Hi folks, According to our evaluation and analysis by combining the existing work [1] from Teddy Choi and Owen O'Malley with some new compression codec (e.g. ZSTD and Brotli), we proposed to prompt FLIP as the default encoding for ORC double type to move this feature forwards. Currently we have five kinds of supported double encoding optimizations: plain v2, FPC_v1, FPC_v2, FLIP, Split [1]. Equipping with various encoding can handle different use scenarios but it will increase the burdens from end point users to make a "smart" choice. It's very necessary to have a preference as the default encoding type. To choose the "best" encoding among those encodings, two major factors needed to be considered: throughput and space efficiency. In real world usage, compression is enabled by default. For throughput, it can be bottled at either compression part or encoding part. As for the space efficiency, , encodings like FPC V1, FPC V2 and Split can also serve for the goal of space efficiency similar to compression. Our evaluation is based on a few artificial and non-artificial data set. For the artificial data set which has low cardinality, it should go directly into dictionary encoding. So we will choose HEPMASS for the data set to reduce the complexity for analysis first. Now let's go through the evaluating data of those encoding one by one:
* Split Benefiting from underlying run length encoding, split can compress the original data to some extends (Compression=NONE, compression ratio=47.28%). If encoding is chose as SPLIT, the compression ratio will not be too much better even using codec like ZLIB (44.36%). If SPLIT is chosen as the underlying encoding, compression will have negative impacts on the throughput with limited space efficiency. In summary, Split has 309MB/s in read and 82MB/s in write with 47.28% compression ratio. Data Set Encoding Compression Read Throughput (MB/s) Write Throughput (MB/s) Compression Ratio HEPMASS SPLIT NONE 309.5525998 82.928411 47.28% HEPMASS SPLIT LZO 326.1146497 62.21142279 47.02% HEPMASS SPLIT ZLIB 223.1909329 32.31915222 44.36% HEPMASS SPLIT SNAPPY 340.4255319 82.71405647 46.71% HEPMASS SPLIT ZSTD 295.2710496 76.87687831 43.15% HEPMASS SPLIT BROTLI 174.1496599 77.06201227 43.12% * FLIP Since FLIP itself doesn't have compression functionality, we need to combine some compression codec to archive the similar compression functionalities as Split. On HEPMASS data set, FLIP has 640MB/s in read and 247MB/s in write with 61.59% compression ratio using LZO. And also it has 266MB/s in READ and 145MB/s in write with 52.39%. In summary, FLIP is a good balance for space efficiency and throughput and user can choose different compression codec to choose different goal (high compression or high throughput). Data Set Encoding Compression Read Throughput (MB/s) Write Throughput (MB/s) Compression Ratio HEPMASS FLIP NONE 775.7575758 587.1559742 100.00% HEPMASS FLIP LZO 640 247.1042517 61.59% HEPMASS FLIP ZLIB 272.0510096 19.21056617 52.95% HEPMASS FLIP SNAPPY 595.3488372 261.4913225 59.49% HEPMASS FLIP ZSTD 266.3891779 145.7858797 52.39% HEPMASS FLIP BROTLI 64.84295846 122.3709392 53.11% * FPC V1 FPC V1 is similar to FPC V2 with little difference in endian mode. We choose FPC V1 in our analysis. FPC_V1 can also serve for the compression (75.76% compression ratio when compression=NONE). Like Split, extended compression codec does not contribute too much higher compression ratio (66.40%-75%) while bottleneck the throughput. In summary, FPC is not compression friendly (66% - 75%) while throughput is close to FLIP and worse than it with compression codec applied. Data Set Encoding Compression Read Throughput (MB/s) Write Throughput (MB/s) Compression Ratio HEPMASS FPC_V1 NONE 469.7247706 324.8731025 75.76% HEPMASS FPC_V1 LZO 474.0740741 310.6796174 75.76% HEPMASS FPC_V1 ZLIB 189.2091648 20.84011761 66.19% HEPMASS FPC_V1 SNAPPY 456.3279857 298.7164583 75.51% HEPMASS FPC_V1 ZSTD 238.1395349 183.7760264 66.35% HEPMASS FPC_V1 BROTLI 53.50052247 165.695796 66.40% * Plain V2 To archive a good balance of compression and throughput, we need to consider ZSTD or ZLIB for the compression codec. Then its throughput will be 200 ~ 600 MB/s in READ and 100 ~ 1000MB/s in write. It's also not good enough as FLIP encoding. Data Set Encoding Compression Read Throughput (MB/s) Write Throughput (MB/s) Compression Ratio HEPMASS PLAIN_V2 NONE 349.2496589 1153.153175 100.00% HEPMASS PLAIN_V2 LZO 571.4285714 236.162366 65.07% HEPMASS PLAIN_V2 ZLIB 304.3995244 10.14544465 54.15% HEPMASS PLAIN_V2 SNAPPY 442.1416235 278.5636613 76.60% HEPMASS PLAIN_V2 ZSTD 242.6540284 144.0630303 56.25% HEPMASS PLAIN_V2 BROTLI 43.99381337 96.67673896 59.33% Other data set, we can observe a similar conclusion as that in HEPMAS data set. As the result, FLIP is a good choice for compression and throughput balance. It's compression friendly unlike Split and FPC. And it brings good throughput than plain V2 with similar compression ratio. So we suggest to use FLIP as the default encoding for double type in ORC. [1] https://github.com/apache/orc/pull/189 Appendix I - Details about our micro-benchmark: Date Set & Compression codec: See Appendix II Data Scale: 1GB Method: Time measured including compression and encoding for write and similar for read path. Appendix II - Benchmark full result Data Set Encoding Compression Read Throughput (MB/s) Write Throughput (MB/s) Compression Ratio LIST_PRICE PLAIN_V2 NONE 641.60401 927.5362492 100.00% LIST_PRICE PLAIN_V2 LZO 513.0260521 267.5026173 47.89% LIST_PRICE PLAIN_V2 ZLIB 318.4079602 12.67515001 37.22% LIST_PRICE PLAIN_V2 SNAPPY 428.8107203 320.4005066 59.19% LIST_PRICE PLAIN_V2 ZSTD 241.9659735 175.1026024 9.82% LIST_PRICE PLAIN_V2 BROTLI 94.39528024 195.5691404 10.68% LIST_PRICE FPC_V1 NONE 538.9473684 343.6241675 57.02% LIST_PRICE FPC_V1 LZO 437.6068376 292.571434 53.83% LIST_PRICE FPC_V1 ZLIB 226.7493357 18.83322333 41.17% LIST_PRICE FPC_V1 SNAPPY 527.8350515 296.6396347 53.70% LIST_PRICE FPC_V1 ZSTD 360.5633803 257.286437 6.33% LIST_PRICE FPC_V1 BROTLI 199.6879875 247.3429998 6.51% LIST_PRICE FPC_V2 NONE 440.6196213 328.6264503 93.41% LIST_PRICE FPC_V2 LZO 330.3225806 158.1223007 64.60% LIST_PRICE FPC_V2 ZLIB 211.745244 12.61332306 46.61% LIST_PRICE FPC_V2 SNAPPY 293.5779817 171.0086872 72.93% LIST_PRICE FPC_V2 ZSTD 171.5817694 118.2994477 19.19% LIST_PRICE FPC_V2 BROTLI 59.631959 94.43010135 24.07% LIST_PRICE FLIP NONE 766.4670659 638.4040019 100.00% LIST_PRICE FLIP LZO 727.2727273 186.1818216 93.93% LIST_PRICE FLIP ZLIB 178.1489214 32.39686216 73.66% LIST_PRICE FLIP SNAPPY 695.6521739 241.5094385 91.63% LIST_PRICE FLIP ZSTD 233.151184 134.5244376 40.08% LIST_PRICE FLIP BROTLI 52.13849287 104.9180347 59.79% LIST_PRICE SPLIT NONE 307.3229292 57.65765873 95.39% LIST_PRICE SPLIT LZO 238.583411 53.34444775 39.24% LIST_PRICE SPLIT ZLIB 189.7702001 10.57326965 30.87% LIST_PRICE SPLIT SNAPPY 214.4053601 54.75935931 48.44% LIST_PRICE SPLIT ZSTD 169.4242224 50.82390406 7.43% LIST_PRICE SPLIT BROTLI 91.62491052 47.95803761 10.12% DISCOUNT_AMT PLAIN_V2 NONE 1080.168776 1286.432185 100.00% DISCOUNT_AMT PLAIN_V2 LZO 782.8746177 504.9309759 18.51% DISCOUNT_AMT PLAIN_V2 ZLIB 527.8350515 46.10120741 13.85% DISCOUNT_AMT PLAIN_V2 SNAPPY 711.1111111 588.5057581 20.41% DISCOUNT_AMT PLAIN_V2 ZSTD 488.5496183 199.8438757 3.50% DISCOUNT_AMT PLAIN_V2 BROTLI 183.6441894 342.7041563 4.29% DISCOUNT_AMT FPC_V1 NONE 625.9168704 335.9580115 21.21% DISCOUNT_AMT FPC_V1 LZO 671.9160105 331.1772377 9.76% DISCOUNT_AMT FPC_V1 ZLIB 487.6190476 84.46057564 8.94% DISCOUNT_AMT FPC_V1 SNAPPY 654.7314578 352.6170865 9.78% DISCOUNT_AMT FPC_V1 ZSTD 561.4035088 331.1772377 1.05% DISCOUNT_AMT FPC_V1 BROTLI 489.4837476 343.6241675 1.21% DISCOUNT_AMT FPC_V2 NONE 641.60401 306.5868321 34.35% DISCOUNT_AMT FPC_V2 LZO 501.9607843 220.4995734 23.46% DISCOUNT_AMT FPC_V2 ZLIB 354.0802213 33.64879137 17.24% DISCOUNT_AMT FPC_V2 SNAPPY 488.5496183 230.8385976 23.48% DISCOUNT_AMT FPC_V2 ZSTD 493.256262 238.8059746 2.57% DISCOUNT_AMT FPC_V2 BROTLI 289.5927602 229.5964168 3.00% DISCOUNT_AMT FLIP NONE 775.7575758 713.0919353 100.00% DISCOUNT_AMT FLIP LZO 439.862543 246.3907649 35.60% DISCOUNT_AMT FLIP ZLIB 296.2962963 15.07478535 24.79% DISCOUNT_AMT FLIP SNAPPY 415.5844156 282.2491784 41.03% DISCOUNT_AMT FLIP ZSTD 201.7336485 184.4380438 9.05% DISCOUNT_AMT FLIP BROTLI 98.23484267 153.3852635 14.78% DISCOUNT_AMT SPLIT NONE 243.1149098 125.860376 42.25% DISCOUNT_AMT SPLIT LZO 250.2443793 112.2807038 1.41% DISCOUNT_AMT SPLIT ZLIB 208.2994304 29.54073445 11.14% DISCOUNT_AMT SPLIT SNAPPY 237.2567192 116.1524523 12.13% DISCOUNT_AMT SPLIT ZSTD 222.4152911 116.0471463 1.02% DISCOUNT_AMT SPLIT BROTLI 172.2745626 107.3825523 1.10% IOT_METER PLAIN_V2 NONE 833.8762215 1024.000019 100.00% IOT_METER PLAIN_V2 LZO 653.0612245 429.5302093 22.77% IOT_METER PLAIN_V2 ZLIB 605.2009456 38.18046305 10.73% IOT_METER PLAIN_V2 SNAPPY 675.4617414 506.9307025 23.20% IOT_METER PLAIN_V2 ZSTD 358.5434174 235.9447049 4.12% IOT_METER PLAIN_V2 BROTLI 161.6161616 227.3534678 6.08% IOT_METER FPC_V1 NONE 563.876652 379.8219655 32.06% IOT_METER FPC_V1 LZO 507.9365079 290.9090963 13.63% IOT_METER FPC_V1 ZLIB 360.5633803 27.16756922 13.35% IOT_METER FPC_V1 SNAPPY 453.0973451 273.5042786 16.99% IOT_METER FPC_V1 ZSTD 388.4673748 263.1038076 1.68% IOT_METER FPC_V1 BROTLI 355.0624133 279.781426 1.78% IOT_METER FPC_V2 NONE 514.0562249 314.8831547 60.06% IOT_METER FPC_V2 LZO 420.3612479 203.6595106 24.12% IOT_METER FPC_V2 ZLIB 339.0728477 28.20315135 16.98% IOT_METER FPC_V2 SNAPPY 425.9567388 225.7495633 25.88% IOT_METER FPC_V2 ZSTD 280.7017544 176.7955834 3.92% IOT_METER FPC_V2 BROTLI 225.7495591 190.7600632 4.24% IOT_METER FLIP NONE 636.8159204 580.498877 100.00% IOT_METER FLIP LZO 325.2858958 223.7762279 66.07% IOT_METER FLIP ZLIB 251.9685039 30.47619104 42.93% IOT_METER FLIP SNAPPY 480.3001876 247.3429998 67.40% IOT_METER FLIP ZSTD 214.2259414 148.1481509 21.73% IOT_METER FLIP BROTLI 72.4801812 126.9841293 25.84% IOT_METER SPLIT NONE 256.5130261 68.26666794 84.95% IOT_METER SPLIT LZO 227.3534636 63.6499266 18.64% IOT_METER SPLIT ZLIB 213.3333333 26.7223387 9.66% IOT_METER SPLIT SNAPPY 230.2158273 62.21142279 20.08% IOT_METER SPLIT ZSTD 184.1726619 58.79651005 2.91% IOT_METER SPLIT BROTLI 125.061065 61.03958149 3.41% NYC_TAXI_DROP_LAT PLAIN_V2 NONE 980.8429119 1122.807038 100.00% NYC_TAXI_DROP_LAT PLAIN_V2 LZO 573.9910314 262.8336805 46.76% NYC_TAXI_DROP_LAT PLAIN_V2 ZLIB 324.0506329 14.90885824 34.20% NYC_TAXI_DROP_LAT PLAIN_V2 SNAPPY 448.3362522 310.3030361 56.42% NYC_TAXI_DROP_LAT PLAIN_V2 ZSTD 236.1623616 141.0468346 34.99% NYC_TAXI_DROP_LAT PLAIN_V2 BROTLI 51.13863364 109.7770175 39.10% NYC_TAXI_DROP_LAT FPC_V1 NONE 445.2173913 169.536427 75.73% NYC_TAXI_DROP_LAT FPC_V1 LZO 418.3006536 250.0000047 75.73% NYC_TAXI_DROP_LAT FPC_V1 ZLIB 189.0694239 13.17075705 51.13% NYC_TAXI_DROP_LAT FPC_V1 SNAPPY 300.1172333 167.6489881 70.49% NYC_TAXI_DROP_LAT FPC_V1 ZSTD 253.968254 188.2352976 53.59% NYC_TAXI_DROP_LAT FPC_V1 BROTLI 58.64833906 167.7588498 54.37% NYC_TAXI_DROP_LAT FPC_V2 NONE 556.5217391 354.0802279 79.94% NYC_TAXI_DROP_LAT FPC_V2 LZO 338.6243386 164.6302281 52.82% NYC_TAXI_DROP_LAT FPC_V2 ZLIB 223.580786 8.611120615 38.58% NYC_TAXI_DROP_LAT FPC_V2 SNAPPY 306.9544365 187.683288 61.75% NYC_TAXI_DROP_LAT FPC_V2 ZSTD 243.3460076 122.6053663 38.80% NYC_TAXI_DROP_LAT FPC_V2 BROTLI 54.66581251 97.37542973 41.73% NYC_TAXI_DROP_LAT FLIP NONE 917.562724 677.2486899 100.00% NYC_TAXI_DROP_LAT FLIP LZO 697.5476839 305.854247 45.04% NYC_TAXI_DROP_LAT FLIP ZLIB 304.0380048 23.90512697 33.75% NYC_TAXI_DROP_LAT FLIP SNAPPY 608.0760095 313.725496 43.76% NYC_TAXI_DROP_LAT FLIP ZSTD 294.2528736 177.4081807 33.23% NYC_TAXI_DROP_LAT FLIP BROTLI 89.01251739 153.7537566 34.35% NYC_TAXI_DROP_LAT SPLIT NONE 391.4373089 131.2147641 38.89% NYC_TAXI_DROP_LAT SPLIT LZO 375.3665689 133.2639275 37.96% NYC_TAXI_DROP_LAT SPLIT ZLIB 235.0780533 32.05208523 29.98% NYC_TAXI_DROP_LAT SPLIT SNAPPY 373.7226277 122.1374069 37.96% NYC_TAXI_DROP_LAT SPLIT ZSTD 280.0875274 115.784715 30.04% NYC_TAXI_DROP_LAT SPLIT BROTLI 99.26328034 112.6760584 30.06% NYC_TAXI_DROP_LONG PLAIN_V2 NONE 1024 1319.587653 100.00% NYC_TAXI_DROP_LONG PLAIN_V2 LZO 536.687631 264.1898914 44.78% NYC_TAXI_DROP_LONG PLAIN_V2 ZLIB 339.9734396 17.12718303 31.48% NYC_TAXI_DROP_LONG PLAIN_V2 SNAPPY 457.960644 315.6596853 52.53% NYC_TAXI_DROP_LONG PLAIN_V2 ZSTD 248.7852284 146.2021729 32.49% NYC_TAXI_DROP_LONG PLAIN_V2 BROTLI 58.62147928 115.9945649 35.83% NYC_TAXI_DROP_LONG FPC_V1 NONE 428.0936455 270.0421991 75.73% NYC_TAXI_DROP_LONG FPC_V1 LZO 383.808096 209.6642136 75.39% NYC_TAXI_DROP_LONG FPC_V1 ZLIB 191.0447761 13.72948647 49.16% NYC_TAXI_DROP_LONG FPC_V1 SNAPPY 276.7567568 162.6429509 69.89% NYC_TAXI_DROP_LONG FPC_V1 ZSTD 213.6894825 177.65441 51.44% NYC_TAXI_DROP_LONG FPC_V1 BROTLI 57.78781038 151.2108711 52.48% NYC_TAXI_DROP_LONG FPC_V2 NONE 514.0562249 115.4192988 77.99% NYC_TAXI_DROP_LONG FPC_V2 LZO 329.8969072 158.9075138 50.99% NYC_TAXI_DROP_LONG FPC_V2 ZLIB 211.9205298 8.547008706 37.01% NYC_TAXI_DROP_LONG FPC_V2 SNAPPY 296.2962963 180.1548239 59.17% NYC_TAXI_DROP_LONG FPC_V2 ZSTD 242.4242424 124.5742116 37.32% NYC_TAXI_DROP_LONG FPC_V2 BROTLI 57.72266065 97.85932904 40.10% NYC_TAXI_DROP_LONG FLIP NONE 930.9090909 668.4073232 100.00% NYC_TAXI_DROP_LONG FLIP LZO 673.6842105 303.3175412 42.93% NYC_TAXI_DROP_LONG FLIP ZLIB 330.749354 23.51428353 31.84% NYC_TAXI_DROP_LONG FLIP SNAPPY 576.5765766 308.0625809 42.19% NYC_TAXI_DROP_LONG FLIP ZSTD 306.9544365 165.3746801 32.09% NYC_TAXI_DROP_LONG FLIP BROTLI 86.98606864 158.4158445 32.77% NYC_TAXI_DROP_LONG SPLIT NONE 411.5755627 128.9672568 39.43% NYC_TAXI_DROP_LONG SPLIT LZO 390.2439024 127.5535649 38.00% NYC_TAXI_DROP_LONG SPLIT ZLIB 245.681382 25.81165606 28.33% NYC_TAXI_DROP_LONG SPLIT SNAPPY 362.6062323 112.8250352 37.70% NYC_TAXI_DROP_LONG SPLIT ZSTD 298.0209546 112.2314795 28.31% NYC_TAXI_DROP_LONG SPLIT BROTLI 105.2631579 110.3448296 28.36% HIGGS PLAIN_V2 NONE 1015.873016 1312.820537 100.00% HIGGS PLAIN_V2 LZO 517.1717172 211.9205337 57.54% HIGGS PLAIN_V2 ZLIB 285.077951 15.71709263 45.34% HIGGS PLAIN_V2 SNAPPY 456.3279857 295.2710551 62.93% HIGGS PLAIN_V2 ZSTD 245.9173871 134.5951655 32.67% HIGGS PLAIN_V2 BROTLI 70.581748 117.9180123 36.06% HIGGS FPC_V1 NONE 442.9065744 320.802011 75.74% HIGGS FPC_V1 LZO 396.8992248 308.8057959 75.75% HIGGS FPC_V1 ZLIB 184.3052556 20.93898289 66.06% HIGGS FPC_V1 SNAPPY 416.9381107 292.9061839 75.50% HIGGS FPC_V1 ZSTD 219.1780822 178.2729838 66.19% HIGGS FPC_V1 BROTLI 53.10101639 159.4022446 66.24% HIGGS FPC_V2 NONE 400 299.7658135 97.31% HIGGS FPC_V2 LZO 277.9587405 140.3508798 74.91% HIGGS FPC_V2 ZLIB 99.30178433 8.00050018 60.80% HIGGS FPC_V2 SNAPPY 252.7147088 147.3805439 82.49% HIGGS FPC_V2 ZSTD 207.6236821 112.1822983 59.45% HIGGS FPC_V2 BROTLI 42.82368685 82.63395893 62.70% HIGGS FLIP NONE 917.562724 661.4987203 100.00% HIGGS FLIP LZO 705.2341598 255.2343019 60.98% HIGGS FLIP ZLIB 274.9731472 19.60333906 51.98% HIGGS FLIP SNAPPY 630.5418719 276.1596599 58.84% HIGGS FLIP ZSTD 216.0337553 150.4997089 51.35% HIGGS FLIP BROTLI 68.04891015 124.3322024 52.23% HIGGS SPLIT NONE 334.2036554 82.66064087 47.40% HIGGS SPLIT LZO 325.6997455 79.28151278 46.83% HIGGS SPLIT ZLIB 202.5316456 28.92655421 41.78% HIGGS SPLIT SNAPPY 309.9273608 78.76923224 46.49% HIGGS SPLIT ZSTD 300.8225617 74.54863272 42.79% HIGGS SPLIT BROTLI 100.6685018 72.45966736 42.61% HEPMASS PLAIN_V2 NONE 349.2496589 1153.153175 100.00% HEPMASS PLAIN_V2 LZO 571.4285714 236.162366 65.07% HEPMASS PLAIN_V2 ZLIB 304.3995244 10.14544465 54.15% HEPMASS PLAIN_V2 SNAPPY 442.1416235 278.5636613 76.60% HEPMASS PLAIN_V2 ZSTD 242.6540284 144.0630303 56.25% HEPMASS PLAIN_V2 BROTLI 43.99381337 96.67673896 59.33% HEPMASS FPC_V1 NONE 469.7247706 324.8731025 75.76% HEPMASS FPC_V1 LZO 474.0740741 310.6796174 75.76% HEPMASS FPC_V1 ZLIB 189.2091648 20.84011761 66.19% HEPMASS FPC_V1 SNAPPY 456.3279857 298.7164583 75.51% HEPMASS FPC_V1 ZSTD 238.1395349 183.7760264 66.35% HEPMASS FPC_V1 BROTLI 53.50052247 165.695796 66.40% HEPMASS FPC_V2 NONE 439.862543 294.252879 97.84% HEPMASS FPC_V2 LZO 277.9587405 138.5281411 76.20% HEPMASS FPC_V2 ZLIB 171.6968478 8.017538515 61.68% HEPMASS FPC_V2 SNAPPY 253.4653465 144.1441468 83.12% HEPMASS FPC_V2 ZSTD 197.5308642 116.5225329 60.38% HEPMASS FPC_V2 BROTLI 40.77731762 78.19181575 63.65% HEPMASS FLIP NONE 775.7575758 587.1559742 100.00% HEPMASS FLIP LZO 640 247.1042517 61.59% HEPMASS FLIP ZLIB 272.0510096 19.21056617 52.95% HEPMASS FLIP SNAPPY 595.3488372 261.4913225 59.49% HEPMASS FLIP ZSTD 266.3891779 145.7858797 52.39% HEPMASS FLIP BROTLI 64.84295846 122.3709392 53.11% HEPMASS SPLIT NONE 309.5525998 82.928411 47.28% HEPMASS SPLIT LZO 326.1146497 62.21142279 47.02% HEPMASS SPLIT ZLIB 223.1909329 32.31915222 44.36% HEPMASS SPLIT SNAPPY 340.4255319 82.71405647 46.71% HEPMASS SPLIT ZSTD 295.2710496 76.87687831 43.15% HEPMASS SPLIT BROTLI 174.1496599 77.06201227 43.12% PHONE PLAIN_V2 NONE 1333.333333 1471.264395 100.00% PHONE PLAIN_V2 LZO 536.687631 280.7017596 49.24% PHONE PLAIN_V2 ZLIB 369.4083694 44.32900515 30.68% PHONE PLAIN_V2 SNAPPY 613.9088729 366.2374889 48.37% PHONE PLAIN_V2 ZSTD 283.8137472 166.7752474 26.98% PHONE PLAIN_V2 BROTLI 77.1549126 156.76669 31.42% PHONE FPC_V1 NONE 449.9121265 314.8831547 102.56% PHONE FPC_V1 LZO 361.0719323 223.3856935 92.48% PHONE FPC_V1 ZLIB 157.8298397 18.87627229 77.92% PHONE FPC_V1 SNAPPY 378.1388479 222.6086998 91.26% PHONE FPC_V1 ZSTD 199.5323461 127.2998532 74.16% PHONE FPC_V1 BROTLI 43.82811162 105.610563 76.80% PHONE FPC_V2 NONE 440.6196213 318.0124283 84.75% PHONE FPC_V2 LZO 426.6666667 176.6735713 78.76% PHONE FPC_V2 ZLIB 193.9393939 33.35939598 70.06% PHONE FPC_V2 SNAPPY 414.2394822 237.91822 77.82% PHONE FPC_V2 ZSTD 231.6742081 150.3229623 68.29% PHONE FPC_V2 BROTLI 54.65414176 135.3065564 71.26% PHONE FLIP NONE 920.8633094 659.7938267 100.00% PHONE FLIP LZO 690.0269542 213.5112634 90.96% PHONE FLIP ZLIB 211.0469909 28.5491251 81.50% PHONE FLIP SNAPPY 618.3574879 239.9250279 89.70% PHONE FLIP ZSTD 268.0628272 130.879348 82.24% PHONE FLIP BROTLI 50.06845296 110.2497867 84.18% PHONE SPLIT NONE 384.3843844 72.87219037 89.04% PHONE SPLIT LZO 272.0510096 61.17084941 45.21% PHONE SPLIT ZLIB 213.6894825 26.77264221 29.37% PHONE SPLIT SNAPPY 276.4578834 64.32160924 45.31% PHONE SPLIT ZSTD 186.8613139 52.54515697 30.37% PHONE SPLIT BROTLI 65.64102564 50.39370173 30.75% Best Regards Ferdinand Xu
