<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Go look in /var/log/daemon.log, and find out why the children are dying. If you're getting SEGVs, that's going to be listed in your syslog.<div><br></div><div>A big reason for crashing is running out of session workspace (sess_workspace). Find out if that's happening, and if it is, increase it. (say, to 512k)</div><div><br></div><div><br></div><div>-j</div><div><br><div><div>On May 13, 2009, at 5:17 PM, Cloude Porteus wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">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.<br><br>I don't currently have any logging turned on. If I did, would it have any useful information for me? <br> <br>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.<br><br>Our config:<br><br>NFILES=131072<br>MEMLOCK=90000<br>DAEMON_COREFILE_LIMIT="unlimited"<br> VARNISH_VCL_CONF=/etc/varnish/instructables.vcl<br>VARNISH_LISTEN_ADDRESS=<br>VARNISH_LISTEN_PORT=80<br>VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1<br>VARNISH_ADMIN_LISTEN_PORT=82<br>VARNISH_MIN_THREADS=400<br>VARNISH_MAX_THREADS=4000<br> VARNISH_THREAD_TIMEOUT=60<br>VARNISH_STORAGE_FILE=/var/lib/varnish/mmap<br>VARNISH_STORAGE_SIZE=50G<br>VARNISH_STORAGE="file,${VARNISH_STORAGE_FILE},${VARNISH_STORAGE_SIZE}"<br>VARNISH_TTL=1800<br><br>DAEMON_OPTS="-a ${VARNISH_LISTEN_ADDRESS}:${VARNISH_LISTEN_PORT} \<br> -f ${VARNISH_VCL_CONF} \<br> -T ${VARNISH_ADMIN_LISTEN_ADDRESS}:${VARNISH_ADMIN_LISTEN_PORT} \<br> -t ${VARNISH_TTL} \<br> -w ${VARNISH_MIN_THREADS},${VARNISH_MAX_THREADS},${VARNISH_THREAD_TIMEOUT} \<br> -u varnish -g varnish \<br> -s ${VARNISH_STORAGE} \<br> -p obj_workspace=4096 \<br> -p sess_workspace=262144 \<br> -p lru_interval=3600 \<br> -p listen_depth=8192 \<br> -p log_hashstring=off \<br> -p sess_timeout=10 \<br> -p shm_workspace=32768 \<br> -p ping_interval=1 \<br> -p thread_pools=4 \<br> -p thread_pool_min=100 \<br> -p thread_pool_max=4000 \<br> -p srcaddr_ttl=0 \<br> -p esi_syntax=1 "<br><br>I don't think out load is all that heavy and we have a high hitrate ratio. Our varnishstat output.<br> <br>0+11:02:14 <br>Hitrate ratio: 10 100 133<br>Hitrate avg: 0.9875 0.9833 0.9832<br><br> 15370527 325.94 386.84 Client connections accepted<br> 15370517 325.94 386.84 Client requests received<br> 14604988 320.94 367.57 Cache hits<br> 182795 4.00 4.60 Cache hits for pass<br> 581426 1.00 14.63 Cache misses<br> 765513 5.00 19.27 Backend connections success<br> 1 0.00 0.00 Backend connections failures<br> 119 . . N struct sess_mem<br> 10 . . N struct sess<br> 447866 . . N struct object<br> 440545 . . N struct objecthead<br> 913238 . . N struct smf<br> 4490 . . N small free smf<br> 2 . . N large free smf<br> 0 . . N struct vbe_conn<br> 112 . . N struct bereq<br> 400 . . N worker threads<br> 400 0.00 0.01 N worker threads created<br> 313048 0.00 7.88 N worker threads limited<br> 1 . . N backends<br> 126326 . . N expired objects<br> 1250255 . . N LRU moved objects<br> 18 0.00 0.00 HTTP header overflows<br> 13645614 292.95 343.42 Objects sent with write<br> 15370518 327.94 386.84 Total Sessions<br> 15370510 327.94 386.84 Total Requests<br> 7 0.00 0.00 Total pipe<br> 191394 5.00 4.82 Total pass<br> 765481 9.00 19.27 Total fetch<br> 7252376430 156332.93 182523.19 Total header bytes<br> 74103505138 772233.39 1864989.81 Total body bytes<br> 15370160 327.94 386.83 Session Closed<br> 365 0.00 0.01 Session herd<br> 758091326 15625.09 19079.16 SHM records<br> 62365137 1317.75 1569.57 SHM writes<br> 468 0.00 0.01 SHM flushes due to overflow<br> 589 0.00 0.01 SHM MTX contention<br> 307 0.00 0.01 SHM cycles through buffer<br> 1573886 15.00 39.61 allocator requests<br> 908746 . . outstanding allocations<br> 7766196224 . . bytes allocated<br> 45920894976 . . bytes free<br> <br clear="all"><br>-- <br> VP of Product Development<br>Instructables.com<br><br><a href="http://www.instructables.com/member/lebowski" target="_blank">http://www.instructables.com/member/lebowski</a><br> _______________________________________________<br>varnish-dev mailing list<br><a href="mailto:varnish-dev@projects.linpro.no">varnish-dev@projects.linpro.no</a><br>http://projects.linpro.no/mailman/listinfo/varnish-dev<br></blockquote></div><br><div apple-content-edited="true"> <div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>---</div><div>John Adams</div><div>Twitter Operations</div><div><a href="mailto:jna@twitter.com">jna@twitter.com</a></div><div><a href="http://twitter.com/netik">http://twitter.com/netik</a></div><div><br></div></div></span><br class="Apple-interchange-newline"></div><br class="Apple-interchange-newline"> </div><br></div></body></html>