2024/08/20-14:13:50.629477 140500372350528 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00: fork to child time = 0.014977 sec 2024/08/20-14:13:50.630436 140500372350528 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00 2024/08/20-14:13:50.635268 140500372350528 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00 2024/08/20-14:13:50.637231 140500372350528 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-14:13:50.637566 140500372350528 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-14:13:50.676222 140500372350528 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-33730/att-00/MANIFEST-14629260 2024/08/20-14:13:50.690902 140500372350528 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-33730/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14668167, last_sequence is 190644551448, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14668156 2024/08/20-14:13:50.690911 140500372350528 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-14:13:50.691019 140500372350528 [version_set.cc:5652] Creating manifest 14668167 2024/08/20-14:13:50.714603 140500372350528 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-14:13:50.728124 140500372350528 [compaction_job.cc:2433] [default] [JOB 33730] Compacting 1@2 + 2@3 files to L3, score 1.00, subcompactions 1 : 1 2024/08/20-14:13:50.728142 140500372350528 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 17244 Base level 2, inputs: [14668131(20MB)], [14668098(97MB) 14668099(60MB)] 2024/08/20-14:13:50.948263 140500372350528 [top_zip_table.cc:59] core git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-14:13:50.948292 140500372350528 [top_zip_table.cc:60] fsa git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-14:13:50.948317 140500372350528 [top_zip_table.cc:61] zbs git_version_hash_info_is:commit 7517bad5c1a147474c3830831b9a22c996321ae8 Author: leipeng Date: 2024-01-08 19:18:17 +0800 vfork_cmd: call close before wait_finish g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. INCS = -Isrc -I3rdparty/re2 -I3rdparty/zstd -Iboost-include CXXFLAGS = -D TOPLING_IO_WITH_URING=1 -fPIC -time -Wno-class-memaccess -fdiagnostics-color -Wformat=2 -Wcomment -Wall -Wextra -Wno-unused-parameter -Wno-alloc-size-larger-than -mcx16 -Wno-deprecated-declarations -Wstrict-aliasing=3 -DCLIENT_LICENSE_ID="public" -DNO_THREADS -ftls-model=initial-exec -DDIVSUFSORT_API= -fno-stack-protector RLS_FLAGS = -O3 -DNDEBUG -g3 WITH_BMI2 = 1 compile_cpu_flag: -march=haswell -mbmi -mbmi2 2024/08/20-14:13:50.948334 140500372350528 [top_zip_table.cc:62] topling-zip_table_reader: git_version_hash_info_is: commit 7f80399bfbd2071b6e0f5683e8ab7225b8e6e394 Author: leipeng Date: 2024-01-19 14:52:30 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-14:13:50.948349 140500372350528 [top_zip_table.cc:64] topling-rocks git_version_hash_info_is: commit 1240987ca13d0fe562c9b9c037155079f0877840 Author: leipeng Date: 2024-01-19 15:07:04 +0800 Change ToplingZipTableOptions::sampleRatio to vector g++ (GCC) 12.1.0 Copyright (C) 2022 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. cpu_flag: -march=native -mbmi -mbmi2 2024/08/20-14:13:51.848484 140500372350528 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst) /dev/shm/ToplingTemp/Topling-380518-bNsB0b 2024/08/20-14:13:52.500193 140500372350528 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst): first pass time = 0.65's, 205.968'MB/sec 2024/08/20-14:13:56.451502 140500372350528 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst): old prealloc_size = 147639500, real_size = 100215840 2024/08/20-14:13:56.451716 140500372350528 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197666 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.91 raw-val = 0.1295 GB zip-val = 0.0998 GB avg-val = 655.02 avg-zval = 504.83 2024/08/20-14:13:56.451999 140500372350528 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-14:13:57.085030 140500372350528 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668168.sst): second pass time = 3.94's, 32.855'MB/sec, value only(96.5% of KV) wait indexing time = 0.01's, remap KeyValue time = 0.63's, 161.423'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2032.205'MB/sec (index lex order gen) rebuild zvType time = 0.52's, 0.094'MB/sec write SST data time = 0.11's, 933.163'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.357'MB, throughput = 31770.564'MB/sec zip my value time = 3.94's, unzip length = 0.129'GB zip my value throughput = 32.855'MB/sec zip pipeline throughput = 118.304'MB/sec entries = 197666 avg-key = 24.00 avg-zkey = 1.91 avg-val = 655.02 avg-zval = 504.83 usrkeys = 197666 avg-key = 16.00 avg-zkey = 1.91 avg-val = 662.02 avg-zval = 504.83 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197666 bytes = 741264 } seq expand size = 1383662 multi value expand size = 0 cnt WriteAppend = 14 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.36 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0998 GB dict = 1.36 MB all = 0.1023 GB } UnZip/Zip{ index = 8.3700 value = 1.2975 dict = 1.00 all = 1.3124 } Zip/UnZip{ index = 0.1195 value = 0.7707 dict = 1.00 all = 0.7619 } ---------------------------- total value len = 62.427608 GB avg = 0.180 KB (by entry num) total key len = 6.793502 GB avg = 0.020 KB total ukey len = 3.192670 GB avg = 0.008 KB total ukey num = 0.389531227 Billion total entry num = 0.346409235 Billion write speed all = 0.930442749 MB/sec (with seq num) write speed all = 0.893192383 MB/sec (without seq num) 2024/08/20-14:13:57.218451 140500372350528 [compaction_job.cc:1944] [default] [JOB 33730] Generated table #14668168: 197666 keys, 102267361 bytes, temperature: kWarm 2024/08/20-14:13:57.218568 140500372350528 EVENT_LOG_v1 {"time_micros": 1724134437218505, "cf_name": "default", "job": 33730, "event": "table_file_creation", "file_number": 14668168, "file_size": 102267361, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190642683491, "table_properties": {"data_size": 99788368, "index_size": 377856, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 4743984, "raw_average_key_size": 24, "raw_value_size": 129474411, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 197666, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724134431, "oldest_key_time": 0, "file_creation_time": 1724134431, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14668168, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-14:13:57.300591 140500372350528 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst) /dev/shm/ToplingTemp/Topling-380518-V7fzEb 2024/08/20-14:13:58.037366 140500372350528 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst): first pass time = 0.74's, 116.488'MB/sec 2024/08/20-14:13:59.573388 140500372350528 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst): old prealloc_size = 147639500, real_size = 64310112 2024/08/20-14:13:59.573566 140500372350528 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 126396 prefix = 4 raw-key = 0.0015 GB zip-key = 0.0002 GB avg-key = 12.00 avg-zkey = 1.89 raw-val = 0.0828 GB zip-val = 0.0640 GB avg-val = 654.98 avg-zval = 506.66 2024/08/20-14:13:59.573729 140500372350528 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0003 GB, waited 0.000 sec, Key+Value = 0.086 GB 2024/08/20-14:13:59.815577 140500372350528 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00/14668169.sst): second pass time = 1.53's, 53.949'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.24's, 270.762'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1605.128'MB/sec (index lex order gen) rebuild zvType time = 0.19's, 0.164'MB/sec write SST data time = 0.05's, 1328.363'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.868'MB, throughput = 21662.151'MB/sec zip my value time = 1.53's, unzip length = 0.083'GB zip my value throughput = 53.949'MB/sec zip pipeline throughput = 113.008'MB/sec entries = 126396 avg-key = 24.00 avg-zkey = 1.89 avg-val = 654.98 avg-zval = 506.66 usrkeys = 126396 avg-key = 16.00 avg-zkey = 1.89 avg-val = 661.98 avg-zval = 506.66 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 126396 bytes = 426608 } seq expand size = 884772 multi value expand size = 0 cnt WriteAppend = 11 UnZipSize{ index = 0.0020 GB value = 0.0828 GB dict = 0.87 MB all = 0.0858 GB } __ZipSize{ index = 0.0002 GB value = 0.0640 GB dict = 0.87 MB all = 0.0656 GB } UnZip/Zip{ index = 8.4830 value = 1.2927 dict = 1.00 all = 1.3087 } Zip/UnZip{ index = 0.1179 value = 0.7735 dict = 1.00 all = 0.7641 } ---------------------------- total value len = 62.511280 GB avg = 0.180 KB (by entry num) total key len = 6.796535 GB avg = 0.020 KB total ukey len = 3.194692 GB avg = 0.008 KB total ukey num = 0.389657623 Billion total entry num = 0.346535631 Billion write speed all = 0.931574022 MB/sec (with seq num) write speed all = 0.894311431 MB/sec (without seq num) 2024/08/20-14:13:59.892141 140500372350528 [compaction_job.cc:1944] [default] [JOB 33730] Generated table #14668169: 126396 keys, 65575684 bytes, temperature: kWarm 2024/08/20-14:13:59.892208 140500372350528 EVENT_LOG_v1 {"time_micros": 1724134439892176, "cf_name": "default", "job": 33730, "event": "table_file_creation", "file_number": 14668169, "file_size": 65575684, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190544015405, "largest_seqno": 190642683637, "table_properties": {"data_size": 64039952, "index_size": 238400, "index_partitions": 0, "top_level_index_size": 0, "index_key_is_user_key": 0, "index_value_is_delta_encoded": 0, "filter_size": 0, "raw_key_size": 3033504, "raw_average_key_size": 24, "raw_value_size": 82787466, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 126396, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 24, "fixed_value_len": 18446744073709551615, "filter_policy": "", "column_family_name": "default", "column_family_id": 0, "comparator": "leveldb.BytewiseComparator", "merge_operator": "nullptr", "prefix_extractor_name": "nullptr", "property_collectors": "[Rdb_tbl_prop_coll_factory]", "compression": "FlatZip", "compression_options": "RS_Key0_Tag1-NestLoudsTrieDAWG_Mixed_XL_256_32_FL-DictZipBlobStore", "creation_time": 1724134437, "oldest_key_time": 0, "file_creation_time": 1724134437, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "90ZT1ZM5QNL093I8HHQG", "orig_file_number": 14668169, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-14:13:59.915521 140500372350528 [compaction_job.cc:699] job-33730: subcompact[0], size: 0.167843 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-33730/att-00 [14668168,14668169] 2024/08/20-14:13:59.946090 140500372350528 (Original Log Time 2024/08/20-14:13:50.728211) EVENT_LOG_v1 {"time_micros": 1724134430728159, "job": 33730, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14668131], "files_L3": [14668098, 14668099], "score": 0.999513, "input_data_size": 187128684, "oldest_snapshot_seqno": 190644551176} 2024/08/20-14:13:59.946093 140500372350528 (Original Log Time 2024/08/20-14:13:59.945671) [compaction_job.cc:2018] [default] [JOB 33730] Compacted 1@2 + 2@3 files to L3 => 167843045 bytes 2024/08/20-14:13:59.946095 140500372350528 (Original Log Time 2024/08/20-14:13:59.946022) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 20.4 rd, 18.3 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(20.2, 158.2 +0.0 blob) out(160.1 +0.0 blob), read-write-amplify(16.7) write-amplify(7.9) OK, records in: 351233, records dropped: 27171 output_compression: Snappy 2024/08/20-14:13:59.946102 140500372350528 (Original Log Time 2024/08/20-14:13:59.946067) EVENT_LOG_v1 {"time_micros": 1724134439946049, "cf": "default", "job": 33730, "event": "compaction_finished", "compaction_time_micros": 9187322, "compaction_time_cpu_micros": 1323924, "output_level": 3, "num_output_files": 2, "total_output_size": 167843045, "num_input_records": 351233, "num_output_records": 324062, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 203162947, "file_range_sync_nanos": 0, "file_fsync_nanos": 1502, "file_prepare_write_nanos": 5816, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-14:14:00.070407 140500372350528 DEBG dcompact_worker.cpp:240: HttpPost: 200 OK: url = http://nlb-7zny4kaa1poal01o64.cn-shenzhen.nlb.aliyuncs.com:8443, body = {"instanceId":"nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137","labourId":"","dbId":"a007a635-5c0a-4b4a-be96-b9c695cb016b","dbStarts":1724092920,"starts":1724134430,"executesMs":9309,"compactionJobId":33730,"attempt":0,"compactionInputRawBytes":238486180,"compactionInputZipBytes":187128684,"compactionOutputRawBytes":0,"compactionOutputZipBytes":167843045,"headers":{"Accept":"*/*","Connection":"close","Host":"aliyun-topling-saas.topling.cn:18443","RemoteIp":"120.24.192.169","X-Forwarded-For":"120.24.192.169","region":"cn-shenzhen","token":"e6474c481bd4415abc537135cc03626b","instance-token":"e6474c481bd4415abc537135cc03626b","provider":"aliyun","CloudMarketInstanceId":"si-59c0ae5c955845588903","MeteringAssit":"","Transfer-Encoding":"chunked","traceparent":"00-b65efbb60c265b608c66141fad7ea577-fa7b0134a890b9ad-00"}}, response = 2024/08/20-14:14:00.070521 140500372350528 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-33730/att-00: olev 3, work 9.310 s, result 6.088 ms, install 0.456 ms, input{raw 227.438 MiB zip 178.460 MiB}