2024/08/20-12:39:31.597014 140500565382720 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00: fork to child time = 0.014060 sec 2024/08/20-12:39:31.598347 140500565382720 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00 2024/08/20-12:39:31.604190 140500565382720 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00 2024/08/20-12:39:31.604691 140500565382720 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-12:39:31.605089 140500565382720 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-12:39:31.652272 140500565382720 [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-30031/att-00/MANIFEST-14629260 2024/08/20-12:39:31.685367 140500565382720 [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-30031/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14663699, last_sequence is 190544098818, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14663540 2024/08/20-12:39:31.685375 140500565382720 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-12:39:31.685455 140500565382720 [version_set.cc:5652] Creating manifest 14663699 2024/08/20-12:39:31.711320 140500565382720 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-12:39:31.726147 140500565382720 [compaction_job.cc:2433] [default] [JOB 30031] Compacting 1@2 + 2@3 files to L3, score 0.96, subcompactions 1 : 1 2024/08/20-12:39:31.726163 140500565382720 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 15345 Base level 2, inputs: [14663672(19MB)], [14663633(97MB) 14663634(71MB)] 2024/08/20-12:39:31.905358 140500565382720 [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 2024/08/20-12:39:31.905384 140500565382720 [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 2024/08/20-12:39:31.905408 140500565382720 [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 2024/08/20-12:39:31.905424 140500565382720 [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 2024/08/20-12:39:31.905439 140500565382720 [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 2024/08/20-12:39:32.649872 140500565382720 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst) /dev/shm/ToplingTemp/Topling-350869-yoGHEh 2024/08/20-12:39:33.106524 140500565382720 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst): first pass time = 0.46's, 293.965'MB/sec 2024/08/20-12:39:37.182120 140500565382720 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst): old prealloc_size = 147639500, real_size = 100330880 2024/08/20-12:39:37.182324 140500565382720 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197704 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.89 raw-val = 0.1295 GB zip-val = 0.0999 GB avg-val = 654.89 avg-zval = 505.34 2024/08/20-12:39:37.182695 140500565382720 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-12:39:37.664913 140500565382720 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663700.sst): second pass time = 4.07's, 31.794'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.48's, 212.054'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2114.158'MB/sec (index lex order gen) rebuild zvType time = 0.34's, 0.147'MB/sec write SST data time = 0.15's, 698.847'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.351'MB, throughput = 33159.218'MB/sec zip my value time = 4.07's, unzip length = 0.129'GB zip my value throughput = 31.794'MB/sec zip pipeline throughput = 137.914'MB/sec entries = 197704 avg-key = 24.00 avg-zkey = 1.89 avg-val = 654.89 avg-zval = 505.34 usrkeys = 197704 avg-key = 16.00 avg-zkey = 1.89 avg-val = 661.89 avg-zval = 505.34 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197704 bytes = 741408 } seq expand size = 1383928 multi value expand size = 0 cnt WriteAppend = 14 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.35 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0999 GB dict = 1.35 MB all = 0.1024 GB } UnZip/Zip{ index = 8.4692 value = 1.2959 dict = 1.00 all = 1.3110 } Zip/UnZip{ index = 0.1181 value = 0.7716 dict = 1.00 all = 0.7628 } ---------------------------- total value len = 62.427607 GB avg = 0.180 KB (by entry num) total key len = 6.793503 GB avg = 0.020 KB total ukey len = 3.192671 GB avg = 0.008 KB total ukey num = 0.389531265 Billion total entry num = 0.346409273 Billion write speed all = 1.007050803 MB/sec (with seq num) write speed all = 0.966733422 MB/sec (without seq num) 2024/08/20-12:39:37.806160 140500565382720 [compaction_job.cc:1944] [default] [JOB 30031] Generated table #14663700: 197704 keys, 102376678 bytes, temperature: kWarm 2024/08/20-12:39:37.806331 140500565382720 EVENT_LOG_v1 {"time_micros": 1724128777806202, "cf_name": "default", "job": 30031, "event": "table_file_creation", "file_number": 14663700, "file_size": 102376678, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190544013638, "table_properties": {"data_size": 99907760, "index_size": 373504, "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": 4744896, "raw_average_key_size": 24, "raw_value_size": 129473440, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197704, "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": 1724128772, "oldest_key_time": 0, "file_creation_time": 1724128772, "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": 14663700, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-12:39:37.856206 140500565382720 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst) /dev/shm/ToplingTemp/Topling-350869-G3sZ6h 2024/08/20-12:39:38.742451 140500565382720 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst): first pass time = 0.89's, 113.113'MB/sec 2024/08/20-12:39:40.296125 140500565382720 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst): old prealloc_size = 147639500, real_size = 74919440 2024/08/20-12:39:40.296270 140500565382720 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 147657 prefix = 4 raw-key = 0.0018 GB zip-key = 0.0003 GB avg-key = 12.00 avg-zkey = 1.88 raw-val = 0.0967 GB zip-val = 0.0746 GB avg-val = 654.88 avg-zval = 505.25 2024/08/20-12:39:40.296436 140500565382720 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0003 GB, waited 0.000 sec, Key+Value = 0.100 GB 2024/08/20-12:39:40.527504 140500565382720 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00/14663701.sst): second pass time = 1.55's, 62.272'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.23's, 330.340'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2274.911'MB/sec (index lex order gen) rebuild zvType time = 0.16's, 0.229'MB/sec write SST data time = 0.07's, 1087.729'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.018'MB, throughput = 27560.873'MB/sec zip my value time = 1.55's, unzip length = 0.097'GB zip my value throughput = 62.272'MB/sec zip pipeline throughput = 84.723'MB/sec entries = 147657 avg-key = 24.00 avg-zkey = 1.88 avg-val = 654.88 avg-zval = 505.25 usrkeys = 147657 avg-key = 16.00 avg-zkey = 1.88 avg-val = 661.88 avg-zval = 505.25 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 147657 bytes = 516816 } seq expand size = 1033599 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0024 GB value = 0.0967 GB dict = 1.02 MB all = 0.1002 GB } __ZipSize{ index = 0.0003 GB value = 0.0746 GB dict = 1.02 MB all = 0.0764 GB } UnZip/Zip{ index = 8.4919 value = 1.2962 dict = 1.00 all = 1.3117 } Zip/UnZip{ index = 0.1178 value = 0.7715 dict = 1.00 all = 0.7624 } ---------------------------- total value len = 62.525339 GB avg = 0.180 KB (by entry num) total key len = 6.797046 GB avg = 0.020 KB total ukey len = 3.195033 GB avg = 0.008 KB total ukey num = 0.389678922 Billion total entry num = 0.346556930 Billion write speed all = 1.008482194 MB/sec (with seq num) write speed all = 0.968149307 MB/sec (without seq num) 2024/08/20-12:39:40.621120 140500565382720 [compaction_job.cc:1944] [default] [JOB 30031] Generated table #14663701: 147657 keys, 76420128 bytes, temperature: kWarm 2024/08/20-12:39:40.621208 140500565382720 EVENT_LOG_v1 {"time_micros": 1724128780621164, "cf_name": "default", "job": 30031, "event": "table_file_creation", "file_number": 14663701, "file_size": 76420128, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190397584698, "largest_seqno": 190544012723, "table_properties": {"data_size": 74604160, "index_size": 278208, "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": 3543768, "raw_average_key_size": 24, "raw_value_size": 96698246, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 147657, "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": 1724128777, "oldest_key_time": 0, "file_creation_time": 1724128777, "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": 14663701, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-12:39:40.668384 140500565382720 [compaction_job.cc:699] job-30031: subcompact[0], size: 0.178797 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-30031/att-00 [14663700,14663701] 2024/08/20-12:39:40.746446 140500565382720 (Original Log Time 2024/08/20-12:39:31.726240) EVENT_LOG_v1 {"time_micros": 1724128771726178, "job": 30031, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14663672], "files_L3": [14663633, 14663634], "score": 0.964307, "input_data_size": 197676691, "oldest_snapshot_seqno": 190544098129} 2024/08/20-12:39:40.746451 140500565382720 (Original Log Time 2024/08/20-12:39:40.743168) [compaction_job.cc:2018] [default] [JOB 30031] Compacted 1@2 + 2@3 files to L3 => 178796806 bytes 2024/08/20-12:39:40.746454 140500565382720 (Original Log Time 2024/08/20-12:39:40.746356) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.01, MB/sec: 22.1 rd, 20.0 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(19.8, 168.7 +0.0 blob) out(170.5 +0.0 blob), read-write-amplify(18.1) write-amplify(8.6) OK, records in: 372002, records dropped: 26641 output_compression: Snappy 2024/08/20-12:39:40.746465 140500565382720 (Original Log Time 2024/08/20-12:39:40.746416) EVENT_LOG_v1 {"time_micros": 1724128780746389, "cf": "default", "job": 30031, "event": "compaction_finished", "compaction_time_micros": 8942161, "compaction_time_cpu_micros": 1430550, "output_level": 3, "num_output_files": 2, "total_output_size": 178796806, "num_input_records": 372002, "num_output_records": 345361, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 154161272, "file_range_sync_nanos": 0, "file_fsync_nanos": 1560, "file_prepare_write_nanos": 7070, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-12:39:40.906830 140500565382720 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":1724128771,"executesMs":9139,"compactionJobId":30031,"attempt":0,"compactionInputRawBytes":252544662,"compactionInputZipBytes":197676691,"compactionOutputRawBytes":0,"compactionOutputZipBytes":178796806,"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-efd9fedf230aae5546893800275d0f7a-180e2c6791507e6c-00"}}, response = 2024/08/20-12:39:40.907141 140500565382720 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-30031/att-00: olev 3, work 9.139 s, result 6.330 ms, install 3.328 ms, input{raw 240.845 MiB zip 188.519 MiB}