2024/09/08-18:42:51.198092 140334344033856 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00: fork to child time = 0.009158 sec 2024/09/08-18:42:51.198739 140334344033856 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00 2024/09/08-18:42:51.203321 140334344033856 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00 2024/09/08-18:42:51.204724 140334344033856 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/09/08-18:42:51.205004 140334344033856 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/09/08-18:42:51.244805 140334344033856 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-09-08T18.40.49/.rocksdb/job-00196/att-00/MANIFEST-14705022 2024/09/08-18:42:51.283347 140334344033856 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-09-08T18.40.49/.rocksdb/job-00196/att-00/MANIFEST-14705022 succeeded,manifest_file_number is 14705022, next_file_number is 14705251, last_sequence is 191448537223, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14705017 2024/09/08-18:42:51.283360 140334344033856 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/09/08-18:42:51.283434 140334344033856 [version_set.cc:5652] Creating manifest 14705251 2024/09/08-18:42:51.309990 140334344033856 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00: bottommost_level: fake = 1, rpc = 0 2024/09/08-18:42:51.323722 140334344033856 [compaction_job.cc:2433] [default] [JOB 196] Compacting 1@2 + 2@3 files to L3, score 1.07, subcompactions 1 : 1 2024/09/08-18:42:51.323742 140334344033856 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 107 Base level 2, inputs: [14705247(21MB)], [14702394(36MB) 14702395(16MB)] 2024/09/08-18:42:51.328822 140334344033856 [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 2024/09/08-18:42:51.328865 140334344033856 [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 2024/09/08-18:42:51.328894 140334344033856 [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 2024/09/08-18:42:51.328904 140334344033856 [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 2024/09/08-18:42:51.328913 140334344033856 [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 2024/09/08-18:42:51.729704 140334344033856 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst) /dev/shm/ToplingTemp/Topling-8561-YxJ01x 2024/09/08-18:42:52.467967 140334344033856 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst): first pass time = 0.74's, 181.818'MB/sec 2024/09/08-18:42:54.679807 140334344033856 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst): old prealloc_size = 85790961, real_size = 33692704 2024/09/08-18:42:54.680411 140334344033856 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 935411 prefix = 4 raw-key = 0.0150 GB zip-key = 0.0018 GB avg-key = 16.00 avg-zkey = 1.92 raw-val = 0.1080 GB zip-val = 0.0317 GB avg-val = 115.49 avg-zval = 33.85 2024/09/08-18:42:54.681267 140334344033856 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0023 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/09/08-18:42:55.477304 140334344033856 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705252.sst): second pass time = 2.21's, 48.862'MB/sec, value only(80.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.80's, 47.418'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 3087.789'MB/sec (index lex order gen) rebuild zvType time = 0.66's, 0.353'MB/sec write SST data time = 0.14's, 279.574'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.078'MB, throughput = 27438.698'MB/sec zip my value time = 2.21's, unzip length = 0.108'GB zip my value throughput = 48.862'MB/sec zip pipeline throughput = 142.339'MB/sec entries = 935411 avg-key = 28.00 avg-zkey = 1.92 avg-val = 115.49 avg-zval = 33.85 usrkeys = 935411 avg-key = 20.00 avg-zkey = 1.92 avg-val = 122.49 avg-zval = 33.85 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 935411 bytes = 3273952 } seq expand size = 6547877 multi value expand size = 0 cnt WriteAppend = 14 UnZipSize{ index = 0.0187 GB value = 0.1080 GB dict = 1.08 MB all = 0.1342 GB } __ZipSize{ index = 0.0018 GB value = 0.0317 GB dict = 1.08 MB all = 0.0378 GB } UnZip/Zip{ index = 10.4432 value = 3.4113 dict = 1.00 all = 3.5492 } Zip/UnZip{ index = 0.0958 value = 0.2931 dict = 1.00 all = 0.2818 } ---------------------------- total value len = 0.114574 GB avg = 0.122 KB (by entry num) total key len = 0.026192 GB avg = 0.028 KB total ukey len = 0.018708 GB avg = 0.020 KB total ukey num = 0.000935411 Billion total entry num = 0.000935411 Billion write speed all = 0.006732178 MB/sec (with seq num) write speed all = 0.006374287 MB/sec (without seq num) 2024/09/08-18:42:55.527796 140334344033856 [compaction_job.cc:1944] [default] [JOB 196] Generated table #14705252: 935411 keys, 37816241 bytes, temperature: kWarm 2024/09/08-18:42:55.527882 140334344033856 EVENT_LOG_v1 {"time_micros": 1725792175527832, "cf_name": "default", "job": 196, "event": "table_file_creation", "file_number": 14705252, "file_size": 37816241, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 191240343171, "largest_seqno": 191400371437, "table_properties": {"data_size": 31667216, "index_size": 1791424, "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": 26191508, "raw_average_key_size": 28, "raw_value_size": 108026310, "raw_average_value_size": 115, "num_data_blocks": 1, "num_entries": 935411, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 28, "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": 1725792171, "oldest_key_time": 0, "file_creation_time": 1725792171, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "J36RAWAWW5D2UOPL8TAE", "orig_file_number": 14705252, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/09/08-18:42:55.558395 140334344033856 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst) /dev/shm/ToplingTemp/Topling-8561-RoNBmz 2024/09/08-18:42:56.172503 140334344033856 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst): first pass time = 0.61's, 201.964'MB/sec 2024/09/08-18:42:57.700977 140334344033856 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst): old prealloc_size = 85790961, real_size = 34764000 2024/09/08-18:42:57.701525 140334344033856 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 857872 prefix = 4 raw-key = 0.0137 GB zip-key = 0.0016 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.1000 GB zip-val = 0.0329 GB avg-val = 116.56 avg-zval = 38.37 2024/09/08-18:42:57.702542 140334344033856 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0021 GB, waited 0.000 sec, Key+Value = 0.124 GB 2024/09/08-18:42:58.382448 140334344033856 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00/14705253.sst): second pass time = 1.53's, 65.462'MB/sec, value only(80.6% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.68's, 56.744'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 3196.792'MB/sec (index lex order gen) rebuild zvType time = 0.56's, 0.383'MB/sec write SST data time = 0.12's, 320.086'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.001'MB, throughput = 19874.528'MB/sec zip my value time = 1.53's, unzip length = 0.100'GB zip my value throughput = 65.462'MB/sec zip pipeline throughput = 67.614'MB/sec entries = 857872 avg-key = 28.00 avg-zkey = 1.90 avg-val = 116.56 avg-zval = 38.37 usrkeys = 857872 avg-key = 20.00 avg-zkey = 1.90 avg-val = 123.56 avg-zval = 38.37 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 857872 bytes = 3109808 } seq expand size = 6005104 multi value expand size = 0 cnt WriteAppend = 15 UnZipSize{ index = 0.0172 GB value = 0.1000 GB dict = 1.00 MB all = 0.1240 GB } __ZipSize{ index = 0.0016 GB value = 0.0329 GB dict = 1.00 MB all = 0.0387 GB } UnZip/Zip{ index = 10.5086 value = 3.0379 dict = 1.00 all = 3.2071 } Zip/UnZip{ index = 0.0952 value = 0.3292 dict = 1.00 all = 0.3118 } ---------------------------- total value len = 0.220575 GB avg = 0.123 KB (by entry num) total key len = 0.050212 GB avg = 0.028 KB total ukey len = 0.035866 GB avg = 0.020 KB total ukey num = 0.001793283 Billion total entry num = 0.001793283 Billion write speed all = 0.012948708 MB/sec (with seq num) write speed all = 0.012262687 MB/sec (without seq num) 2024/09/08-18:42:58.430576 140334344033856 [compaction_job.cc:1944] [default] [JOB 196] Generated table #14705253: 857872 keys, 38669257 bytes, temperature: kWarm 2024/09/08-18:42:58.430645 140334344033856 EVENT_LOG_v1 {"time_micros": 1725792178430610, "cf_name": "default", "job": 196, "event": "table_file_creation", "file_number": 14705253, "file_size": 38669257, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 191152445321, "largest_seqno": 191446714222, "table_properties": {"data_size": 32916624, "index_size": 1632704, "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": 24020416, "raw_average_key_size": 28, "raw_value_size": 99995904, "raw_average_value_size": 116, "num_data_blocks": 1, "num_entries": 857872, "num_filter_entries": 0, "num_deletions": 0, "num_merge_operands": 0, "num_range_deletions": 0, "format_version": 0, "fixed_key_len": 28, "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": 1725792175, "oldest_key_time": 0, "file_creation_time": 1725792175, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "J36RAWAWW5D2UOPL8TAE", "orig_file_number": 14705253, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/09/08-18:42:58.450250 140334344033856 [compaction_job.cc:699] job-00196: subcompact[0], size: 0.076485 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-00196/att-00 [14705252,14705253] 2024/09/08-18:42:58.752451 140334344033856 (Original Log Time 2024/09/08-18:42:51.323825) EVENT_LOG_v1 {"time_micros": 1725792171323763, "job": 196, "event": "compaction_started", "compaction_reason": "LevelMaxLevelSize", "files_L2": [14705247], "files_L3": [14702394, 14702395], "score": 1.07209, "input_data_size": 77991783, "oldest_snapshot_seqno": 191448537054} 2024/09/08-18:42:58.752455 140334344033856 (Original Log Time 2024/09/08-18:42:58.746455) [compaction_job.cc:2018] [default] [JOB 196] Compacted 1@2 + 2@3 files to L3 => 76485498 bytes 2024/09/08-18:42:58.752456 140334344033856 (Original Log Time 2024/09/08-18:42:58.752384) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.00, MB/sec: 10.9 rd, 10.7 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(21.4, 52.9 +0.0 blob) out(72.9 +0.0 blob), read-write-amplify(6.9) write-amplify(3.4) OK, records in: 1811002, records dropped: 17719 output_compression: Snappy 2024/09/08-18:42:58.752464 140334344033856 (Original Log Time 2024/09/08-18:42:58.752430) EVENT_LOG_v1 {"time_micros": 1725792178752411, "cf": "default", "job": 196, "event": "compaction_finished", "compaction_time_micros": 7126436, "compaction_time_cpu_micros": 2724098, "output_level": 3, "num_output_files": 2, "total_output_size": 76485498, "num_input_records": 1811002, "num_output_records": 1793283, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 48522367, "file_range_sync_nanos": 0, "file_fsync_nanos": 1620, "file_prepare_write_nanos": 7410, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/09/08-18:42:58.867930 140334344033856 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":1725792049,"starts":1725792171,"executesMs":7543,"compactionJobId":196,"attempt":0,"compactionInputRawBytes":260750236,"compactionInputZipBytes":77991783,"compactionOutputRawBytes":0,"compactionOutputZipBytes":76485498,"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":"00-2369bf0d1802c8dd55bb7564210fe98a-0ff7be3cee3d1b11-00"}}, response = 2024/09/08-18:42:58.868033 140334344033856 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-09-08T18.40.49/.rocksdb/job-00196/att-00: olev 3, work 7.543 s, result 4.870 ms, install 6.034 ms, input{raw 248.671 MiB zip 74.379 MiB}