[syslog-ng] 3.4 - degraded single threaded performance
Evan Rempel
erempel at uvic.ca
Tue Jan 22 00:22:56 CET 2013
That was not more readable, but this is :-)
8.79% syslog-ng [kernel.kallsyms] [k] unmap_vmas â—†
7.42% syslog-ng [kernel.kallsyms] [k] native_set_pte_at â–’
4.95% syslog-ng ld-2.12.so [.] do_lookup_x â–’
4.40% syslog-ng [kernel.kallsyms] [k] scsi_request_fn â–’
3.57% syslog-ng [kernel.kallsyms] [k] clear_page â–’
3.02% syslog-ng libcrypto.so.1.0.0 [.] 0xb9bae â–’
3.02% syslog-ng [kernel.kallsyms] [k] finish_task_switch â–’
2.75% syslog-ng [kernel.kallsyms] [k] __do_page_fault â–’
2.47% syslog-ng ld-2.12.so [.] _dl_update_slotinfo â–’
2.20% syslog-ng [kernel.kallsyms] [k] _spin_unlock_irqrestore â–’
1.92% syslog-ng libcrypto.so.1.0.0 [.] lh_insert â–’
1.65% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_multiplexer_queue â–’
1.65% syslog-ng libsyslog-ng-3.4.0rc2.so [.] nv_table_add_value â–’
1.65% syslog-ng ld-2.12.so [.] strcmp â–’
1.37% syslog-ng libsyslog-ng-3.4.0rc2.so [.] find_eom â–’
1.37% syslog-ng libc-2.12.so [.] _int_malloc â–’
1.10% syslog-ng libglib-2.0.so.0.2200.5 [.] g_atomic_int_add â–’
1.10% syslog-ng libc-2.12.so [.] vfprintf â–’
1.10% syslog-ng libc-2.12.so [.] memcpy â–’
1.10% syslog-ng ld-2.12.so [.] _dl_setup_hash â–’
1.10% syslog-ng ld-2.12.so [.] check_match.12442 â–’
1.10% syslog-ng ld-2.12.so [.] _dl_lookup_symbol_x â–’
1.10% syslog-ng ld-2.12.so [.] _dl_name_match_p â–’
1.10% syslog-ng [kernel.kallsyms] [k] __make_request â–’
0.82% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_msg_set_value â–’
0.82% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_reader_work_perform â–’
0.82% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_tags_inc_counter â–’
0.82% syslog-ng ld-2.12.so [.] _dl_relocate_object â–’
0.82% syslog-ng ld-2.12.so [.] __tls_get_addr â–’
0.82% syslog-ng [kernel.kallsyms] [k] native_flush_tlb â–’
0.82% syslog-ng [kernel.kallsyms] [k] error_exit â–’
0.55% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_msg_ack â–’
0.55% syslog-ng libsyslog-ng-3.4.0rc2.so [.] log_queue_fifo_push_tail â–’
0.55% syslog-ng libsyslog-ng-3.4.0rc2.so [.] nv_table_reserve_table_entry â–’
0.55% syslog-ng libsyslog-ng-3.4.0rc2.so [.] iv_inited â–’
0.55% syslog-ng libpthread-2.12.so [.] pthread_mutex_unlock â–’
0.55% syslog-ng libglib-2.0.so.0.2200.5 [.] g_static_private_get â–’
0.55% syslog-ng libc-2.12.so [.] _int_free â–’
0.55% syslog-ng libc-2.12.so [.] __strchrnul â–’
0.55% syslog-ng libc-2.12.so [.] __vsnprintf_chk â–’
0.55% syslog-ng libaffile.so [.] affile_dw_queue â–’
0.55% syslog-ng [kernel.kallsyms] [k] native_set_pmd â–’
0.55% syslog-ng [kernel.kallsyms] [k] __do_fault â–’
0.55% syslog-ng [kernel.kallsyms] [k] mmap_region â–’
0.55% syslog-ng [kernel.kallsyms] [k] kmem_cache_alloc â–’
0.55% syslog-ng [kernel.kallsyms] [k] path_put â–’
0.55% syslog-ng [kernel.kallsyms] [k] block_sync_page â–’
0.55% syslog-ng [kernel.kallsyms] [k] get_request â–’
0.55% syslog-ng [kernel.kallsyms] [k] __wait_on_bit â–’
>
> On 01/21/2013 02:49 PM, Balazs Scheidler wrote:
>> ----- Original message -----
>> > Evan Rempel <erempel at uvic.ca <mailto:erempel at uvic.ca>> writes:
>> >
>> > > I took one of my syslog-ng 3.3 configuraiton files, which happens to
>> > > read from a named pipe (/var/local/somename) and ran version 3.4rc2
>> > > against it.
>> > >
>> > > I was only able toread bout 2,000 messages/sec through the pipe.
>> > > With threaded(yes) I could read 100,000+/sec.
>> > > With syslog-ng 3.3 I could read 100,000+/sec
>> > >
>> > > Is this the expected behaviour of threaded(no) with syslog-ng 3.4
>> >
>> > Nope, it definitely is not.
>> >
>>
>> sounds like a bug to me too. I wonder how a perf output would look like.
>>
>> Does it saturate the cpu at 100% while this happens?
>>
>>
>>
>> ______________________________________________________________________________
>> Member info: https://lists.balabit.hu/mailman/listinfo/syslog-ng
>> Documentation: http://www.balabit.com/support/documentation/?product=syslog-ng
>> FAQ: http://www.balabit.com/wiki/syslog-ng-faq
>>
>
>
--
Evan Rempel erempel at uvic.ca
Senior Systems Administrator 250.721.7691
Data Centre Services, University Systems, University of Victoria
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