb1; }
  {  .backend = mapweb2; }
  {  .backend = mapweb3; }
  {  .backend = mapweb7; }
  {  .backend = mapweb8; }
  {  .backend = mapweb9; }
  {  .backend = mapweb10; }
}
sub vcl_recv {
  set req.backend = maps;
    if (req.request != "GET" &&
      req.request != "HEAD" &&
      req.request != "PUT" &&
      req.request != "POST" &&
      req.request != "TRACE" &&
      req.request != "OPTIONS" &&
      req.request != "DELETE") {
        /* Non-RFC2616 or CONNECT which is weird. */
        return (pipe);
    }

    if (req.request != "GET" && req.request != "HEAD") {
        /* We only deal with GET and HEAD by default */
        return (pass);
    }
  # Don't cache any shapegen calls, they're dynamic
    if ( req.url ~ "^/cgi-bin/shapegen" )
    {
  return(pass);
    }
    # Change anything *.mydomain.com to just mydomain.com
    # to avoid duplications in the cache
    if ( req.http.host ~ "mydomain.com" )
    {
        set req.http.host = "mydomain.com";
    }

  # for mapping grace period
  set req.grace = 30s;
    return (lookup);
}
sub vcl_fetch {
     if (beresp.ttl <= 0s ||
         beresp.http.Set-Cookie ||
         beresp.http.Vary == "*")
     {
  return(hit_for_pass);
     }
  /* Remove Expires from backend, it's not long enough */
        unset beresp.http.expires;

        /* Set the clients TTL on this object */
        set beresp.http.Cache-Control = "max-age=604800";

        /* Set how long Varnish will keep it */
        set beresp.ttl = 1w;

        /* marker for vcl_deliver to reset Age: */
        set beresp.http.magicmarker = "1";
    set beresp.grace = 30s;
    return (deliver);
}
sub vcl_deliver {
    # Added by Cal to easily see a HIT / MISS in the headers
    if (obj.hits > 0) {
                set resp.http.X-Cache = "HIT";
    } else {
                set resp.http.X-Cache = "MISS";
    }

    if (resp.http.magicmarker) {
       /* Remove the magic marker */
       unset resp.http.magicmarker;

       /* By definition we have a fresh object */
       set resp.http.age = "0";
    }

    # Set a nice header to show which varnish server this comes from
    set resp.http.X-Hostname = regsub(server.identity, ".mydomain.com", "");

    return (deliver);
}
---------------------------------------------------------------------------------------------------------------------------------------------------

Thanks for any help!

--Cal



On Thu, Jul 19, 2012 at 2:20 PM, Andreas Plesner Jacobsen <apj at mutt.dk>wrote:

> On Thu, Jul 19, 2012 at 02:08:20PM -0500, Cal Heldenbrand wrote:
> >
> > I just upgraded to Varnish 3.0.2, and changed the storage method to
> malloc,
> > with a size limitation of 5GB on a machine with 6GB of physical memory.
> > Varnish doesn't appear to be using the size limitation, and is consuming
> > memory until the machine dips into swap and becomes unresponsive.
>
> Please attach a varnishstat. A copy of your vcl will probably be helpful
> too.
>
> --
> Andreas
>
> _______________________________________________
> varnish-dev mailing list
> varnish-dev at varnish-cache.org
> https://www.varnish-cache.org/lists/mailman/listinfo/varnish-dev
>
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