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Re: High CPU usage problem on Squid 2.6 STABLE9

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There is some problem,  Squid carries much more with low CPU.

What is your OS ? Maybe it doesn't support epoll ?

Itzcak

On 1/28/07, Robert <vipit@xxxxx> wrote:
Hello
i have problem with high cpu usage and browsing latency (now browsing
sites without squid if faster than with squid enabled),

i have 3 SCSI disk in configuration:
cache_dir diskd /cache/cache1 1000 2 256 Q1=64 Q2=72
cache_dir diskd /cache/cache2 1000 2 256 Q1=64 Q2=72
cache_dir diskd /cache/cache3 1000 2 256 Q1=64 Q2=72
and mounted:
/dev/sdd1 on /cache/cache1 type reiserfs
(rw,noexec,nosuid,noatime,nodiratime,notail,nolog,block-allocator=noborder)
/dev/sde1 on /cache/cache2 type reiserfs
(rw,noexec,nosuid,noatime,nodiratime,notail,nolog,block-allocator=noborder)
/dev/sdf1 on /cache/cache3 type reiserfs
(rw,noexec,nosuid,noatime,nodiratime,notail,nolog,block-allocator=noborder)

Server have 2 processors Intel(R) Xeon(TM) CPU 3.06GHz

squid compiled with epool options:
Squid Cache: Version 2.6.STABLE9
configure options: '--enable-storeio=diskd,aufs'
'--enable-removal-policies=heap' '--disable-wccp' '--enable-arp-acl'
'--enable-cache-digests' '--enable-default-err-language=Polish'
'--enable-linux-netfilter' '--disable-ident-lookups'
'--disable-hostname-checks' '--enable-underscores' '--enable-async-io'
'--enable-kill-parent-hack' '--enable-dlmalloc'
'--enable-xmalloc-statistics' '--enable-epoll' '--with-pthreads'
'--disable-poll' '--disable-select' '--disable-kqueue'
and top shows cpu usage between: 45-80%

General Runtime Information:
Squid Object Cache: Version 2.6.STABLE9
Start Time:    Sat, 27 Jan 2007 22:25:44 GMT
Current Time:    Sun, 28 Jan 2007 12:13:04 GMT

Connection information for squid:
   Number of clients accessing cache:    600
   Number of HTTP requests received:    1207836
   Number of ICP messages received:    0
   Number of ICP messages sent:    0
   Number of queued ICP replies:    0
   Request failure ratio:     0.00
   Average HTTP requests per minute since start:    1459.9
   Average ICP messages per minute since start:    0.0
   Select loop called: 13632428 times, 3.641 ms avg
Cache information for squid:
   Request Hit Ratios:    5min: 27.8%, 60min: 32.4%
   Byte Hit Ratios:    5min: 3.2%, 60min: 7.5%
   Request Memory Hit Ratios:    5min: 26.6%, 60min: 37.1%
   Request Disk Hit Ratios:    5min: 17.4%, 60min: 19.5%
   Storage Swap size:    2764200 KB
   Storage Mem size:    262140 KB
   Mean Object Size:    9.42 KB
   Requests given to unlinkd:    0
Median Service Times (seconds)  5 min    60 min:
   HTTP Requests (All):   0.09736  0.07825
   Cache Misses:          0.15888  0.15048
   Cache Hits:            0.01035  0.00767
   Near Hits:             0.20843  0.08265
   Not-Modified Replies:  0.00919  0.00562
   DNS Lookups:           0.00669  0.00464
   ICP Queries:           0.00000  0.00000
Resource usage for squid:
   UP Time:    49639.941 seconds
   CPU Time:    7749.424 seconds
   CPU Usage:    15.61%
   CPU Usage, 5 minute avg:    68.05%
   CPU Usage, 60 minute avg:    60.43%
   Process Data Segment Size via sbrk(): 380084 KB
   Maximum Resident Size: 0 KB
   Page faults with physical i/o: 0
Memory usage for squid via mallinfo():
   Total space in arena:  380084 KB
   Ordinary blocks:       372509 KB  30299 blks
   Small blocks:               0 KB      0 blks
   Holding blocks:          3744 KB      6 blks
   Free Small blocks:          0 KB
   Free Ordinary blocks:    7574 KB
   Total in use:          376253 KB 98%
   Total free:              7574 KB 2%
   Total size:            383828 KB
Memory accounted for:
   Total accounted:       335021 KB
   memPoolAlloc calls: 147275404
   memPoolFree calls: 145284658
File descriptor usage for squid:
   Maximum number of file descriptors:   8192
   Largest file desc currently in use:    255
   Number of file desc currently in use:  155
   Files queued for open:                   0
   Available number of file descriptors: 8037
   Reserved number of file descriptors:   100
   Store Disk files open:                   0
   IO loop method:                     epoll
Internal Data Structures:
   296720 StoreEntries
    62366 StoreEntries with MemObjects
    62303 Hot Object Cache Items
   293437 on-disk objects

This is normal that cpu usage is high or something is wrong ?

Thanks for help
Robert


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