High load within apache reload
8th February, 2010 - Posted by admin -
but apache restart/graceful causes high load.
Maybe it’s HW RAID issue(?), commit to RAID, flush memory (see memory before and after) …
Apache 2.2 + mod_php 5.2 + xcache (problem exists with or without xcache)
Storage HP SmartArray P400 512M, RAID 5, SAS 15.000 rpm
Accelerator Ratio: 25% Read / 75% Write
Drive Write Cache: Disabled
CPU 2x Xeon 3G FSB 800, RAM 12G @400 DDR2
systat - graceful at 1:38
12:00:01 PM CPU %user %nice %system %iowait %steal %idle
01:00:01 PM all 14.55 0.00 5.11 1.66 0.00 78.68
01:00:01 PM 0 5.77 0.00 1.73 0.42 0.00 92.09
01:00:01 PM 1 7.97 0.00 2.66 3.09 0.00 86.27
01:00:01 PM 2 21.92 0.00 7.60 1.09 0.00 69.40
01:00:01 PM 3 22.53 0.00 8.46 2.04 0.00 66.98
01:10:01 PM all 18.06 0.54 6.41 1.51 0.00 73.49
01:10:01 PM 0 7.81 0.73 2.44 0.39 0.00 88.63
01:10:01 PM 1 11.64 0.73 3.66 2.78 0.00 81.19
01:10:01 PM 2 27.04 0.50 9.66 0.70 0.00 62.09
01:10:01 PM 3 25.74 0.17 9.88 2.17 0.00 62.03
01:30:01 PM all 18.93 0.00 5.95 1.53 0.00 73.59
01:30:01 PM 0 8.65 0.00 2.60 0.50 0.00 88.25
01:30:01 PM 1 12.74 0.00 3.60 2.87 0.00 80.79
01:30:01 PM 2 27.33 0.00 8.39 0.90 0.00 63.38
01:30:01 PM 3 26.99 0.00 9.22 1.84 0.00 61.95
01:50:01 PM all 17.16 0.33 30.56 2.15 0.00 49.80
01:50:01 PM 0 9.45 0.23 28.65 0.92 0.00 60.75
01:50:01 PM 1 12.62 0.61 29.75 3.64 0.00 53.37
01:50:01 PM 2 24.18 0.33 31.26 1.35 0.00 42.87
01:50:01 PM 3 22.37 0.13 32.58 2.69 0.00 42.22load
time - 5min / 1min
13:00 - 0.85 /0.70
13:40 - 214.91 /368.09
13:45 - 131.11 /31.72
13:50 - 48.98 /1.60
14:10 - 8.61 /2.76
Apache status
32.2 requests/sec - 1.8 MB/second - 55.9 kB/request
meminfo - 13:50
MemTotal: 12299440 kB
MemFree: 5697636 kB
Buffers: 27780 kB
Cached: 1020168 kB
SwapCached: 16804 kB
Active: 4945368 kB
Inactive: 448168 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 12299440 kB
LowFree: 5697636 kB
SwapTotal: 3911788 kB
SwapFree: 3695788 kB
Dirty: 5864 kB
Writeback: 0 kB
AnonPages: 4331532 kB
Mapped: 165736 kB
Slab: 821012 kB
PageTables: 338480 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 10061508 kB
Committed_AS: 25428832 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 269404 kB
VmallocChunk: 34359468955 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
meminfo - 13:30
MemTotal: 12299440 kB
MemFree: 66364 kB
Buffers: 40204 kB
Cached: 1161748 kB
SwapCached: 6604 kB
Active: 10365272 kB
Inactive: 485796 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 12299440 kB
LowFree: 66364 kB
SwapTotal: 3911788 kB
SwapFree: 3760076 kB
Dirty: 3344 kB
Writeback: 0 kB
AnonPages: 9645832 kB
Mapped: 133832 kB
Slab: 978832 kB
PageTables: 356880 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
CommitLimit: 10061508 kB
Committed_AS: 30209056 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 269440 kB
VmallocChunk: 34359468907 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
Hugepagesize: 2048 kB
Apache conf
StartServers 250
MinSpareServers 250
MaxSpareServers 360
MaxClients 400
Filesystem, ext3, noatime, nodiratime
Anyone expirienced with this problem?
Posted on: February 8, 2010
Filed under: News
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