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Last active Dec 29, 2015
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out_forward って詰まると性能劣化する?

設定

td-agent 1.1.17

ログ生成

https://github.com/sonots/dummy_log_generator を使用し、-r 100000 や -r 200000 と指定。実際に20万lines/sec吐き出せていることはもちろん確認済み。

送信側

out_forward に https://gist.github.com/sonots/7646378https://gist.github.com/sonots/7662371 のパッチをあててログを出すようにしている。最終品は https://gist.github.com/sonots/7670640 にある。

<source>
  type tail
  path /var/log/dummy.log
  pos_file /var/tmp/_var_log_dummy.pos
  format none
  tag dummy
</source>
<match dummy>
  type forward
  flush_interval 0
  buffer_queue_limit 10
  buffer_chunk_limit 1g
  # num_threads 1
  retry_wait 0.1
  retry_limit 17
  max_retry_wait 0
  # phi_threshold 35
  <server>
    host 10.33.145.22
    port 20000
  </server>
</match>

受信側

in_forward にログを出すパッチ https://gist.github.com/sonots/7644438 を作ってみたが、https://github.com/sonots/fluent-plugin-flowcounter-simple で十分計測できそうだったのでそちらを使用。flowcounter-simple は flowcounter の簡易版。

<source>
  type forward
  port 20000
</source>
<match dummy>
  type copy
  <store>
    type flowcounter_simple
    unit second
    indicator byte
  </store>
  <store>
    type flowcounter_simple
    unit second
    indicator num
  </store>
</match>

ログ速度 10万 lines / sec

送信側

timing:try が #send_data を呼んだタイミング、timing:sent が #send_data が終了したタイミング。 timing:second は毎秒送信したデータ量をログ吐き出しする Thread のログである(0 の場合は出力しない)

内部実装の都合上、行数ではなくバイト数を出力している。

10万 lines / sec の場合は大体毎秒データが流れていて問題なさそう。

2013-11-27 13:09:02 +0900 [info]: plugin:out_forward	size:8260000	timing:try
2013-11-27 13:09:02 +0900 [info]: plugin:out_forward	size:8260000	timing:sent
2013-11-27 13:09:03 +0900 [info]: plugin:out_forward	size:8260000	timing:second
2013-11-27 13:09:03 +0900 [info]: plugin:out_forward	size:12980000	timing:try
2013-11-27 13:09:04 +0900 [info]: plugin:out_forward	size:12980000	timing:sent
2013-11-27 13:09:04 +0900 [info]: plugin:out_forward	size:2360000	timing:try
2013-11-27 13:09:04 +0900 [info]: plugin:out_forward	size:2360000	timing:sent
2013-11-27 13:09:04 +0900 [info]: plugin:out_forward	size:15340000	timing:second
2013-11-27 13:09:05 +0900 [info]: plugin:out_forward	size:11800000	timing:try
2013-11-27 13:09:05 +0900 [info]: plugin:out_forward	size:11800000	timing:sent
2013-11-27 13:09:06 +0900 [info]: plugin:out_forward	size:11800000	timing:second
2013-11-27 13:09:06 +0900 [info]: plugin:out_forward	size:12980000	timing:try
2013-11-27 13:09:06 +0900 [info]: plugin:out_forward	size:12980000	timing:sent
2013-11-27 13:09:07 +0900 [info]: plugin:out_forward	size:12980000	timing:second
2013-11-27 13:09:07 +0900 [info]: plugin:out_forward	size:14160000	timing:try
2013-11-27 13:09:07 +0900 [info]: plugin:out_forward	size:14160000	timing:sent
2013-11-27 13:09:08 +0900 [info]: plugin:out_forward	size:14160000	timing:second
2013-11-27 13:09:08 +0900 [info]: plugin:out_forward	size:14160000	timing:try
2013-11-27 13:09:08 +0900 [info]: plugin:out_forward	size:14160000	timing:sent
2013-11-27 13:09:09 +0900 [info]: plugin:out_forward	size:14160000	timing:second
2013-11-27 13:09:09 +0900 [info]: plugin:out_forward	size:14160000	timing:try
2013-11-27 13:09:10 +0900 [info]: plugin:out_forward	size:14160000	timing:sent
2013-11-27 13:09:10 +0900 [info]: plugin:out_forward	size:2360000	timing:try
2013-11-27 13:09:10 +0900 [info]: plugin:out_forward	size:2360000	timing:sent
2013-11-27 13:09:10 +0900 [info]: plugin:out_forward	size:16520000	timing:second
2013-11-27 13:09:11 +0900 [info]: plugin:out_forward	size:11800000	timing:try
2013-11-27 13:09:11 +0900 [info]: plugin:out_forward	size:11800000	timing:sent
2013-11-27 13:09:12 +0900 [info]: plugin:out_forward	size:11800000	timing:second
2013-11-27 13:09:12 +0900 [info]: plugin:out_forward	size:12980000	timing:try
2013-11-27 13:09:12 +0900 [info]: plugin:out_forward	size:12980000	timing:sent
2013-11-27 13:09:13 +0900 [info]: plugin:out_forward	size:12980000	timing:second
2013-11-27 13:09:13 +0900 [info]: plugin:out_forward	size:14160000	timing:try
2013-11-27 13:09:13 +0900 [info]: plugin:out_forward	size:14160000	timing:sent
2013-11-27 13:09:14 +0900 [info]: plugin:out_forward	size:14160000	timing:second

受信側

bytes / sec および lines / sec を出している

2013-11-27 13:09:03 +0900 [info]: plugin:out_flowcounter_simple	count:70000	indicator:num	unit:second
2013-11-27 13:09:03 +0900 [info]: plugin:out_flowcounter_simple	count:7840000	indicator:byte	unit:second
2013-11-27 13:09:05 +0900 [info]: plugin:out_flowcounter_simple	count:14560000	indicator:byte	unit:second
2013-11-27 13:09:05 +0900 [info]: plugin:out_flowcounter_simple	count:130000	indicator:num	unit:second
2013-11-27 13:09:06 +0900 [info]: plugin:out_flowcounter_simple	count:11200000	indicator:byte	unit:second
2013-11-27 13:09:06 +0900 [info]: plugin:out_flowcounter_simple	count:100000	indicator:num	unit:second
2013-11-27 13:09:07 +0900 [info]: plugin:out_flowcounter_simple	count:110000	indicator:num	unit:second
2013-11-27 13:09:07 +0900 [info]: plugin:out_flowcounter_simple	count:12320000	indicator:byte	unit:second
2013-11-27 13:09:08 +0900 [info]: plugin:out_flowcounter_simple	count:120000	indicator:num	unit:second
2013-11-27 13:09:08 +0900 [info]: plugin:out_flowcounter_simple	count:13440000	indicator:byte	unit:second
2013-11-27 13:09:09 +0900 [info]: plugin:out_flowcounter_simple	count:13440000	indicator:byte	unit:second
2013-11-27 13:09:10 +0900 [info]: plugin:out_flowcounter_simple	count:120000	indicator:num	unit:second
2013-11-27 13:09:11 +0900 [info]: plugin:out_flowcounter_simple	count:140000	indicator:num	unit:second
2013-11-27 13:09:11 +0900 [info]: plugin:out_flowcounter_simple	count:15680000	indicator:byte	unit:second
2013-11-27 13:09:12 +0900 [info]: plugin:out_flowcounter_simple	count:100000	indicator:num	unit:second
2013-11-27 13:09:12 +0900 [info]: plugin:out_flowcounter_simple	count:11200000	indicator:byte	unit:second
2013-11-27 13:09:13 +0900 [info]: plugin:out_flowcounter_simple	count:110000	indicator:num	unit:second
2013-11-27 13:09:13 +0900 [info]: plugin:out_flowcounter_simple	count:12320000	indicator:byte	unit:second
2013-11-27 13:09:14 +0900 [info]: plugin:out_flowcounter_simple	count:120000	indicator:num	unit:second
2013-11-27 13:09:14 +0900 [info]: plugin:out_flowcounter_simple	count:13440000	indicator:byte	unit:second
2013-11-27 13:09:15 +0900 [info]: plugin:out_flowcounter_simple	count:50000	indicator:num	unit:second
2013-11-27 13:09:15 +0900 [info]: plugin:out_flowcounter_simple	count:5600000	indicator:byte	unit:second

ログ速度 20万 lines / sec

10万 lines / sec の場合は、大体毎秒データが流れたが、一旦詰まると try してから sent になるまで2分以上かかり、性能が急激に劣化する。元々捌けていた 10万 lines / sec も捌けていないし、まとめてデータを送る挙動になるのもうれしくない。

なお、最終的には queue size limit exceeds エラーが出る。

なお、flush_interval 0buffer_chunk_limit 1g および max_retry_wait 0 とし、がんがんデータを送る設定にして実験している。もちろん max_retry_wait の設定ありなしなど試したが大まかな挙動は変わらなかった。

送信側

2013-11-27 13:26:01 +0900 [info]: plugin:out_forward	size:6460264	timing:try
2013-11-27 13:26:03 +0900 [info]: plugin:out_forward	size:6460264	timing:sent
2013-11-27 13:26:03 +0900 [info]: plugin:out_forward	size:37446002	timing:try
2013-11-27 13:26:04 +0900 [info]: plugin:out_forward	size:6460264	timing:second
2013-11-27 13:26:15 +0900 [info]: plugin:out_forward	size:37446002	timing:sent
2013-11-27 13:26:15 +0900 [info]: plugin:out_forward	size:187110122	timing:try
2013-11-27 13:26:15 +0900 [info]: plugin:out_forward	size:37446002	timing:second
2013-11-27 13:26:45 +0900 [info]: plugin:out_forward	size:187110122	timing:sent
2013-11-27 13:26:45 +0900 [info]: plugin:out_forward	size:481892412	timing:try
2013-11-27 13:26:46 +0900 [info]: plugin:out_forward	size:187110122	timing:second
2013-11-27 13:28:17 +0900 [info]: plugin:out_forward	size:481892412	timing:sent
2013-11-27 13:28:17 +0900 [info]: plugin:out_forward	size:481892412	timing:second
2013-11-27 13:28:18 +0900 [info]: plugin:out_forward	size:1073729790	timing:try
2013-11-27 13:30:14 +0900 [info]: plugin:out_forward	size:1073729790	timing:sent
2013-11-27 13:30:14 +0900 [info]: plugin:out_forward	size:1073729790	timing:second
2013-11-27 13:30:15 +0900 [info]: plugin:out_forward	size:1073729908	timing:try
2013-11-27 13:33:47 +0900 [info]: plugin:out_forward	size:1073729908	timing:sent
2013-11-27 13:33:47 +0900 [info]: plugin:out_forward	size:1073729908	timing:second
2013-11-27 13:33:48 +0900 [info]: plugin:out_forward	size:1073729908	timing:try
2013-11-27 13:35:52 +0900 [info]: plugin:out_forward	size:1073729908	timing:sent
2013-11-27 13:35:52 +0900 [info]: plugin:out_forward	size:1073729908	timing:second
2013-11-27 13:35:53 +0900 [info]: plugin:out_forward	size:1073729908	timing:try

CPU使用率

100%超えるとこうなる。検証環境では 15万 lines/sec ぐらいでこうなった。

$ top -c
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  43094 td-agent  20   0 1474m 1.1g 2620 S 103.8  4.8  22:17.38 /usr/lib64/fluent/ruby/bin/ruby /usr/sbin/td-agent --group td-agent --log /var/log/td-agent/td-agent.log --daemon /var/run/td-agent/td-agent.pid 

NWとか

$ dstat
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw 
  1   0  99   0   0   0|  16k  333k|   0     0 |  49B   58B|1376  1038 
  4   1  95   0   0   0|   0     0 | 146k 9426k|   0     0 |6231    29k
  3   1  96   0   0   0|   0   112k| 133k 8603k|   0     0 |5763    27k
  5   1  93   0   0   0|   0    68k| 123k 8015k|   0     0 |7914    33k
  3   1  96   0   0   0|   0     0 | 164k   10M|   0     0 |5993    28k
  5   2  93   0   0   0|   0     0 | 129k 8365k|   0     0 |5929    28k
  3   1  97   0   0   0|   0     0 | 126k 8261k|   0     0 |6322    29k
  5   1  94   0   0   0|   0    68k| 100k 9416k|   0     0 |4512    29k
  3   1  96   0   0   0|   0     0 | 118k 9970k|   0     0 |7228    33k
  6   2  92   0   0   0|   0     0 | 173k   11M|   0     0 |7003    32k

受信側

9099405 lines を3分半かけて受け取っている。9099405 / 210 = 43,330 程度で、10万 lines 行ってない。

2013-11-27 13:26:04 +0900 [info]: plugin:out_flowcounter_simple	count:54748	indicator:num	unit:second
2013-11-27 13:26:04 +0900 [info]: plugin:out_flowcounter_simple	count:6131776	indicator:byte	unit:second
2013-11-27 13:26:16 +0900 [info]: plugin:out_flowcounter_simple	count:317339	indicator:num	unit:second
2013-11-27 13:26:16 +0900 [info]: plugin:out_flowcounter_simple	count:35541968	indicator:byte	unit:second
2013-11-27 13:26:49 +0900 [info]: plugin:out_flowcounter_simple	count:177596048	indicator:byte	unit:second
2013-11-27 13:26:50 +0900 [info]: plugin:out_flowcounter_simple	count:1585679	indicator:num	unit:second
2013-11-27 13:28:25 +0900 [info]: plugin:out_flowcounter_simple	count:457389408	indicator:byte	unit:second
2013-11-27 13:28:30 +0900 [info]: plugin:out_flowcounter_simple	count:4083834	indicator:num	unit:second
2013-11-27 13:30:32 +0900 [info]: plugin:out_flowcounter_simple	count:1019133360	indicator:byte	unit:second
2013-11-27 13:30:43 +0900 [info]: plugin:out_flowcounter_simple	count:9099405	indicator:num	unit:second
2013-11-27 13:34:06 +0900 [info]: plugin:out_flowcounter_simple	count:1019133472	indicator:byte	unit:second
2013-11-27 13:34:17 +0900 [info]: plugin:out_flowcounter_simple	count:9099406	indicator:num	unit:second
2013-11-27 13:36:12 +0900 [info]: plugin:out_flowcounter_simple	count:1019133472	indicator:byte	unit:second
2013-11-27 13:36:24 +0900 [info]: plugin:out_flowcounter_simple	count:9099406	indicator:num	unit:second

CPU使用率

$ top -c
 4076 td-agent  20   0 4285m 2.6g 2600 S  8.6 11.0  17:11.20 /usr/lib64/fluent/ruby/bin/ruby /usr/sbin/td-agent --group td-agent --log /var/log/td-agent/td-agent.log --daemon /var/run/td-agent/td-agent.pid 

NWとか

$ dstat
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw 
  1   0  99   0   0   0| 187B   33k|   0     0 |   0     0 |1340   700 
  0   0 100   0   0   0|   0     0 |  13M  201k|   0     0 |6838  6523 
  0   0  99   0   0   0|   0     0 |  13M  201k|   0     0 |6781  6461 
  1   0  99   0   0   0|   0   396k|  13M  149k|   0     0 |5833  4286 
  1   1  98   0   0   0|   0     0 |  12M  158k|   0     0 |5998  5210 
  0   1  99   0   0   0|   0     0 |  13M  207k|   0     0 |  11k 9761 
  0   0  99   0   0   0|   0     0 |  13M  198k|   0     0 |6761  6445 
  0   0 100   0   0   0|   0     0 |  12M  192k|   0     0 |6428  6106 
  0   1  99   0   0   0|   0   144k|  11M  166k|   0     0 |5664  5446 

num_threads を増やしてみる

num_threads 2 であまり変わった気がしなかったので思い切って 32 にした。

3分半の詰まりが1分ぐらいには縮まったが。。。

送信側

2013-11-27 14:57:42 +0900 [info]: plugin:out_forward	size:1435588	timing:sent
2013-11-27 14:57:42 +0900 [info]: plugin:out_forward	size:3828274	timing:try
2013-11-27 14:57:42 +0900 [info]: plugin:out_forward	size:1435588	timing:second
2013-11-27 14:57:43 +0900 [info]: plugin:out_forward	size:3828274	timing:sent
2013-11-27 14:57:43 +0900 [info]: plugin:out_forward	size:24166400	timing:try
2013-11-27 14:57:43 +0900 [info]: plugin:out_forward	size:3828274	timing:second
2013-11-27 14:57:48 +0900 [info]: plugin:out_forward	size:24166400	timing:sent
2013-11-27 14:57:48 +0900 [info]: plugin:out_forward	size:76686548	timing:try
2013-11-27 14:57:48 +0900 [info]: plugin:out_forward	size:24166400	timing:second
2013-11-27 14:58:10 +0900 [info]: plugin:out_forward	size:76686548	timing:sent
2013-11-27 14:58:10 +0900 [info]: plugin:out_forward	size:340961590	timing:try
2013-11-27 14:58:10 +0900 [info]: plugin:out_forward	size:76686548	timing:second
2013-11-27 14:59:17 +0900 [info]: plugin:out_forward	size:1073729790	timing:try
2013-11-27 14:59:27 +0900 [info]: plugin:out_forward	size:340961590	timing:sent
2013-11-27 14:59:28 +0900 [info]: plugin:out_forward	size:340961590	timing:second
2013-11-27 15:00:26 +0900 [info]: plugin:out_forward	size:1073729908	timing:try
2013-11-27 15:01:35 +0900 [info]: plugin:out_forward	size:1073729908	timing:try
2013-11-27 15:02:44 +0900 [info]: plugin:out_forward	size:1073729908	timing:try
2013-11-27 15:03:17 +0900 [info]: plugin:out_forward	size:1073729790	timing:sent
2013-11-27 15:03:17 +0900 [info]: plugin:out_forward	size:1073729790	timing:second

CPU使用率

$ top -c
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
  62317 td-agent  20   0 6037m 3.8g 2640 S 105.6 16.0   4:50.71 /usr/lib64/fluent/ruby/bin/ruby /usr/sbin/td-agent --group td-agent --log /var/log/td-agent/td-agent.log --daemon /var/run/td-agent/td-agent.pid

NWとか

$ dstat
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system--
usr sys idl wai hiq siq| read  writ| recv  send|  in   out | int   csw 
  1   0  99   0   0   0|  25k  358k|   0     0 |  61B   72B|1383  1061 
  6   0  94   0   0   0|   0   112k| 186k   11M|   0     0 |9509    27k
  4   0  96   0   0   0|   0     0 | 144k 8837k|   0     0 |5568    25k
  2   0  97   0   0   0|   0     0 | 112k 7185k|   0     0 |2709    18k
  4   0  95   0   0   0|   0    12k|  37k 2406k|   0     0 |2648    18k
  3   0  97   0   0   0|   0     0 |  36k 2402k|   0     0 |2797    18k
  3   0  96   0   0   0|   0    40k|  42k 2890k|   0     0 |2525    17k
  3   0  97   0   0   0|   0     0 |  37k 2381k|   0     0 |2729    18k
  4   0  96   0   0   0|   0     0 |  41k 2602k|   0     0 |2788    18k
  2   0  97   0   0   0|   0     0 |  41k 2711k|   0     0 |2750    18k
  4   0  96   0   0   0|   0     0 |  42k 2669k|   0     0 |2668    18k
  3   0  97   0   0   0|   0    28k|  40k 2627k|   0     0 |2757    18k

受信側

2013-11-27 14:56:46 +0900 [info]: plugin:out_flowcounter_simple	count:11695936	indicator:byte	unit:second
2013-11-27 14:56:46 +0900 [info]: plugin:out_flowcounter_simple	count:104428	indicator:num	unit:second
2013-11-27 14:56:54 +0900 [info]: plugin:out_flowcounter_simple	count:68472096	indicator:byte	unit:second
2013-11-27 14:56:54 +0900 [info]: plugin:out_flowcounter_simple	count:611358	indicator:num	unit:second
2013-11-27 14:57:21 +0900 [info]: plugin:out_flowcounter_simple	count:100266880	indicator:byte	unit:second
2013-11-27 14:57:23 +0900 [info]: plugin:out_flowcounter_simple	count:895240	indicator:num	unit:second
2013-11-27 14:57:35 +0900 [info]: plugin:out_flowcounter_simple	count:414144528	indicator:byte	unit:second
2013-11-27 14:57:39 +0900 [info]: plugin:out_flowcounter_simple	count:3697719	indicator:num	unit:second
2013-11-27 14:57:43 +0900 [info]: plugin:out_flowcounter_simple	count:12166	indicator:num	unit:second
2013-11-27 14:57:43 +0900 [info]: plugin:out_flowcounter_simple	count:1362592	indicator:byte	unit:second
2013-11-27 14:57:44 +0900 [info]: plugin:out_flowcounter_simple	count:32443	indicator:num	unit:second
2013-11-27 14:57:44 +0900 [info]: plugin:out_flowcounter_simple	count:3633616	indicator:byte	unit:second
2013-11-27 14:57:49 +0900 [info]: plugin:out_flowcounter_simple	count:204800	indicator:num	unit:second
2013-11-27 14:57:49 +0900 [info]: plugin:out_flowcounter_simple	count:22937600	indicator:byte	unit:second
2013-11-27 14:58:11 +0900 [info]: plugin:out_flowcounter_simple	count:72787232	indicator:byte	unit:second
2013-11-27 14:58:12 +0900 [info]: plugin:out_flowcounter_simple	count:649886	indicator:num	unit:second
2013-11-27 14:59:34 +0900 [info]: plugin:out_flowcounter_simple	count:323624560	indicator:byte	unit:second
2013-11-27 14:59:37 +0900 [info]: plugin:out_flowcounter_simple	count:2889505	indicator:num	unit:second
2013-11-27 15:03:35 +0900 [info]: plugin:out_flowcounter_simple	count:1019133360	indicator:byte	unit:second
2013-11-27 15:03:47 +0900 [info]: plugin:out_flowcounter_simple	count:9099405	indicator:num	unit:second

buffer_chunk_limit を逆に小さくしてみる

chunk のサイズを小さくして、buffer_queue_limit を大きくしてみる。

結果、許容サイズを超えた場合の挙動に、詰まりがなくなりスムースにデータが流れた。ただし、スループットは落ちた。

設定

<source>
  type tail
  path /var/log/dummy.log
  pos_file /var/tmp/_var_log_dummy.pos
  format none
  tag dummy
</source>
<match dummy>
  type forward
  flush_interval 0
  buffer_queue_limit 10240
  buffer_chunk_limit 1m
  num_threads 32
  retry_wait 0.1
  retry_limit 17
  max_retry_wait 0
  # phi_threshold 35
  <server>
    host 10.33.145.22
    port 20000
  </server>
</match>

送信側

2013-11-27 17:10:51 +0900 [info]: plugin:out_forward	size:9570862	timing:second
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受信側

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@sonots sonots commented Nov 27, 2013

CPU使用率とNWとか追記ed

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