Use Performance and Debug Logging

The client logs all network traffic (requests sent, responses received) and interactions with its cache, if present. This can be especially useful for measuring speed and identifying bottlenecks.

Turn on client logging

from tiled.client import show_logs

show_logs()

Note

This uses the Python standard library’s logging framework. The show_logs() function is just a convenience function that does some simple logging configuration. It will not affect the logging behavior of any other parts of your program; it does not alter any global logging configuration.

Requests (->) and responses (<-) will now be logged to the console, like so.

>>> c = from_uri("https://tiled-demo.blueskyproject.io")
16:49:22.307 -> GET 'https://tiled-demo.blueskyproject.io/?root_path=true' 'host:tiled-demo.blueskyproject.io' 'accept:*/*' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49'
16:49:22.486 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:49:22 GMT content-type:application/json content-length:761 connection:keep-alive etag:35b70c6412c39db8b7b5132ddf61973c expires:Tue, 01 Feb 2022 21:59:22 GMT content-encoding:gzip vary:Accept-Encoding server-timing:tok;dur=0.1, pack;dur=0.0, compress;dur=0.1;ratio=3.1, app;dur=3.9 set-cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM; HttpOnly; Path=/; SameSite=lax
16:49:22.492 -> GET 'https://tiled-demo.blueskyproject.io/?root_path=true' 'host:tiled-demo.blueskyproject.io' 'accept:application/x-msgpack' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49' 'cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM'
16:49:22.531 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:49:22 GMT content-type:application/x-msgpack content-length:773 connection:keep-alive etag:35b70c6412c39db8b7b5132ddf61973c expires:Tue, 01 Feb 2022 21:59:22 GMT content-encoding:gzip vary:Accept-Encoding server-timing:tok;dur=0.1, pack;dur=0.0, compress;dur=0.1;ratio=2.7, app;dur=4.5
16:49:22.535 -> GET 'https://tiled-demo.blueskyproject.io/node/metadata/' 'host:tiled-demo.blueskyproject.io' 'accept:application/x-msgpack' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49' 'cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM'
16:49:22.572 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:49:22 GMT content-type:application/x-msgpack content-length:292 connection:keep-alive etag:821dd2a8b431ecd016f94cacd44af74f server-timing:tok;dur=0.0, pack;dur=0.0, app;dur=3.8

>>> t = c['generated']['short_table']
16:58:22.589 -> GET 'https://tiled-demo.blueskyproject.io/node/search/?filter%5Blookup%5D%5Bcondition%5D%5Bkey%5D=generated&sort=' 'host:tiled-demo.blueskyproject.io' 'accept:application/x-msgpack' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49.post0.dev0+g6dd1e5f' 'cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM'
16:58:22.635 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:58:22 GMT content-type:application/x-msgpack content-length:502 connection:keep-alive etag:53a7b8a84ec504259a8c29903a25ade0 server-timing:tok;dur=0.0, pack;dur=0.0, app;dur=5.9
16:58:22.638 -> GET 'https://tiled-demo.blueskyproject.io/node/search/generated?filter%5Blookup%5D%5Bcondition%5D%5Bkey%5D=short_table&sort=' 'host:tiled-demo.blueskyproject.io' 'accept:application/x-msgpack' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49.post0.dev0+g6dd1e5f' 'cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM'
16:58:22.681 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:58:22 GMT content-type:application/x-msgpack content-length:944 connection:keep-alive etag:8d81b7891000606ceeb87fa89689c045 content-encoding:gzip vary:Accept-Encoding server-timing:acl;dur=0.0, tok;dur=0.1, pack;dur=0.0, compress;dur=0.1;ratio=4.5, app;dur=12.0

>>> t.read()
16:58:27.134 -> GET 'https://tiled-demo.blueskyproject.io/dataframe/partition/generated/short_table?partition=0' 'host:tiled-demo.blueskyproject.io' 'accept:application/vnd.apache.arrow.file' 'accept-encoding:gzip,blosc' 'connection:keep-alive' 'user-agent:python-tiled/0.1.0a49.post0.dev0+g6dd1e5f' 'cookie:tiled_csrf=-fyaLez0YkradgcEVYBJh4QotR5MNyzouV0SV0NWHmM'
16:58:27.205 <- 200 server:nginx/1.18.0 (Ubuntu) date:Tue, 01 Feb 2022 21:58:27 GMT content-type:application/vnd.apache.arrow.file content-length:3847 connection:keep-alive etag:954688a8ef55915b012bba1e93769710 content-encoding:blosc vary:Accept-Encoding server-timing:acl;dur=0.0, read;dur=1.4, tok;dur=0.2, pack;dur=0.8, compress;dur=0.0;ratio=1.4, app;dur=9.1
              A         B         C
index
0      0.380618  0.761235  1.141853
1      0.259924  0.519848  0.779772
2      0.299569  0.599138  0.898707
3      0.469430  0.938859  1.408289
4      0.582898  1.165797  1.748695
...         ...       ...       ...
95     0.749854  1.499709  2.249563
96     0.279548  0.559096  0.838644
97     0.649457  1.298913  1.948370
98     0.481953  0.963907  1.445860
99     0.246197  0.492393  0.738590

[100 rows x 3 columns]

Examine server performance with server-timing

The server-timing header is especially useful. While the tiled server is handling our request, it records the time taken during each step of the process. For example, at the end of the last line of the logs shown above, we see:

server-timing:acl;dur=0.0, read;dur=1.4, tok;dur=0.2, pack;dur=0.8, compress;dur=0.0;ratio=1.4, app;dur=9.1

This follows a standard syntax. The time units are milliseconds.

At the end of the line, app;dur= gives the total time, measured from when the tiled server first received the client’s request to the moment it began transmitting its response. We can separate application time from network time by cross-referencing this number with the timestamps at the left of each log line.

The item…

  • acl gives time spent in authentication and access control enforcement;

  • read gives time spent accessing the data;

  • tok gives the time spent producing a fingerprint used for cache invalidation;

  • pack gives the time spent encoding the data in the requested format;

  • compress gives both the time spent compressing and the compression ratio achieved (higher is better).

Turn off client logging

This undoes the logging configuration performed by show_logs(). It does not affect any other logging configuration.

from tiled.client import hide_logs

hide_logs()