[squid-users] Squid cpu usage 100% from few days ago !!

[Antony Stone]

On Saturday 13 August 2016 at 09:18:24, Omid Kosari wrote:

> Hello,
> 
> Recently 2 different squid boxes grows from ~40% cpu usage to 100% without
> any changes to config/banwidth/number of clients/etc

What are your bandwidth and number of clients?

> The problems forced me to bypass squid until the problem found .
> Right now even 10% of users can make squid 100% .

How many users is 10%, and how many accesses per second/minute are they making 
through Squid?

> Info
> 
> Squid is in tproxy mode with routing
> 
> Ubuntu Linux 16.04 , 4.4.0-34-generic on x86_64

How much RAM do you have, how many CPU cores, what speed CPU?

> Squid Cache: Version 3.5.19 from debian repository
> 
> 
> samples  %        image name               symbol name
> 1532894  42.8190  libc-2.23.so             _IO_strn_overflow
> 1028537  28.7306  libc-2.23.so             _IO_default_xsputn
> 662802   18.5143  libc-2.23.so             vfprintf
> 77019     2.1514  squid                    /usr/sbin/squid
> 28861     0.8062  libc-2.23.so             __memset_sse2
> 26948     0.7528  r8169                    /r8169
> 25320     0.7073  libc-2.23.so             __memcpy_sse2_unaligned
> 21712     0.6065  libc-2.23.so             __GI___mempcpy
> 14918     0.4167  libc-2.23.so             _int_malloc
> 8889      0.2483  nf_conntrack             /nf_conntrack
> 8130      0.2271  libc-2.23.so             __GI_strchr
> 6357      0.1776  libc-2.23.so             _int_free
> 4152      0.1160  libc-2.23.so             re_search_internal
> 4043      0.1129  libc-2.23.so             strlen
> 2754      0.0769  libstdc++.so.6.0.21
> /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21
> 2753      0.0769  libc-2.23.so             free
> 2704      0.0755  ip_tables                /ip_tables
> 2560      0.0715  reiserfs                 /reiserfs
> 2332      0.0651  kallsyms                 ___slab_alloc
> 2284      0.0638  libc-2.23.so             malloc_consolidate
> 2204      0.0616  libc-2.23.so             malloc
> 2175      0.0608  kallsyms                 sys_epoll_ctl
> 2035      0.0568  kallsyms                 csum_partial_copy_generic
> 1614      0.0451  libc-2.23.so             calloc
> 1552      0.0434  kallsyms                 _raw_spin_lock
> 1208      0.0337  kallsyms                 memcpy
> 1203      0.0336  kallsyms                 nf_iterate
> 1177      0.0329  kallsyms                 irq_entries_start
> 1165      0.0325  kallsyms                 __fget
> 1072      0.0299  kallsyms                 copy_user_generic_string
> 1037      0.0290  kallsyms                 __alloc_skb
> 1002      0.0280  kallsyms                 tcp_sendmsg
> 945       0.0264  libc-2.23.so             build_upper_buffer
> 875       0.0244  kallsyms                 kmem_cache_free
> 873       0.0244  kallsyms                 tcp_rack_mark_lost
> 868       0.0242  nf_nat_ipv4              /nf_nat_ipv4
> 861       0.0241  kallsyms                 kfree
> 837       0.0234  kallsyms                 __inet_lookup_established
> 834       0.0233  kallsyms                 get_partial_node.isra.61
> 825       0.0230  kallsyms                 __slab_free
> 815       0.0228  kallsyms                 sock_poll
> 810       0.0226  kallsyms                 skb_release_data
> 802       0.0224  nf_conntrack_ipv4        /nf_conntrack_ipv4
> 792       0.0221  kallsyms                 tcp_transmit_skb
> 771       0.0215  kallsyms                 kmem_cache_alloc
> 719       0.0201  kallsyms                 fib_table_lookup
> 704       0.0197  kallsyms                 _raw_spin_lock_irqsave
> 701       0.0196  kallsyms                 tcp_v4_rcv
> 699       0.0195  libm-2.23.so             __ieee754_log_avx
> 686       0.0192  nf_nat                   /nf_nat
> 684       0.0191  kallsyms                 tcp_write_xmit
> 674       0.0188  kallsyms                 __cmpxchg_double_slab.isra.44
> 626       0.0175  kallsyms                 __netif_receive_skb_core
> 621       0.0173  libnettle.so.6.2
> /usr/lib/x86_64-linux-gnu/libnettle.so.6.2
> 608       0.0170  kallsyms                 delay_tsc
> 600       0.0168  kallsyms                 ksize
> 595       0.0166  kallsyms                 tcp_ack
> 592       0.0165  kallsyms                 __local_bh_enable_ip

Regards,


Antony.

-- 
Anyone that's normal doesn't really achieve much.

 - Mark Blair, Australian rocket engineer

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