varnish *slowing* down site, any ideas?
Zachary Alex Stern
zacharyalexstern at gmail.com
Wed Mar 28 21:57:52 CEST 2012
*Output of varnishadm param.show:*
acceptor_sleep_decay 0.900000 []
acceptor_sleep_incr 0.001000 [s]
acceptor_sleep_max 0.050000 [s]
auto_restart on [bool]
ban_dups on [bool]
ban_lurker_sleep 0.010000 [s]
between_bytes_timeout 60.000000 [s]
cc_command "exec gcc -std=gnu99 -g -O2 -pthread -fpic
-shared -Wl,-x -o %o %s"
cli_buffer 8192 [bytes]
cli_timeout 10 [seconds]
clock_skew 10 [s]
connect_timeout 0.700000 [s]
critbit_cooloff 180.000000 [s]
default_grace 10.000000 [seconds]
default_keep 0.000000 [seconds]
default_ttl 120.000000 [seconds]
diag_bitmap 0x0 [bitmap]
esi_syntax 0 [bitmap]
expiry_sleep 1.000000 [seconds]
fetch_chunksize 128 [kilobytes]
fetch_maxchunksize 262144 [kilobytes]
first_byte_timeout 60.000000 [s]
group nogroup (65534)
gzip_level 6 []
gzip_memlevel 8 []
gzip_stack_buffer 32768 [Bytes]
gzip_tmp_space 0 []
gzip_window 15 []
http_gzip_support on [bool]
http_max_hdr 64 [header lines]
http_range_support on [bool]
http_req_hdr_len 8192 [bytes]
http_req_size 32768 [bytes]
http_resp_hdr_len 8192 [bytes]
http_resp_size 32768 [bytes]
listen_address 0.0.0.0:80
listen_depth 1024 [connections]
log_hashstring on [bool]
log_local_address off [bool]
lru_interval 2 [seconds]
max_esi_depth 5 [levels]
max_restarts 4 [restarts]
nuke_limit 50 [allocations]
ping_interval 3 [seconds]
pipe_timeout 60 [seconds]
prefer_ipv6 off [bool]
queue_max 100 [%]
rush_exponent 3 [requests per request]
saintmode_threshold 10 [objects]
send_timeout 60 [seconds]
sess_timeout 5 [seconds]
sess_workspace 65536 [bytes]
session_linger 50 [ms]
session_max 100000 [sessions]
shm_reclen 255 [bytes]
shm_workspace 8192 [bytes]
shortlived 10.000000 [s]
syslog_cli_traffic on [bool]
thread_pool_add_delay 2 [milliseconds]
thread_pool_add_threshold 2 [requests]
thread_pool_fail_delay 200 [milliseconds]
thread_pool_max 2048 [threads]
thread_pool_min 1 [threads]
thread_pool_purge_delay 1000 [milliseconds]
thread_pool_stack unlimited [bytes]
thread_pool_timeout 10 [seconds]
thread_pool_workspace 65536 [bytes]
thread_pools 2 [pools]
thread_stats_rate 10 [requests]
user nobody (65534)
vcc_err_unref on [bool]
vcl_dir /etc/varnish
vcl_trace off [bool]
vmod_dir /usr/lib/varnish/vmods
waiter default (epoll, poll)
*
*
*Output of varnishstat -1:*
client_conn 1164 1.23 Client connections accepted
client_drop 0 0.00 Connection dropped, no sess/wrk
client_req 1164 1.23 Client requests received
cache_hit 524 0.56 Cache hits
cache_hitpass 0 0.00 Cache hits for pass
cache_miss 98 0.10 Cache misses
backend_conn 546 0.58 Backend conn. success
backend_unhealthy 0 0.00 Backend conn. not attempted
backend_busy 0 0.00 Backend conn. too many
backend_fail 0 0.00 Backend conn. failures
backend_reuse 94 0.10 Backend conn. reuses
backend_toolate 3 0.00 Backend conn. was closed
backend_recycle 97 0.10 Backend conn. recycles
backend_retry 0 0.00 Backend conn. retry
fetch_head 0 0.00 Fetch head
fetch_length 563 0.60 Fetch with Length
fetch_chunked 14 0.01 Fetch chunked
fetch_eof 0 0.00 Fetch EOF
fetch_bad 0 0.00 Fetch had bad headers
fetch_close 43 0.05 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 19 0.02 Fetch no body (304)
n_sess_mem 17 . N struct sess_mem
n_sess 0 . N struct sess
n_object 69 . N struct object
n_vampireobject 0 . N unresurrected objects
n_objectcore 71 . N struct objectcore
n_objecthead 71 . N struct objecthead
n_waitinglist 24 . N struct waitinglist
n_vbc 0 . N struct vbc
n_wrk 2 . N worker threads
n_wrk_create 24 0.03 N worker threads created
n_wrk_failed 0 0.00 N worker threads not created
n_wrk_max 33 0.03 N worker threads limited
n_wrk_lqueue 0 0.00 work request queue length
n_wrk_queued 152 0.16 N queued work requests
n_wrk_drop 0 0.00 N dropped work requests
n_backend 1 . N backends
n_expired 29 . N expired objects
n_lru_nuked 0 . N LRU nuked objects
n_lru_moved 458 . N LRU moved objects
losthdr 0 0.00 HTTP header overflows
n_objsendfile 0 0.00 Objects sent with sendfile
n_objwrite 1135 1.20 Objects sent with write
n_objoverflow 0 0.00 Objects overflowing workspace
s_sess 1164 1.23 Total Sessions
s_req 1164 1.23 Total Requests
s_pipe 0 0.00 Total pipe
s_pass 542 0.57 Total pass
s_fetch 639 0.68 Total fetch
s_hdrbytes 437246 463.18 Total header bytes
s_bodybytes 14474608 15333.27 Total body bytes
sess_closed 1164 1.23 Session Closed
sess_pipeline 0 0.00 Session Pipeline
sess_readahead 0 0.00 Session Read Ahead
sess_linger 0 0.00 Session Linger
sess_herd 0 0.00 Session herd
shm_records 85020 90.06 SHM records
shm_writes 6648 7.04 SHM writes
shm_flushes 0 0.00 SHM flushes due to overflow
shm_cont 8 0.01 SHM MTX contention
shm_cycles 0 0.00 SHM cycles through buffer
sms_nreq 1 0.00 SMS allocator requests
sms_nobj 0 . SMS outstanding allocations
sms_nbytes 0 . SMS outstanding bytes
sms_balloc 419 . SMS bytes allocated
sms_bfree 419 . SMS bytes freed
backend_req 640 0.68 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 944 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 521 0.55 Gunzip operations
LCK.sms.creat 1 0.00 Created locks
LCK.sms.destroy 0 0.00 Destroyed locks
LCK.sms.locks 3 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 2922 3.10 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 16383 17.35 Created locks
LCK.hcl.destroy 0 0.00 Destroyed locks
LCK.hcl.locks 1175 1.24 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 48 0.05 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 17 0.02 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 1270 1.35 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 2858 3.03 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 148 0.16 Lock Operations
LCK.herder.colls 0 0.00 Collisions
LCK.wq.creat 2 0.00 Created locks
LCK.wq.destroy 0 0.00 Destroyed locks
LCK.wq.locks 4200 4.45 Lock Operations
LCK.wq.colls 0 0.00 Collisions
LCK.objhdr.creat 119 0.13 Created locks
LCK.objhdr.destroy 48 0.05 Destroyed locks
LCK.objhdr.locks 1469 1.56 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 1072 1.14 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 98 0.10 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 327 0.35 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 1073 1.14 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 0 0.00 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 1092 1.16 Lock Operations
LCK.vbe.colls 0 0.00 Collisions
LCK.backend.creat 1 0.00 Created locks
LCK.backend.destroy 0 0.00 Destroyed locks
LCK.backend.locks 1895 2.01 Lock Operations
LCK.backend.colls 0 0.00 Collisions
SMA.s0.c_req 172 0.18 Allocator requests
SMA.s0.c_fail 0 0.00 Allocator failures
SMA.s0.c_bytes 8694705 9210.49 Bytes allocated
SMA.s0.c_freed 6874254 7282.05 Bytes freed
SMA.s0.g_alloc 137 . Allocations outstanding
SMA.s0.g_bytes 1820451 . Bytes outstanding
SMA.s0.g_space 1071921373 . Bytes available
SMA.Transient.c_req 1089 1.15 Allocator requests
SMA.Transient.c_fail 0 0.00 Allocator failures
SMA.Transient.c_bytes 64465868 68290.11 Bytes allocated
SMA.Transient.c_freed 64465868 68290.11 Bytes freed
SMA.Transient.g_alloc 0 . Allocations outstanding
SMA.Transient.g_bytes 0 . Bytes outstanding
SMA.Transient.g_space 0 . Bytes available
VBE.default(127.0.0.1,,8081).vcls 1 . VCL references
VBE.default(127.0.0.1,,8081).happy 0 . Happy health
probes
*
*
Thanks in advance.
On Wed, Mar 28, 2012 at 3:45 AM, Stig Bakken <stig at zedge.net> wrote:
> On Wed, Mar 28, 2012 at 1:31 AM, Zachary Alex Stern <
> zacharyalexstern at gmail.com> wrote:
>
>> Hey there,
>>
>> We have a lot of websites (perhaps 15-20) running on apache, behind a
>> varnish cache.
>>
>> One of our sites seems to experience random slowdowns when varnish is
>> enabled. It will take between 5-20 seconds to load, fairly frequently. Our
>> other sites all seem unaffected.
>>
>> When I disable varnish and have apache listen on port 80, the problem
>> disappears entirely.
>>
>> Any thoughts?
>>
>> Here's our vcl.conf if it helps: http://pastebin.com/XPUvSPeu
>>
>
> For this kind of problem, it is very useful if you post the output of
> "varnishadm param.show" and "varnishstat -1" as well.
>
> - Stig
>
>
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