Does rti/FastXml, or anything like it, work with rails 3 to speed-up xml rendering?

Tests of a few rails 3 config options, via ab : XmlMini_LibXML XmlMini_Nokogiri fast_xs.

Tests of a few rails 3 config options, via ab: XmlMini_LibXML, XmlMini_Nokogiri, fast_xs. The following request returns about 50k of search results in the form of nested ruby hashes, with the data coming from memcached, so that the time differences here are in encoding the results into xml or json. Ab -n 100 -c 5 "DOMAIN/PATH.(xml|json)" SUMMARY: Adding gem fast_xs appears to cut XML time in half, others have no effect.

JSON (yajl) min mean+/-sd median max Connect: 0 1 2.7 0 20 Processing: 159 453 188.6 387 994 Waiting: 155 444 188.4 380 992 Total: 160 454 188.6 387 995 XML (rails 3.0.3 defaults) min mean+/-sd median max Connect: 0 1 2.6 0 10 Processing: 377 1256 337.5 1260 2612 Waiting: 367 1233 335.7 1230 2597 Total: 378 1258 337.3 1260 2613 XML (XmlMini_LibXML) min mean+/-sd median max Connect: 0 1 2.3 0 13 Processing: 479 1217 233.8 1251 1830 Waiting: 473 1188 235.3 1229 1826 Total: 479 1218 234.0 1252 1835 XML (XmlMini_Nokogiri) min mean+/-sd median max Connect: 0 1 1.8 0 10 Processing: 701 1211 228.1 1259 1654 Waiting: 695 1197 224.8 1251 1650 Total: 701 1212 228.4 1261 1655 XML (defaults + fast_xs) min mean+/-sd median max Connect: 0 1 1.9 0 10 Processing: 243 656 233.1 702 1288 Waiting: 238 627 236.7 585 1286 Total: 250 657 233.3 702 1289 XML (XmlMini_LibXML + fast_xs) min mean+/-sd median max Connect: 0 1 1.8 0 10 Processing: 256 685 222.6 704 1138 Waiting: 234 650 229.5 661 1132 Total: 257 686 222.7 705 1138 XML (XmlMini_Nokogiri + fast_xs) min mean+/-sd median max Connect: 0 2 3.9 0 23 Processing: 210 657 224.7 714 1118 Waiting: 206 610 229.9 607 1094 Total: 210 659 225.0 716 1119 JSON (yajl + fast_xs) min mean+/-sd median max Connect: 0 1 1.8 0 11 Processing: 153 442 197.1 396 1129 Waiting: 148 435 196.3 391 1124 Total: 153 442 197.3 398 1136.

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