2024/08/20-14:34:23.457018 140500590560832 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00: fork to child time = 0.022779 sec 2024/08/20-14:34:23.458006 140500590560832 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00 2024/08/20-14:34:23.463225 140500590560832 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00 2024/08/20-14:34:23.463567 140500590560832 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-14:34:23.463862 140500590560832 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-14:34:23.505326 140500590560832 [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-34786/att-00/MANIFEST-14629260 2024/08/20-14:34:23.518982 140500590560832 [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-34786/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14669343, last_sequence is 190665991651, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14669137 2024/08/20-14:34:23.518991 140500590560832 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-14:34:23.519047 140500590560832 [version_set.cc:5652] Creating manifest 14669343 2024/08/20-14:34:23.542828 140500590560832 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-14:34:23.555421 140500590560832 [compaction_job.cc:2433] [default] [JOB 34786] Compacting 1@2 + 2@3 files to L3, score 1.01, subcompactions 1 : 1 2024/08/20-14:34:23.555433 140500590560832 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 17777 Base level 2, inputs: [14669336(20MB)], [14669243(16MB) 14668925(37MB)] 2024/08/20-14:34:23.560575 140500590560832 [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 2024/08/20-14:34:23.560615 140500590560832 [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 2024/08/20-14:34:23.560655 140500590560832 [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 2024/08/20-14:34:23.560664 140500590560832 [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 2024/08/20-14:34:23.560673 140500590560832 [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 2024/08/20-14:34:23.829606 140500590560832 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst) /dev/shm/ToplingTemp/Topling-388415-YXpUdi 2024/08/20-14:34:24.678099 140500590560832 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst): first pass time = 0.85's, 158.194'MB/sec 2024/08/20-14:34:27.074435 140500590560832 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst): old prealloc_size = 85887915, real_size = 34418704 2024/08/20-14:34:27.075063 140500590560832 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 929940 prefix = 4 raw-key = 0.0149 GB zip-key = 0.0018 GB avg-key = 16.00 avg-zkey = 1.89 raw-val = 0.1082 GB zip-val = 0.0324 GB avg-val = 116.33 avg-zval = 34.87 2024/08/20-14:34:27.075889 140500590560832 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0023 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-14:34:27.957820 140500590560832 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669344.sst): second pass time = 2.39's, 45.171'MB/sec, value only(80.6% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.88's, 43.615'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2901.948'MB/sec (index lex order gen) rebuild zvType time = 0.64's, 0.365'MB/sec write SST data time = 0.25's, 156.391'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.079'MB, throughput = 25360.846'MB/sec zip my value time = 2.39's, unzip length = 0.108'GB zip my value throughput = 45.171'MB/sec zip pipeline throughput = 148.657'MB/sec entries = 929940 avg-key = 28.00 avg-zkey = 1.89 avg-val = 116.33 avg-zval = 34.87 usrkeys = 929940 avg-key = 20.00 avg-zkey = 1.89 avg-val = 123.33 avg-zval = 34.87 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 929940 bytes = 3254800 } seq expand size = 6509580 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0186 GB value = 0.1082 GB dict = 1.08 MB all = 0.1342 GB } __ZipSize{ index = 0.0018 GB value = 0.0324 GB dict = 1.08 MB all = 0.0385 GB } UnZip/Zip{ index = 10.5825 value = 3.3359 dict = 1.00 all = 3.4835 } Zip/UnZip{ index = 0.0945 value = 0.2998 dict = 1.00 all = 0.2871 } ---------------------------- total value len = 62.411439 GB avg = 0.180 KB (by entry num) total key len = 6.814796 GB avg = 0.020 KB total ukey len = 3.208106 GB avg = 0.008 KB total ukey num = 0.390263501 Billion total entry num = 0.347141509 Billion write speed all = 0.915366982 MB/sec (with seq num) write speed all = 0.878645427 MB/sec (without seq num) 2024/08/20-14:34:28.003906 140500590560832 [compaction_job.cc:1944] [default] [JOB 34786] Generated table #14669344: 929940 keys, 38529681 bytes, temperature: kWarm 2024/08/20-14:34:28.004001 140500590560832 EVENT_LOG_v1 {"time_micros": 1724135668003953, "cf_name": "default", "job": 34786, "event": "table_file_creation", "file_number": 14669344, "file_size": 38529681, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190456765166, "largest_seqno": 190665660984, "table_properties": {"data_size": 32428544, "index_size": 1757504, "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": 26038320, "raw_average_key_size": 28, "raw_value_size": 108179468, "raw_average_value_size": 116, "num_data_blocks": 1, "num_entries": 929940, "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": 1724135663, "oldest_key_time": 0, "file_creation_time": 1724135663, "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": 14669344, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-14:34:28.041247 140500590560832 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst) /dev/shm/ToplingTemp/Topling-388415-hKpONj 2024/08/20-14:34:28.640343 140500590560832 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst): first pass time = 0.60's, 186.071'MB/sec 2024/08/20-14:34:29.935260 140500590560832 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst): old prealloc_size = 85887915, real_size = 29687968 2024/08/20-14:34:29.935824 140500590560832 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 774067 prefix = 4 raw-key = 0.0124 GB zip-key = 0.0015 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.0898 GB zip-val = 0.0280 GB avg-val = 116.00 avg-zval = 36.20 2024/08/20-14:34:29.936536 140500590560832 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0019 GB, waited 0.000 sec, Key+Value = 0.111 GB 2024/08/20-14:34:30.563988 140500590560832 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00/14669345.sst): second pass time = 1.29's, 69.392'MB/sec, value only(80.6% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.63's, 52.505'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2738.818'MB/sec (index lex order gen) rebuild zvType time = 0.52's, 0.374'MB/sec write SST data time = 0.11's, 299.699'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.899'MB, throughput = 22839.205'MB/sec zip my value time = 1.29's, unzip length = 0.090'GB zip my value throughput = 69.392'MB/sec zip pipeline throughput = 69.392'MB/sec entries = 774067 avg-key = 28.00 avg-zkey = 1.90 avg-val = 116.00 avg-zval = 36.20 usrkeys = 774067 avg-key = 20.00 avg-zkey = 1.90 avg-val = 123.00 avg-zval = 36.20 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 774067 bytes = 2612496 } seq expand size = 5418469 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0155 GB value = 0.0898 GB dict = 0.90 MB all = 0.1115 GB } __ZipSize{ index = 0.0015 GB value = 0.0280 GB dict = 0.90 MB all = 0.0330 GB } UnZip/Zip{ index = 10.5099 value = 3.2045 dict = 1.00 all = 3.3766 } Zip/UnZip{ index = 0.0951 value = 0.3121 dict = 1.00 all = 0.2962 } ---------------------------- total value len = 62.506651 GB avg = 0.180 KB (by entry num) total key len = 6.836470 GB avg = 0.020 KB total ukey len = 3.223588 GB avg = 0.008 KB total ukey num = 0.391037568 Billion total entry num = 0.347915576 Billion write speed all = 0.916880944 MB/sec (with seq num) write speed all = 0.880078775 MB/sec (without seq num) 2024/08/20-14:34:30.604723 140500590560832 [compaction_job.cc:1944] [default] [JOB 34786] Generated table #14669345: 774067 keys, 33011265 bytes, temperature: kWarm 2024/08/20-14:34:30.604792 140500590560832 EVENT_LOG_v1 {"time_micros": 1724135670604758, "cf_name": "default", "job": 34786, "event": "table_file_creation", "file_number": 14669345, "file_size": 33011265, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190578675394, "largest_seqno": 190665661339, "table_properties": {"data_size": 28021264, "index_size": 1473024, "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": 21673876, "raw_average_key_size": 28, "raw_value_size": 89793274, "raw_average_value_size": 116, "num_data_blocks": 1, "num_entries": 774067, "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": 1724135668, "oldest_key_time": 0, "file_creation_time": 1724135668, "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": 14669345, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-14:34:30.625837 140500590560832 [compaction_job.cc:699] job-34786: subcompact[0], size: 0.071541 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-34786/att-00 [14669344,14669345] 2024/08/20-14:34:30.650730 140500590560832 (Original Log Time 2024/08/20-14:34:23.555490) EVENT_LOG_v1 {"time_micros": 1724135663555445, "job": 34786, "event": "compaction_started", "compaction_reason": "LevelMaxLevelSize", "files_L2": [14669336], "files_L3": [14669243, 14668925], "score": 1.00598, "input_data_size": 78079923, "oldest_snapshot_seqno": 190665991231} 2024/08/20-14:34:30.650735 140500590560832 (Original Log Time 2024/08/20-14:34:30.647563) [compaction_job.cc:2018] [default] [JOB 34786] Compacted 1@2 + 2@3 files to L3 => 71540946 bytes 2024/08/20-14:34:30.650736 140500590560832 (Original Log Time 2024/08/20-14:34:30.650660) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.00, MB/sec: 11.0 rd, 10.1 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(20.0, 54.4 +0.0 blob) out(68.2 +0.0 blob), read-write-amplify(7.1) write-amplify(3.4) OK, records in: 1792360, records dropped: 88353 output_compression: Snappy 2024/08/20-14:34:30.650744 140500590560832 (Original Log Time 2024/08/20-14:34:30.650705) EVENT_LOG_v1 {"time_micros": 1724135670650685, "cf": "default", "job": 34786, "event": "compaction_finished", "compaction_time_micros": 7070356, "compaction_time_cpu_micros": 2689410, "output_level": 3, "num_output_files": 2, "total_output_size": 71540946, "num_input_records": 1792360, "num_output_records": 1704007, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 45529557, "file_range_sync_nanos": 0, "file_fsync_nanos": 1352, "file_prepare_write_nanos": 6555, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-14:34:30.788143 140500590560832 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":1724135663,"executesMs":7184,"compactionJobId":34786,"attempt":0,"compactionInputRawBytes":258231064,"compactionInputZipBytes":78079923,"compactionOutputRawBytes":0,"compactionOutputZipBytes":71540946,"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":"00-23db930afae6db70278a357a6ccf0841-a9006140707173fa-00"}}, response = 2024/08/20-14:34:30.788246 140500590560832 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-34786/att-00: olev 3, work 7.184 s, result 6.194 ms, install 3.201 ms, input{raw 246.268 MiB zip 74.463 MiB}