Re: [squid-users] High CPU usage problem on Squid 2.6 STABLE9

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@wp.pl> 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
>
Received on Sun Jan 28 2007 - 10:47:00 MST