Memcached

Memcached configuration.

new allocations

New size 140 megabytes each. Something between 20 and 35 megabytes of swap each appears not to cause high page fault rates.

server	IP	copies	total	swp each
dalembert	207.142.131.194	1	140	8m
Bart	207.142.131.227	7	980	0
Bayle	207.142.131.228	7	980	4m
Isidore	207.142.131.231	2	280	0
Moreri	207.142.131.232	2	280	0
Yongle	207.142.131.237	13	1820	11m
Avicenna	207.142.131.249	1	140	14m
total		33	4620

swap analysis

Done just after peak time after 8 days running (for most systems). New size 140M

server	IP	copies	total	pg flt	CPU min	cached	MC swapped
dalembert	207.142.131.194	1	180	43000	12	214756	48m
Tingxi	207.142.131.195	1	180	143000	25	252928k	112m
Alrazi	207.142.131.196	1	180	192000	39	13232k	127m
Friedrich	207.142.131.197	1	180	170000	61	234780	147m
Harris	207.142.131.199	1	180	142000	31	304076	136m
Bart	207.142.131.227	6	1080	1820	516	441232	87m/15e
Bayle	207.142.131.228	6	1080	3734	425	420096	127m/21e
Isidore	207.142.131.231	2	360	2486	224	341100	44m/22e
Moreri	207.142.131.232	2	360	52000	693	352312	71m/35e
Yongle	207.142.131.237	12	2160	16574	208	13640k	476m/40e
Avicenna	207.142.131.249	1	180	101000	14	212892k	54m
total		34	6120

new

180MB each. 200MB looked too tight for two copies each on Isidore and Moreri. Vincent wasn't used because it showed cyclic high RAM use. Switched on 19 September 2004.

server	IP	copies	total	notes
dalembert	207.142.131.194	1	180
Tingxi	207.142.131.195	1	180
Alrazi	207.142.131.196	1	180
Friedrich	207.142.131.197	1	180
Harris	207.142.131.199	1	180
Bart	207.142.131.227	6	1080
Bayle	207.142.131.228	6	1080
Isidore	207.142.131.231	2	360
Moreri	207.142.131.232	2	360
Yongle	207.142.131.237	12	2160
Avicenna	207.142.131.249	1	180
total		34	6120

CommonSettings.php entry looks like this:

$wgMemCachedServers = array(
        "207.142.131.194:11000", # dalembert
        "207.142.131.195:11000", # tingxi
        "207.142.131.196:11000", # alrazi
        "207.142.131.197:11000", # friedrich
        "207.142.131.199:11000", # harris
        "207.142.131.227:11000", # bart
        "207.142.131.227:11001",
        "207.142.131.227:11002",
        "207.142.131.227:11003",
        "207.142.131.227:11004",
        "207.142.131.227:11005",
        "207.142.131.228:11000", # bayle
        "207.142.131.228:11001",
        "207.142.131.228:11002",
        "207.142.131.228:11003",
        "207.142.131.228:11004",
        "207.142.131.228:11005",
        "207.142.131.231:11000", # isidore
        "207.142.131.231:11001",
        "207.142.131.232:11000", # moreri
        "207.142.131.232:11001",
        "207.142.131.237:11000", # yongle
        "207.142.131.237:11001",
        "207.142.131.237:11002",
        "207.142.131.237:11003",
        "207.142.131.237:11004",
        "207.142.131.237:11005",
        "207.142.131.237:11006",
        "207.142.131.237:11007",
        "207.142.131.237:11008",
        "207.142.131.237:11009",
        "207.142.131.237:11010",
        "207.142.131.237:11011",
        "207.142.131.249:11000", # avicenna
);

old

512MB each, used prior to 19 September 2004.

server	IP	copies	total	notes
Rabanus	207.142.131.239	4	2048	moving to squid
Yongle	207.142.131.237	4	2048	keeping - runs stats job
Bart	207.142.131.227	2	1024
Bayle	207.142.131.228	2	1024
total		12	6144

CommonSettings.php entry looked like this:

$wgMemCachedServers = array(
        "207.142.131.227:11000", # bart
        "207.142.131.227:11001",
        "207.142.131.228:11000", # bayle
        "207.142.131.228:11001",
        "207.142.131.237:11000", # yongle
        "207.142.131.237:11001",
        "207.142.131.237:11002",
        "207.142.131.237:11003",
        "207.142.131.239:11000", # rabanus
        "207.142.131.239:11001",
        "207.142.131.239:11002",
        "207.142.131.239:11003"
);