2024/07/25-04:49:29.986460 140495526897216 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00: fork to child time = 0.011988 sec 2024/07/25-04:49:29.987205 140495526897216 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00 2024/07/25-04:49:29.991399 140495526897216 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00 2024/07/25-04:49:29.992287 140495526897216 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/07/25-04:49:29.992545 140495526897216 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/07/25-04:49:30.031862 140495526897216 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-23T15.41.52/.rocksdb/job-54330/att-00/MANIFEST-13366722 2024/07/25-04:49:30.090122 140495526897216 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-23T15.41.52/.rocksdb/job-54330/att-00/MANIFEST-13366722 succeeded,manifest_file_number is 13366722, next_file_number is 13432768, last_sequence is 164606779714, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 13432584 2024/07/25-04:49:30.090135 140495526897216 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/07/25-04:49:30.090200 140495526897216 [version_set.cc:5652] Creating manifest 13432768 2024/07/25-04:49:30.118110 140495526897216 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00: bottommost_level: fake = 1, rpc = 0 2024/07/25-04:49:30.142005 140495526897216 [compaction_job.cc:2433] [default] [JOB 54330] Compacting 1@1 + 2@2 files to L2, score 0.99, subcompactions 1 : 1 2024/07/25-04:49:30.142016 140495526897216 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 28615 Base level 1, inputs: [13432714(6788KB)], [13432766(20MB) 13432739(12MB)] 2024/07/25-04:49:30.205671 140495526897216 [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 2024/07/25-04:49:30.205686 140495526897216 [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 2024/07/25-04:49:30.205700 140495526897216 [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 2024/07/25-04:49:30.205709 140495526897216 [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 2024/07/25-04:49:30.205717 140495526897216 [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 2024/07/25-04:49:30.372984 140495526897216 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst) /dev/shm/ToplingTemp/Topling-140792-Pk0TBd 2024/07/25-04:49:30.669430 140495526897216 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst): first pass time = 0.30's, 226.419'MB/sec 2024/07/25-04:49:31.945762 140495526897216 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst): old prealloc_size = 45631511, real_size = 19491840 2024/07/25-04:49:31.946146 140495526897216 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 466569 prefix = 4 raw-key = 0.0075 GB zip-key = 0.0009 GB avg-key = 16.00 avg-zkey = 1.89 raw-val = 0.0540 GB zip-val = 0.0185 GB avg-val = 115.83 avg-zval = 39.63 2024/07/25-04:49:31.946605 140495526897216 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst: sumWaitingMem = 0.001 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0011 GB, waited 0.000 sec, Key+Value = 0.067 GB 2024/07/25-04:49:32.817432 140495526897216 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432769.sst): second pass time = 1.28's, 42.377'MB/sec, value only(80.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.87's, 24.596'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2461.031'MB/sec (index lex order gen) rebuild zvType time = 0.69's, 0.169'MB/sec write SST data time = 0.18's, 117.327'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.542'MB, throughput = 19004.555'MB/sec zip my value time = 1.28's, unzip length = 0.054'GB zip my value throughput = 42.377'MB/sec zip pipeline throughput = 79.233'MB/sec entries = 466569 avg-key = 28.00 avg-zkey = 1.89 avg-val = 115.83 avg-zval = 39.63 usrkeys = 466569 avg-key = 20.00 avg-zkey = 1.89 avg-val = 122.83 avg-zval = 39.63 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 466569 bytes = 1516368 } seq expand size = 3265983 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0093 GB value = 0.0540 GB dict = 0.54 MB all = 0.0671 GB } __ZipSize{ index = 0.0009 GB value = 0.0185 GB dict = 0.54 MB all = 0.0214 GB } UnZip/Zip{ index = 10.5723 value = 2.9226 dict = 1.00 all = 3.1302 } Zip/UnZip{ index = 0.0946 value = 0.3422 dict = 1.00 all = 0.3195 } ---------------------------- total value len = 0.057311 GB avg = 0.123 KB (by entry num) total key len = 0.013064 GB avg = 0.028 KB total ukey len = 0.009331 GB avg = 0.020 KB total ukey num = 0.000466569 Billion total entry num = 0.000466569 Billion write speed all = 0.001566717 MB/sec (with seq num) write speed all = 0.001483622 MB/sec (without seq num) 2024/07/25-04:49:32.847947 140495526897216 [compaction_job.cc:1944] [default] [JOB 54330] Generated table #13432769: 466569 keys, 21439366 bytes, temperature: kWarm 2024/07/25-04:49:32.848068 140495526897216 EVENT_LOG_v1 {"time_micros": 1721854172847990, "cf_name": "default", "job": 54330, "event": "table_file_creation", "file_number": 13432769, "file_size": 21439366, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 164549364065, "largest_seqno": 164606508724, "table_properties": {"data_size": 18492400, "index_size": 882624, "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": 13063932, "raw_average_key_size": 28, "raw_value_size": 54044982, "raw_average_value_size": 115, "num_data_blocks": 1, "num_entries": 466569, "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": 1721854170, "oldest_key_time": 0, "file_creation_time": 1721854170, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "FDMKK73D6HWPO0XETTGC", "orig_file_number": 13432769, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/25-04:49:32.881308 140495526897216 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst) /dev/shm/ToplingTemp/Topling-140792-J7jDkd 2024/07/25-04:49:33.527067 140495526897216 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst): first pass time = 0.65's, 72.904'MB/sec 2024/07/25-04:49:34.539631 140495526897216 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst): old prealloc_size = 45631511, real_size = 13800368 2024/07/25-04:49:34.540219 140495526897216 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 328140 prefix = 4 raw-key = 0.0053 GB zip-key = 0.0006 GB avg-key = 16.00 avg-zkey = 1.93 raw-val = 0.0379 GB zip-val = 0.0131 GB avg-val = 115.46 avg-zval = 39.87 2024/07/25-04:49:34.540506 140495526897216 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst: sumWaitingMem = 0.001 GB, sumWorkingMem = 0.000 GB, reorder workingMem = 0.0008 GB, waited 0.000 sec, Key+Value = 0.047 GB 2024/07/25-04:49:34.941987 140495526897216 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00/13432770.sst): second pass time = 1.01's, 37.441'MB/sec, value only(80.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.40's, 37.728'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1117.285'MB/sec (index lex order gen) rebuild zvType time = 0.32's, 0.257'MB/sec write SST data time = 0.08's, 184.273'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.389'MB, throughput = 11197.777'MB/sec zip my value time = 1.01's, unzip length = 0.038'GB zip my value throughput = 37.441'MB/sec zip pipeline throughput = 105.862'MB/sec entries = 328140 avg-key = 28.00 avg-zkey = 1.93 avg-val = 115.46 avg-zval = 39.87 usrkeys = 328140 avg-key = 20.00 avg-zkey = 1.93 avg-val = 122.46 avg-zval = 39.87 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 328140 bytes = 1066464 } seq expand size = 2296980 multi value expand size = 0 cnt WriteAppend = 15 UnZipSize{ index = 0.0066 GB value = 0.0379 GB dict = 0.39 MB all = 0.0471 GB } __ZipSize{ index = 0.0006 GB value = 0.0131 GB dict = 0.39 MB all = 0.0152 GB } UnZip/Zip{ index = 10.3580 value = 2.8955 dict = 1.00 all = 3.1014 } Zip/UnZip{ index = 0.0965 value = 0.3454 dict = 1.00 all = 0.3224 } ---------------------------- total value len = 0.097494 GB avg = 0.123 KB (by entry num) total key len = 0.022252 GB avg = 0.028 KB total ukey len = 0.015894 GB avg = 0.020 KB total ukey num = 0.000794709 Billion total entry num = 0.000794709 Billion write speed all = 0.002665711 MB/sec (with seq num) write speed all = 0.002524180 MB/sec (without seq num) 2024/07/25-04:49:34.966594 140495526897216 [compaction_job.cc:1944] [default] [JOB 54330] Generated table #13432770: 328140 keys, 15178182 bytes, temperature: kWarm 2024/07/25-04:49:34.966680 140495526897216 EVENT_LOG_v1 {"time_micros": 1721854174966633, "cf_name": "default", "job": 54330, "event": "table_file_creation", "file_number": 13432770, "file_size": 15178182, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 164549364799, "largest_seqno": 164606507981, "table_properties": {"data_size": 13084576, "index_size": 633600, "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": 9187920, "raw_average_key_size": 28, "raw_value_size": 37886100, "raw_average_value_size": 115, "num_data_blocks": 1, "num_entries": 328140, "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": 1721854172, "oldest_key_time": 0, "file_creation_time": 1721854172, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "FDMKK73D6HWPO0XETTGC", "orig_file_number": 13432770, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/07/25-04:49:34.982933 140495526897216 [compaction_job.cc:699] job-54330: subcompact[0], size: 0.036618 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-54330/att-00 [13432769,13432770] 2024/07/25-04:49:35.011478 140495526897216 (Original Log Time 2024/07/25-04:49:30.142066) EVENT_LOG_v1 {"time_micros": 1721854170142025, "job": 54330, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L1": [13432714], "files_L2": [13432766, 13432739], "score": 0.986192, "input_data_size": 41483192, "oldest_snapshot_seqno": 164606778966} 2024/07/25-04:49:35.011483 140495526897216 (Original Log Time 2024/07/25-04:49:35.007805) [compaction_job.cc:2018] [default] [JOB 54330] Compacted 1@1 + 2@2 files to L2 => 36617548 bytes 2024/07/25-04:49:35.011486 140495526897216 (Original Log Time 2024/07/25-04:49:35.011399) [compaction_job.cc:1220] [default] compacted to: files[0 0 2 0 0 0 0] max score 0.01, MB/sec: 8.6 rd, 7.6 wr, level 2, files in(1, 2) out(2 +0 blob) MB in(6.6, 32.9 +0.0 blob) out(34.9 +0.0 blob), read-write-amplify(11.2) write-amplify(5.3) OK, records in: 794709, records dropped: 0 output_compression: Snappy 2024/07/25-04:49:35.011497 140495526897216 (Original Log Time 2024/07/25-04:49:35.011457) EVENT_LOG_v1 {"time_micros": 1721854175011430, "cf": "default", "job": 54330, "event": "compaction_finished", "compaction_time_micros": 4840875, "compaction_time_cpu_micros": 1701385, "output_level": 2, "num_output_files": 2, "total_output_size": 36617548, "num_input_records": 794709, "num_output_records": 794709, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 49470750, "file_range_sync_nanos": 0, "file_fsync_nanos": 2152, "file_prepare_write_nanos": 5932, "lsm_state": [0, 0, 2, 0, 0, 0, 0]} 2024/07/25-04:49:35.145741 140495526897216 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":1721720512,"starts":1721854169,"executesMs":5014,"compactionJobId":54330,"attempt":0,"compactionInputRawBytes":114182934,"compactionInputZipBytes":41483192,"compactionOutputRawBytes":0,"compactionOutputZipBytes":36617548,"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":"00-692c99c12323d19c03072dbd2598146c-f177cb2e5d231cfd-00"}}, response = 2024/07/25-04:49:35.145843 140495526897216 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-07-23T15.41.52/.rocksdb/job-54330/att-00: olev 2, work 5.014 s, result 7.053 ms, install 3.714 ms, input{raw 108.893 MiB zip 39.561 MiB}