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
Please reply to the list;
please *don't* CC me.
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