Varnish seems to restart itself every so often, usually after a few days. We
finally installed some SSD's, which made all the difference and our system
load came down to the .02 - .2 range.
I don't currently have any logging turned on. If I did, would it have any
useful information for me?
We typically don't have more that 700k objects cached. I also never see the
worker threads go above 400. We are running on CentOS 5.
Our config:
NFILES=131072
MEMLOCK=90000
DAEMON_COREFILE_LIMIT="unlimited"
VARNISH_VCL_CONF=/etc/varnish/instructables.vcl
VARNISH_LISTEN_ADDRESS=
VARNISH_LISTEN_PORT=80
VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1
VARNISH_ADMIN_LISTEN_PORT=82
VARNISH_MIN_THREADS=400
VARNISH_MAX_THREADS=4000
VARNISH_THREAD_TIMEOUT=60
VARNISH_STORAGE_FILE=/var/lib/varnish/mmap
VARNISH_STORAGE_SIZE=50G
VARNISH_STORAGE="file,${VARNISH_STORAGE_FILE},${VARNISH_STORAGE_SIZE}"
VARNISH_TTL=1800
DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \
-f ${VARNISH_VCL_CONF} \
-T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT}
\
-t ${VARNISH_TTL} \
-w
${VARNISH_MIN_THREADS},${VARNISH_MAX_THREADS},${VARNISH_THREAD_TIMEOUT} \
-u varnish -g varnish \
-s ${VARNISH_STORAGE} \
-p obj_workspace=4096 \
-p sess_workspace=262144 \
-p lru_interval=3600 \
-p listen_depth=8192 \
-p log_hashstring=off \
-p sess_timeout=10 \
-p shm_workspace=32768 \
-p ping_interval=1 \
-p thread_pools=4 \
-p thread_pool_min=100 \
-p thread_pool_max=4000 \
-p srcaddr_ttl=0 \
-p esi_syntax=1 "
I don't think out load is all that heavy and we have a high hitrate ratio.
Our varnishstat output.
0+11:02:14
Hitrate ratio: 10 100 133
Hitrate avg: 0.9875 0.9833 0.9832
15370527 325.94 386.84 Client connections accepted
15370517 325.94 386.84 Client requests received
14604988 320.94 367.57 Cache hits
182795 4.00 4.60 Cache hits for pass
581426 1.00 14.63 Cache misses
765513 5.00 19.27 Backend connections success
1 0.00 0.00 Backend connections failures
119 . . N struct sess_mem
10 . . N struct sess
447866 . . N struct object
440545 . . N struct objecthead
913238 . . N struct smf
4490 . . N small free smf
2 . . N large free smf
0 . . N struct vbe_conn
112 . . N struct bereq
400 . . N worker threads
400 0.00 0.01 N worker threads created
313048 0.00 7.88 N worker threads limited
1 . . N backends
126326 . . N expired objects
1250255 . . N LRU moved objects
18 0.00 0.00 HTTP header overflows
13645614 292.95 343.42 Objects sent with write
15370518 327.94 386.84 Total Sessions
15370510 327.94 386.84 Total Requests
7 0.00 0.00 Total pipe
191394 5.00 4.82 Total pass
765481 9.00 19.27 Total fetch
7252376430 156332.93 182523.19 Total header bytes
74103505138 772233.39 1864989.81 Total body bytes
15370160 327.94 386.83 Session Closed
365 0.00 0.01 Session herd
758091326 15625.09 19079.16 SHM records
62365137 1317.75 1569.57 SHM writes
468 0.00 0.01 SHM flushes due to overflow
589 0.00 0.01 SHM MTX contention
307 0.00 0.01 SHM cycles through buffer
1573886 15.00 39.61 allocator requests
908746 . . outstanding allocations
7766196224 . . bytes allocated
45920894976 . . bytes free
--
VP of Product Development
Instructables.com
http://www.instructables.com/member/lebowski
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