[tor-bugs] #4626 [Tor Directory Authority]: Very high cpu usage for gabelmoo running master

[Tor Bug Tracker & Wiki]

#4626: Very high cpu usage for gabelmoo running master
-------------------------------------+--------------------------------------
 Reporter:  Sebastian                |          Owner:                    
     Type:  defect                   |         Status:  new               
 Priority:  normal                   |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Directory Authority  |        Version:                    
 Keywords:                           |         Parent:                    
   Points:                           |   Actualpoints:                    
-------------------------------------+--------------------------------------

Comment(by Sebastian):

 And I've managed to get the libc broken down. Looks like stuff from
 outside Tor got put in. Here we go with a better profile.

 {{{

 samples  %        image name               symbol name
 816064   10.3630  tor                      sha1_block_data_order
 326831    4.1503  tor                      lh_retrieve
 270685    3.4374  libevent-2.1.so.1.0.0    event_base_loop
 266122    3.3794  tor                      CRYPTO_THREADID_cmp
 256188    3.2533  tor                      CRYPTO_lock
 246810    3.1342  tor                      ssleay_rand_add
 198834    2.5249  tor                      bn_mul_mont
 176971    2.2473  tor                      EVP_DigestInit_ex
 171173    2.1737  tor                      ssl3_read_n
 156014    1.9812  tor                      ERR_clear_error
 155584    1.9757  tor                      SHA1_Update
 148804    1.8896  tor                      ssl3_read_bytes
 144783    1.8386  libc-2.11.2.so           memcpy
 138239    1.7555  libevent-2.1.so.1.0.0
 event_process_active_single_queue
 121508    1.5430  libevent-2.1.so.1.0.0    epoll_dispatch
 110935    1.4087  tor                      assert_connection_ok
 108831    1.3820  tor                      connection_handle_write
 104542    1.3276  libc-2.11.2.so           _int_free
 102253    1.2985  tor                      int_thread_get_item
 98278     1.2480  libc-2.11.2.so           malloc
 97648     1.2400  libevent-2.1.so.1.0.0    event_pending
 96666     1.2275  tor                      conn_write_callback
 96345     1.2235  tor                      ssl3_setup_read_buffer
 95187     1.2088  tor                      tor_tls_write
 90558     1.1500  tor                      connection_bucket_round_robin
 87150     1.1067  tor                      flush_buf_tls
 86564     1.0993  tor                      SHA1_Final
 85288     1.0831  libevent-2.1.so.1.0.0    gettime
 83158     1.0560  libc-2.11.2.so           memset
 82328     1.0455  tor                      connection_bucket_write_limit
 82056     1.0420  tor                      _log_fn
 81218     1.0314  [vdso] (tgid:13332 range:0x7fff9719a000-0x7fff9719b000)
 [vdso] (tgid:13332 range:0x7fff9719a000-0x7fff9719b000)
 79000     1.0032  libc-2.11.2.so           _int_malloc
 76371     0.9698  tor                      ssl3_accept
 72840     0.9250  tor                      ssl3_release_read_buffer
 69932     0.8880  tor                      BIO_read
 67766     0.8605  tor                      tor_addr_is_internal
 66815     0.8485  tor                      get_error_values
 65876     0.8365  libc-2.11.2.so           __read_nocancel
 64578     0.8201  libevent-2.1.so.1.0.0    event_queue_remove_active
 63060     0.8008  tor                      EVP_DigestFinal_ex
 62984     0.7998  tor                      ssl3_get_message
 61671     0.7831  tor                      CRYPTO_malloc
 60856     0.7728  tor                      SHA1_Init
 60739     0.7713  libevent-2.1.so.1.0.0    evmap_io_active
 57774     0.7337  tor                      CRYPTO_add_lock
 57171     0.7260  tor                      EVP_MD_CTX_init
 56716     0.7202  tor                      EVP_MD_CTX_cleanup
 53904     0.6845  tor                      OPENSSL_cleanse
 53697     0.6819  libc-2.11.2.so           free
 49858     0.6331  tor                      engine_table_select
 49590     0.6297  tor                      ssl3_write_bytes
 49328     0.6264  libc-2.11.2.so           __epoll_wait_nocancel
 48919     0.6212  libevent-2.1.so.1.0.0    event_active_nolock
 47917     0.6085  tor                      assert_buf_ok
 47879     0.6080  tor                      tor_tls_get_error
 45525     0.5781  libc-2.11.2.so           __errno_location
 45152     0.5734  tor                      int_thread_get
 45064     0.5723  libc-2.11.2.so           read
 43563     0.5532  tor                      sock_read
 40059     0.5087  tor                      int_thread_release
 39132     0.4969  tor                      ERR_get_state
 38059     0.4833  tor                      SSL_get_error
 }}}

 I still have no idea what tor is actually *DOING* here, there is
 absolutely no reason to spend all this cpu

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/4626#comment:7>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online