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When DEBUG_THREAD > 0 and task profiling enabled, we'll now measure the
time spent with at least one lock held for each task. The time is
collected by locking operations when locks are taken raising the level
to one, or released resetting the level. An accumulator is updated in
the thread_ctx struct that is collected by the scheduler when the task
returns, and updated in the sched_activity entry of the related task.
This allows to observe figures like this one:
Tasks activity over 259.516 sec till 0.000 sec ago:
function calls cpu_tot cpu_avg lkw_avg lkd_avg lat_avg
h1_io_cb 15466589 2.574m 9.984us - - 33.45us <- sock_conn_iocb@src/sock.c:1099 tasklet_wakeup
sc_conn_io_cb 8047994 8.325s 1.034us - - 870.1us <- sc_app_chk_rcv_conn@src/stconn.c:844 tasklet_wakeup
process_stream 7734689 4.356m 33.79us 1.990us 1.641us 1.554ms <- sc_notify@src/stconn.c:1206 task_wakeup
process_stream 7734292 46.74m 362.6us 278.3us 132.2us 972.0us <- stream_new@src/stream.c:585 task_wakeup
sc_conn_io_cb 7733158 46.88s 6.061us - - 68.78us <- h1_wake_stream_for_recv@src/mux_h1.c:3633 tasklet_wakeup
task_process_applet 6603593 4.484m 40.74us 16.69us 34.00us 96.47us <- sc_app_chk_snd_applet@src/stconn.c:1043 appctx_wakeup
task_process_applet 4761796 3.420m 43.09us 18.79us 39.28us 138.2us <- __process_running_peer_sync@src/peers.c:3579 appctx_wakeup
process_table_expire 4710662 4.880m 62.16us 9.648us 53.95us 158.6us <- run_tasks_from_lists@src/task.c:671 task_queue
stktable_add_pend_updates 4171868 6.786s 1.626us - 1.487us 47.94us <- stktable_add_pend_updates@src/stick_table.c:869 tasklet_wakeup
h1_io_cb 2871683 1.198s 417.0ns 70.00ns 69.00ns 1.005ms <- h1_takeover@src/mux_h1.c:5659 tasklet_wakeup
process_peer_sync 2304957 5.368s 2.328us - 1.156us 68.54us <- stktable_add_pend_updates@src/stick_table.c:873 task_wakeup
process_peer_sync 1388141 3.174s 2.286us - 1.130us 52.31us <- run_tasks_from_lists@src/task.c:671 task_queue
stktable_add_pend_updates 463488 3.530s 7.615us 2.000ns 7.134us 771.2us <- stktable_touch_with_exp@src/stick_table.c:654 tasklet_wakeup
Here we see that almost the entirety of stktable_add_pend_updates() is
spent under a lock, that 1/3 of the execution time of process_stream()
was performed under a lock and that 2/3 of it was spent waiting for a
lock (this is related to the 10 track-sc present in this config), and
that the locking time in process_peer_sync() has now significantly
reduced. This is more visible with "show profiling tasks aggr":
Tasks activity over 475.354 sec till 0.000 sec ago:
function calls cpu_tot cpu_avg lkw_avg lkd_avg lat_avg
h1_io_cb 25742539 3.699m 8.622us 11.00ns 10.00ns 188.0us
sc_conn_io_cb 22565666 1.475m 3.920us - - 473.9us
process_stream 21665212 1.195h 198.6us 140.6us 67.08us 1.266ms
task_process_applet 16352495 11.31m 41.51us 17.98us 36.55us 112.3us
process_peer_sync 7831923 17.15s 2.189us - 1.107us 41.27us
process_table_expire 6878569 6.866m 59.89us 9.359us 51.91us 151.8us
stktable_add_pend_updates 6602502 14.77s 2.236us - 2.060us 119.8us
h1_timeout_task 801 703.4us 878.0ns - - 185.7us
srv_cleanup_toremove_conns 347 12.43ms 35.82us 240.0ns 70.00ns 1.924ms
accept_queue_process 142 1.384ms 9.743us - - 340.6us
srv_cleanup_idle_conns 74 475.0us 6.418us 896.0ns 5.667us 114.6us
HAProxy
HAProxy is a free, very fast and reliable reverse-proxy offering high availability, load balancing, and proxying for TCP and HTTP-based applications.
Installation
The INSTALL file describes how to build HAProxy. A list of packages is also available on the wiki.
Getting help
The discourse and the mailing-list are available for questions or configuration assistance. You can also use the slack or IRC channel. Please don't use the issue tracker for these.
The issue tracker is only for bug reports or feature requests.
Documentation
The HAProxy documentation has been split into a number of different files for ease of use. It is available in text format as well as HTML. The wiki is also meant to replace the old architecture guide.
Please refer to the following files depending on what you're looking for:
- INSTALL for instructions on how to build and install HAProxy
- BRANCHES to understand the project's life cycle and what version to use
- LICENSE for the project's license
- CONTRIBUTING for the process to follow to submit contributions
The more detailed documentation is located into the doc/ directory:
- doc/intro.txt for a quick introduction on HAProxy
- doc/configuration.txt for the configuration's reference manual
- doc/lua.txt for the Lua's reference manual
- doc/SPOE.txt for how to use the SPOE engine
- doc/network-namespaces.txt for how to use network namespaces under Linux
- doc/management.txt for the management guide
- doc/regression-testing.txt for how to use the regression testing suite
- doc/peers.txt for the peers protocol reference
- doc/coding-style.txt for how to adopt HAProxy's coding style
- doc/internals for developer-specific documentation (not all up to date)
License
HAProxy is licensed under GPL 2 or any later version, the headers under LGPL 2.1. See the LICENSE file for a more detailed explanation.