2024/07/08-19:13:26.889835 140064098809408 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00: fork to child time = 0.010442 sec 2024/07/08-19:13:26.890470 140064098809408 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00 2024/07/08-19:13:26.894876 140064098809408 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00 2024/07/08-19:13:26.896252 140064098809408 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/07/08-19:13:26.896521 140064098809408 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/07/08-19:13:26.935557 140064098809408 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-12463/att-00/MANIFEST-12625661 2024/07/08-19:13:26.986541 140064098809408 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-12463/att-00/MANIFEST-12625661 succeeded,manifest_file_number is 12625661, next_file_number is 12638650, last_sequence is 147458664332, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 12638561 2024/07/08-19:13:26.986554 140064098809408 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/07/08-19:13:26.986620 140064098809408 [version_set.cc:5652] Creating manifest 12638650 2024/07/08-19:13:27.012742 140064098809408 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00: bottommost_level: fake = 1, rpc = 0 2024/07/08-19:13:27.026497 140064098809408 [compaction_job.cc:2433] [default] [JOB 12463] Compacting 1@3 + 2@4 files to L4, score 1.01, subcompactions 1 : 1 2024/07/08-19:13:27.026509 140064098809408 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 6850 Base level 3, inputs: [12638640(37MB)], [12634216(36MB) 12634217(37MB)] 2024/07/08-19:13:27.033709 140064098809408 [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 2024/07/08-19:13:27.033749 140064098809408 [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 2024/07/08-19:13:27.033776 140064098809408 [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 2024/07/08-19:13:27.033785 140064098809408 [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 2024/07/08-19:13:27.033794 140064098809408 [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 2024/07/08-19:13:27.576443 140064098809408 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst) /dev/shm/ToplingTemp/Topling-11187-T3Rdk8 2024/07/08-19:13:29.079871 140064098809408 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst): first pass time = 1.50's, 178.556'MB/sec 2024/07/08-19:13:31.488753 140064098809408 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst): old prealloc_size = 128885870, real_size = 63548944 2024/07/08-19:13:31.489950 140064098809408 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 1847070 prefix = 4 raw-key = 0.0296 GB zip-key = 0.0035 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.2167 GB zip-val = 0.0596 GB avg-val = 117.33 avg-zval = 32.25 2024/07/08-19:13:31.492647 140064098809408 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst: sumWaitingMem = 0.005 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0048 GB, waited 0.000 sec, Key+Value = 0.268 GB 2024/07/08-19:13:33.009273 140064098809408 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638651.sst): second pass time = 2.41's, 90.013'MB/sec, value only(80.7% of KV) wait indexing time = 0.00's, remap KeyValue time = 1.52's, 47.321'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2977.130'MB/sec (index lex order gen) rebuild zvType time = 1.26's, 0.366'MB/sec write SST data time = 0.26's, 279.546'MB/sec dict compress time = 0.00's, 2159650.000'MB/sec z-dict build time = 0.00's, sample length = 2.160'MB, throughput = 49194.761'MB/sec zip my value time = 2.41's, unzip length = 0.217'GB zip my value throughput = 90.013'MB/sec zip pipeline throughput = 90.013'MB/sec entries = 1847070 avg-key = 28.00 avg-zkey = 1.90 avg-val = 117.33 avg-zval = 32.25 usrkeys = 1847070 avg-key = 20.00 avg-zkey = 1.90 avg-val = 124.33 avg-zval = 32.25 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 1847070 bytes = 6695648 } seq expand size = 12929490 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0369 GB value = 0.2167 GB dict = 2.16 MB all = 0.2684 GB } __ZipSize{ index = 0.0035 GB value = 0.0596 GB dict = 2.16 MB all = 0.0720 GB } UnZip/Zip{ index = 10.5173 value = 3.6378 dict = 1.00 all = 3.7307 } Zip/UnZip{ index = 0.0951 value = 0.2749 dict = 1.00 all = 0.2680 } ---------------------------- total value len = 0.229647 GB avg = 0.124 KB (by entry num) total key len = 0.051718 GB avg = 0.028 KB total ukey len = 0.036941 GB avg = 0.020 KB total ukey num = 0.001847070 Billion total entry num = 0.001847070 Billion write speed all = 0.237057744 MB/sec (with seq num) write speed all = 0.224608088 MB/sec (without seq num) 2024/07/08-19:13:33.090990 140064098809408 [compaction_job.cc:1944] [default] [JOB 12463] Generated table #12638651: 1847070 keys, 71952885 bytes, temperature: kWarm 2024/07/08-19:13:33.091076 140064098809408 EVENT_LOG_v1 {"time_micros": 1720437213091029, "cf_name": "default", "job": 12463, "event": "table_file_creation", "file_number": 12638651, "file_size": 71952885, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 147180688693, "largest_seqno": 147458209282, "table_properties": {"data_size": 59574528, "index_size": 3512448, "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": 51717960, "raw_average_key_size": 28, "raw_value_size": 216717584, "raw_average_value_size": 117, "num_data_blocks": 1, "num_entries": 1847070, "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": 1720437207, "oldest_key_time": 0, "file_creation_time": 1720437207, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "465QC0QPK7Q93426EREI", "orig_file_number": 12638651, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/08-19:13:33.137968 140064098809408 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst) /dev/shm/ToplingTemp/Topling-11187-IqHre8 2024/07/08-19:13:33.592207 140064098809408 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst): first pass time = 0.45's, 247.445'MB/sec 2024/07/08-19:13:34.775927 140064098809408 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst): old prealloc_size = 128885870, real_size = 28476832 2024/07/08-19:13:34.776446 140064098809408 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 771109 prefix = 4 raw-key = 0.0123 GB zip-key = 0.0015 GB avg-key = 16.00 avg-zkey = 1.90 raw-val = 0.0908 GB zip-val = 0.0268 GB avg-val = 117.75 avg-zval = 34.78 2024/07/08-19:13:34.777136 140064098809408 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst: sumWaitingMem = 0.002 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0019 GB, waited 0.000 sec, Key+Value = 0.112 GB 2024/07/08-19:13:35.418072 140064098809408 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00/12638652.sst): second pass time = 1.18's, 76.761'MB/sec, value only(80.8% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.64's, 49.822'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 3050.896'MB/sec (index lex order gen) rebuild zvType time = 0.53's, 0.362'MB/sec write SST data time = 0.11's, 294.907'MB/sec dict compress time = 0.00's, 908160.000'MB/sec z-dict build time = 0.00's, sample length = 0.908'MB, throughput = 18731.128'MB/sec zip my value time = 1.18's, unzip length = 0.091'GB zip my value throughput = 76.761'MB/sec zip pipeline throughput = 76.761'MB/sec entries = 771109 avg-key = 28.00 avg-zkey = 1.90 avg-val = 117.75 avg-zval = 34.78 usrkeys = 771109 avg-key = 20.00 avg-zkey = 1.90 avg-val = 124.75 avg-zval = 34.78 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 771109 bytes = 2795280 } seq expand size = 5397763 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0154 GB value = 0.0908 GB dict = 0.91 MB all = 0.1124 GB } __ZipSize{ index = 0.0015 GB value = 0.0268 GB dict = 0.91 MB all = 0.0320 GB } UnZip/Zip{ index = 10.5127 value = 3.3859 dict = 1.00 all = 3.5130 } Zip/UnZip{ index = 0.0951 value = 0.2953 dict = 1.00 all = 0.2847 } ---------------------------- total value len = 0.325844 GB avg = 0.124 KB (by entry num) total key len = 0.073309 GB avg = 0.028 KB total ukey len = 0.052364 GB avg = 0.020 KB total ukey num = 0.002618179 Billion total entry num = 0.002618179 Billion write speed all = 0.335616059 MB/sec (with seq num) write speed all = 0.318004701 MB/sec (without seq num) 2024/07/08-19:13:35.459998 140064098809408 [compaction_job.cc:1944] [default] [JOB 12463] Generated table #12638652: 771109 keys, 31992529 bytes, temperature: kWarm 2024/07/08-19:13:35.460071 140064098809408 EVENT_LOG_v1 {"time_micros": 1720437215460035, "cf_name": "default", "job": 12463, "event": "table_file_creation", "file_number": 12638652, "file_size": 31992529, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 147180688726, "largest_seqno": 147458208808, "table_properties": {"data_size": 26816848, "index_size": 1467008, "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": 21591052, "raw_average_key_size": 28, "raw_value_size": 90798978, "raw_average_value_size": 117, "num_data_blocks": 1, "num_entries": 771109, "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": 1720437213, "oldest_key_time": 0, "file_creation_time": 1720437213, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "465QC0QPK7Q93426EREI", "orig_file_number": 12638652, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/08-19:13:35.479289 140064098809408 [compaction_job.cc:699] job-12463: subcompact[0], size: 0.103945 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-12463/att-00 [12638651,12638652] 2024/07/08-19:13:35.502489 140064098809408 (Original Log Time 2024/07/08-19:13:27.026566) EVENT_LOG_v1 {"time_micros": 1720437207026523, "job": 12463, "event": "compaction_started", "compaction_reason": "LevelMaxLevelSize", "files_L3": [12638640], "files_L4": [12634216, 12634217], "score": 1.01047, "input_data_size": 117168973, "oldest_snapshot_seqno": 147458664005} 2024/07/08-19:13:35.502493 140064098809408 (Original Log Time 2024/07/08-19:13:35.502095) [compaction_job.cc:2018] [default] [JOB 12463] Compacted 1@3 + 2@4 files to L4 => 103945414 bytes 2024/07/08-19:13:35.502495 140064098809408 (Original Log Time 2024/07/08-19:13:35.502423) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 0 2 0 0] max score 0.00, MB/sec: 13.9 rd, 12.3 wr, level 4, files in(1, 2) out(2 +0 blob) MB in(37.7, 74.1 +0.0 blob) out(99.1 +0.0 blob), read-write-amplify(5.6) write-amplify(2.6) OK, records in: 2771897, records dropped: 153718 output_compression: Snappy 2024/07/08-19:13:35.502501 140064098809408 (Original Log Time 2024/07/08-19:13:35.502466) EVENT_LOG_v1 {"time_micros": 1720437215502448, "cf": "default", "job": 12463, "event": "compaction_finished", "compaction_time_micros": 8452731, "compaction_time_cpu_micros": 3803387, "output_level": 4, "num_output_files": 2, "total_output_size": 103945414, "num_input_records": 2771897, "num_output_records": 2618179, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 63403143, "file_range_sync_nanos": 0, "file_fsync_nanos": 1534, "file_prepare_write_nanos": 8112, "lsm_state": [0, 0, 0, 0, 2, 0, 0]} 2024/07/08-19:13:35.622811 140064098809408 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":1720420896,"starts":1720437206,"executesMs":8605,"compactionJobId":12463,"attempt":0,"compactionInputRawBytes":402653530,"compactionInputZipBytes":117168973,"compactionOutputRawBytes":0,"compactionOutputZipBytes":103945414,"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":"00-244a4195311572d148f2039a5ac624c2-4ffd49b1e42c865d-00"}}, response = 2024/07/08-19:13:35.622909 140064098809408 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-08T14.41.36/.rocksdb/job-12463/att-00: olev 4, work 8.606 s, result 6.468 ms, install 0.429 ms, input{raw 384.000 MiB zip 111.741 MiB}