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Comparing JSON-XS/XS.pm (file contents):
Revision 1.128 by root, Tue Jan 19 00:31:13 2010 UTC vs.
Revision 1.129 by root, Tue Jan 19 01:02:19 2010 UTC

1324a very short single-line JSON string (also available at 1324a very short single-line JSON string (also available at
1325L<http://dist.schmorp.de/misc/json/short.json>). 1325L<http://dist.schmorp.de/misc/json/short.json>).
1326 1326
1327 {"method": "handleMessage", "params": ["user1", 1327 {"method": "handleMessage", "params": ["user1",
1328 "we were just talking"], "id": null, "array":[1,11,234,-5,1e5,1e7, 1328 "we were just talking"], "id": null, "array":[1,11,234,-5,1e5,1e7,
1329 true, false]} 1329 1, 0]}
1330 1330
1331It shows the number of encodes/decodes per second (JSON::XS uses 1331It shows the number of encodes/decodes per second (JSON::XS uses
1332the functional interface, while JSON::XS/2 uses the OO interface 1332the functional interface, while JSON::XS/2 uses the OO interface
1333with pretty-printing and hashkey sorting enabled, JSON::XS/3 enables 1333with pretty-printing and hashkey sorting enabled, JSON::XS/3 enables
1334shrink). Higher is better: 1334shrink. JSON::DWIW/DS uses the deserialise function, while JSON::DWIW::FJ
1335uses the from_json method). Higher is better:
1335 1336
1336 module | encode | decode | 1337 module | encode | decode |
1337 -----------|------------|------------| 1338 --------------|------------|------------|
1338 JSON 1.x | 4990.842 | 4088.813 | 1339 JSON::DWIW/DS | 86302.551 | 102300.098 |
1339 JSON::DWIW | 51653.990 | 71575.154 | 1340 JSON::DWIW/FJ | 86302.551 | 75983.768 |
1340 JSON::PC | 65948.176 | 74631.744 | 1341 JSON::PP | 15827.562 | 6638.658 |
1341 JSON::PP | 8931.652 | 3817.168 | 1342 JSON::Syck | 63358.066 | 47662.545 |
1342 JSON::Syck | 24877.248 | 27776.848 | 1343 JSON::XS | 511500.488 | 511500.488 |
1343 JSON::XS | 388361.481 | 227951.304 | 1344 JSON::XS/2 | 291271.111 | 388361.481 |
1344 JSON::XS/2 | 227951.304 | 218453.333 | 1345 JSON::XS/3 | 361577.931 | 361577.931 |
1345 JSON::XS/3 | 338250.323 | 218453.333 | 1346 Storable | 66788.280 | 265462.278 |
1346 Storable | 16500.016 | 135300.129 |
1347 -----------+------------+------------+ 1347 --------------+------------+------------+
1348 1348
1349That is, JSON::XS is about five times faster than JSON::DWIW on encoding, 1349That is, JSON::XS is almost six times faster than JSON::DWIW on encoding,
1350about three times faster on decoding, and over forty times faster 1350about five times faster on decoding, and over thirty to seventy times
1351than JSON, even with pretty-printing and key sorting. It also compares 1351faster than JSON's pure perl implementation. It also compares favourably
1352favourably to Storable for small amounts of data. 1352to Storable for small amounts of data.
1353 1353
1354Using a longer test string (roughly 18KB, generated from Yahoo! Locals 1354Using a longer test string (roughly 18KB, generated from Yahoo! Locals
1355search API (L<http://dist.schmorp.de/misc/json/long.json>). 1355search API (L<http://dist.schmorp.de/misc/json/long.json>).
1356 1356
1357 module | encode | decode | 1357 module | encode | decode |
1358 -----------|------------|------------| 1358 --------------|------------|------------|
1359 JSON 1.x | 55.260 | 34.971 | 1359 JSON::DWIW/DS | 1647.927 | 2673.916 |
1360 JSON::DWIW | 825.228 | 1082.513 | 1360 JSON::DWIW/FJ | 1630.249 | 2596.128 |
1361 JSON::PC | 3571.444 | 2394.829 |
1362 JSON::PP | 210.987 | 32.574 | 1361 JSON::PP | 400.640 | 62.311 |
1363 JSON::Syck | 552.551 | 787.544 | 1362 JSON::Syck | 1481.040 | 1524.869 |
1364 JSON::XS | 5780.463 | 4854.519 | 1363 JSON::XS | 20661.596 | 9541.183 |
1365 JSON::XS/2 | 3869.998 | 4798.975 | 1364 JSON::XS/2 | 10683.403 | 9416.938 |
1366 JSON::XS/3 | 5862.880 | 4798.975 | 1365 JSON::XS/3 | 20661.596 | 9400.054 |
1367 Storable | 4445.002 | 5235.027 | 1366 Storable | 19765.806 | 10000.725 |
1368 -----------+------------+------------+ 1367 --------------+------------+------------+
1369 1368
1370Again, JSON::XS leads by far (except for Storable which non-surprisingly 1369Again, JSON::XS leads by far (except for Storable which non-surprisingly
1371decodes faster). 1370decodes a bit faster).
1372 1371
1373On large strings containing lots of high Unicode characters, some modules 1372On large strings containing lots of high Unicode characters, some modules
1374(such as JSON::PC) seem to decode faster than JSON::XS, but the result 1373(such as JSON::PC) seem to decode faster than JSON::XS, but the result
1375will be broken due to missing (or wrong) Unicode handling. Others refuse 1374will be broken due to missing (or wrong) Unicode handling. Others refuse
1376to decode or encode properly, so it was impossible to prepare a fair 1375to decode or encode properly, so it was impossible to prepare a fair

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