Sizing Varnish RAM after over allocation
Crowder, Travis
Travis.Crowder at penton.com
Tue Oct 1 19:29:19 CEST 2013
I am trying to properly size our Varnish cache size after it's been allocated way too much memory. The system is using about 10GB of RAM for Varnish.
Here is what I am using to calculate the total needed:
~ 100MB = Varnish Master Process
~ 80MB = Varnish Shared Memory Log
~ 2KB * n objects = Object storage overhead
~ yKB * n objects = Object storage
With this, I am estimating about 4.2GB for Varnish using a 32KB average object size. What I am having trouble with is the grace (set for 1 hour) and how that comes into play with storing objects. Are they stored for 1 hour after expiry in case a backend goes down and after the 1 hour available to be evicted? When exactly do objects free memory? I've found different information, but it seems the prevailing thought is only when a purge command occurs.
I am under the impression the expired objects just sit in memory until the cache is full (just before nuking objects) and then LRU eviction occurs. Is this accurate? I mean, even though I need about 5GB for Varnish, since I allocate 16GB, will the entire 16GB be used by expired objects?
Is there a way to tell exactly how much RAM is being used for VALID objects?
TIA,
Travis
client_conn 7668521 58.59 Client connections accepted
client_drop 0 0.00 Connection dropped, no sess/wrk
client_req 15846658 121.06 Client requests received
cache_hit 10757881 82.19 Cache hits
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backend_conn 4465314 34.11 Backend conn. success
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fetch_304 22537 0.17 Fetch no body (304)
n_sess_mem 682 . N struct sess_mem
n_sess 369 . N struct sess
n_object 119236 . N struct object
n_vampireobject 0 . N unresurrected objects
n_objectcore 119437 . N struct objectcore
n_objecthead 127556 . N struct objecthead
n_waitinglist 6994 . N struct waitinglist
n_vbc 10 . N struct vbc
n_wrk 400 . N worker threads
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n_wrk_failed 0 0.00 N worker threads not created
n_wrk_max 0 0.00 N worker threads limited
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n_wrk_queued 0 0.00 N queued work requests
n_wrk_drop 0 0.00 N dropped work requests
n_backend 11 . N backends
n_expired 3890039 . N expired objects
n_lru_nuked 0 . N LRU nuked objects
n_lru_moved 8128646 . N LRU moved objects
losthdr 91 0.00 HTTP header overflows
n_objsendfile 0 0.00 Objects sent with sendfile
n_objwrite 13494880 103.10 Objects sent with write
n_objoverflow 0 0.00 Objects overflowing workspace
s_sess 7668501 58.59 Total Sessions
s_req 15846658 121.06 Total Requests
s_pipe 1251 0.01 Total pipe
s_pass 453681 3.47 Total pass
s_fetch 4462324 34.09 Total fetch
s_hdrbytes 7307416930 55826.98 Total header bytes
s_bodybytes 435088023618 3323972.25 Total body bytes
sess_closed 2239685 17.11 Session Closed
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sess_readahead 0 0.00 Session Read Ahead
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sess_herd 12875482 98.37 Session herd
shm_records 916560440 7002.31 SHM records
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shm_flushes 14 0.00 SHM flushes due to overflow
shm_cont 10334 0.08 SHM MTX contention
shm_cycles 405 0.00 SHM cycles through buffer
sms_nreq 313389 2.39 SMS allocator requests
sms_nobj 0 . SMS outstanding allocations
sms_nbytes 0 . SMS outstanding bytes
sms_balloc 544043304 . SMS bytes allocated
sms_bfree 544043304 . SMS bytes freed
backend_req 4463489 34.10 Backend requests made
n_vcl 3 0.00 N vcl total
n_vcl_avail 3 0.00 N vcl available
n_vcl_discard 0 0.00 N vcl discarded
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n_ban_retire 31391 0.24 N old bans deleted
n_ban_obj_test 16197865 123.75 N objects tested
n_ban_re_test 3174198250 24250.14 N regexps tested against
n_ban_dups 33565 0.26 N duplicate bans removed
hcb_nolock 14802058 113.08 HCB Lookups without lock
hcb_lock 3831356 29.27 HCB Lookups with lock
hcb_insert 3831344 29.27 HCB Inserts
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esi_warnings 0 0.00 ESI parse warnings (unlock)
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vmods 0 . Loaded VMODs
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LCK.sms.creat 1 0.00 Created locks
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LCK.sessmem.locks 7703601 58.85 Lock Operations
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LCK.objhdr.locks 79026186 603.74 Lock Operations
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LCK.cli.creat 1 0.00 Created locks
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LCK.backend.creat 11 0.00 Created locks
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LCK.backend.locks 13425358 102.57 Lock Operations
LCK.backend.colls 0 0.00 Collisions
SMA.s0.c_req 8642204 66.02 Allocator requests
SMA.s0.c_fail 0 0.00 Allocator failures
SMA.s0.c_bytes 413441801561 3158600.10 Bytes allocated
SMA.s0.c_freed 405211048073 3095719.04 Bytes freed
SMA.s0.g_alloc 238498 . Allocations outstanding
SMA.s0.g_bytes 8230753488 . Bytes outstanding
SMA.s0.g_space 8949115696 . Bytes available
SMA.Transient.c_req 884306 6.76 Allocator requests
SMA.Transient.c_fail 0 0.00 Allocator failures
SMA.Transient.c_bytes 31276155463 238942.62 Bytes allocated
SMA.Transient.c_freed 31276023159 238941.61 Bytes freed
SMA.Transient.g_alloc 2 . Allocations outstanding
SMA.Transient.g_bytes 132304 . Bytes outstanding
SMA.Transient.g_space 0 . Bytes available
VBE.web10(10.2.180.74,,80).vcls 2 . VCL references
VBE.web10(10.2.180.74,,80).happy18446744073709551615 . Happy health probes
VBE.web11(10.2.180.75,,80).vcls 3 . VCL references
VBE.web11(10.2.180.75,,80).happy18446744073709551615 . Happy health probes
VBE.web12(10.2.180.185,,80).vcls 3 . VCL references
VBE.web12(10.2.180.185,,80).happy 18446744073709551615 . Happy health probes
VBE.web13(10.2.180.186,,80).vcls 3 . VCL references
VBE.web13(10.2.180.186,,80).happy 18446744073709551615 . Happy health probes
VBE.web14(10.2.180.198,,80).vcls 3 . VCL references
VBE.web14(10.2.180.198,,80).happy 18446744073709551615 . Happy health probes
VBE.web15(10.2.180.199,,80).vcls 3 . VCL references
VBE.web15(10.2.180.199,,80).happy 18446744073709551615 . Happy health probes
VBE.web16(10.2.180.47,,80).vcls 3 . VCL references
VBE.web16(10.2.180.47,,80).happy 18446744073709551615 . Happy health probes
VBE.web17(10.2.180.48,,80).vcls 3 . VCL references
VBE.web17(10.2.180.48,,80).happy 18446744073709551615 . Happy health probes
VBE.web18(10.2.180.49,,80).vcls 3 . VCL references
VBE.web18(10.2.180.49,,80).happy 18446744073709551615 . Happy health probes
VBE.web19(10.2.180.50,,80).vcls 3 . VCL references
VBE.web19(10.2.180.50,,80).happy 18446744073709551615 . Happy health probes
VBE.web20(10.2.180.44,,80).vcls 2 . VCL references
VBE.web20(10.2.180.44,,80).happy 18446744073709551615 . Happy health probes
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