2024/08/20-11:13:48.784434 140500246459968 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00: fork to child time = 0.041894 sec 2024/08/20-11:13:48.785853 140500246459968 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00 2024/08/20-11:13:48.791078 140500246459968 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00 2024/08/20-11:13:48.794837 140500246459968 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-11:13:48.795183 140500246459968 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-11:13:48.848624 140500246459968 [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-26111/att-00/MANIFEST-14629260 2024/08/20-11:13:48.862543 140500246459968 [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-26111/att-00/MANIFEST-14629260 succeeded,manifest_file_number is 14629260, next_file_number is 14659235, last_sequence is 190449752167, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14659077 2024/08/20-11:13:48.862551 140500246459968 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-11:13:48.862637 140500246459968 [version_set.cc:5652] Creating manifest 14659235 2024/08/20-11:13:48.898147 140500246459968 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-11:13:48.915565 140500246459968 [compaction_job.cc:2433] [default] [JOB 26111] Compacting 1@2 + 2@3 files to L3, score 0.96, subcompactions 1 : 1 2024/08/20-11:13:48.915583 140500246459968 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 13386 Base level 2, inputs: [14659212(18MB)], [14659148(97MB) 14659149(14MB)] 2024/08/20-11:13:49.103891 140500246459968 [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 2024/08/20-11:13:49.103913 140500246459968 [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 2024/08/20-11:13:49.103943 140500246459968 [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 2024/08/20-11:13:49.103966 140500246459968 [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 2024/08/20-11:13:49.103978 140500246459968 [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 2024/08/20-11:13:49.911474 140500246459968 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst) /dev/shm/ToplingTemp/Topling-320989-ZPADVQ 2024/08/20-11:13:50.448245 140500246459968 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst): first pass time = 0.54's, 250.076'MB/sec 2024/08/20-11:13:54.771884 140500246459968 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst): old prealloc_size = 147639500, real_size = 100121728 2024/08/20-11:13:54.772126 140500246459968 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 197740 prefix = 4 raw-key = 0.0024 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.95 raw-val = 0.1295 GB zip-val = 0.0997 GB avg-val = 654.76 avg-zval = 504.13 2024/08/20-11:13:54.772396 140500246459968 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0004 GB, waited 0.000 sec, Key+Value = 0.134 GB 2024/08/20-11:13:55.284398 140500246459968 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659236.sst): second pass time = 4.32's, 29.952'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.51's, 199.346'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1875.468'MB/sec (index lex order gen) rebuild zvType time = 0.39's, 0.126'MB/sec write SST data time = 0.12's, 846.466'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.349'MB, throughput = 25755.981'MB/sec zip my value time = 4.32's, unzip length = 0.129'GB zip my value throughput = 29.952'MB/sec zip pipeline throughput = 130.998'MB/sec entries = 197740 avg-key = 24.00 avg-zkey = 1.95 avg-val = 654.76 avg-zval = 504.13 usrkeys = 197740 avg-key = 16.00 avg-zkey = 1.95 avg-val = 661.76 avg-zval = 504.13 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 197740 bytes = 741536 } seq expand size = 1384180 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0032 GB value = 0.1295 GB dict = 1.35 MB all = 0.1342 GB } __ZipSize{ index = 0.0004 GB value = 0.0997 GB dict = 1.35 MB all = 0.1022 GB } UnZip/Zip{ index = 8.1941 value = 1.2988 dict = 1.00 all = 1.3137 } Zip/UnZip{ index = 0.1220 value = 0.7699 dict = 1.00 all = 0.7612 } ---------------------------- total value len = 62.427606 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 = 0.389531301 Billion total entry num = 0.346409309 Billion write speed all = 1.088483510 MB/sec (with seq num) write speed all = 1.044905957 MB/sec (without seq num) 2024/08/20-11:13:55.408058 140500246459968 [compaction_job.cc:1944] [default] [JOB 26111] Generated table #14659236: 197740 keys, 102165694 bytes, temperature: kWarm 2024/08/20-11:13:55.408164 140500246459968 EVENT_LOG_v1 {"time_micros": 1724123635408102, "cf_name": "default", "job": 26111, "event": "table_file_creation", "file_number": 14659236, "file_size": 102165694, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189648517461, "largest_seqno": 190449735630, "table_properties": {"data_size": 99686000, "index_size": 386112, "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": 4745760, "raw_average_key_size": 24, "raw_value_size": 129472145, "raw_average_value_size": 654, "num_data_blocks": 1, "num_entries": 197740, "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": 1724123629, "oldest_key_time": 0, "file_creation_time": 1724123629, "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": 14659236, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-11:13:55.505428 140500246459968 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst) /dev/shm/ToplingTemp/Topling-320989-eiZsTR 2024/08/20-11:13:55.734963 140500246459968 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst): first pass time = 0.23's, 95.770'MB/sec 2024/08/20-11:13:56.245717 140500246459968 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst): old prealloc_size = 147639500, real_size = 16682448 2024/08/20-11:13:56.245812 140500246459968 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 32351 prefix = 4 raw-key = 0.0004 GB zip-key = 0.0001 GB avg-key = 12.00 avg-zkey = 1.99 raw-val = 0.0212 GB zip-val = 0.0166 GB avg-val = 655.38 avg-zval = 513.43 2024/08/20-11:13:56.245881 140500246459968 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0001 GB, waited 0.000 sec, Key+Value = 0.022 GB 2024/08/20-11:13:56.302479 140500246459968 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00/14659237.sst): second pass time = 0.50's, 42.128'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.06's, 299.246'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 1204.179'MB/sec (index lex order gen) rebuild zvType time = 0.04's, 0.186'MB/sec write SST data time = 0.01's, 1284.989'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 0.206'MB, throughput = 3534.035'MB/sec zip my value time = 0.50's, unzip length = 0.021'GB zip my value throughput = 42.128'MB/sec zip pipeline throughput = 49.653'MB/sec entries = 32351 avg-key = 24.00 avg-zkey = 1.99 avg-val = 655.38 avg-zval = 513.43 usrkeys = 32351 avg-key = 16.00 avg-zkey = 1.99 avg-val = 662.38 avg-zval = 513.43 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 32351 bytes = 105152 } seq expand size = 226457 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0005 GB value = 0.0212 GB dict = 0.21 MB all = 0.0220 GB } __ZipSize{ index = 0.0001 GB value = 0.0166 GB dict = 0.21 MB all = 0.0170 GB } UnZip/Zip{ index = 8.0475 value = 1.2765 dict = 1.00 all = 1.2938 } Zip/UnZip{ index = 0.1243 value = 0.7834 dict = 1.00 all = 0.7729 } ---------------------------- total value len = 62.449035 GB avg = 0.180 KB (by entry num) total key len = 6.794280 GB avg = 0.020 KB total ukey len = 3.193189 GB avg = 0.008 KB total ukey num = 0.389563652 Billion total entry num = 0.346441660 Billion write speed all = 1.088815248 MB/sec (with seq num) write speed all = 1.045234323 MB/sec (without seq num) 2024/08/20-11:13:56.326093 140500246459968 [compaction_job.cc:1944] [default] [JOB 26111] Generated table #14659237: 32351 keys, 16987111 bytes, temperature: kWarm 2024/08/20-11:13:56.326166 140500246459968 EVENT_LOG_v1 {"time_micros": 1724123636326123, "cf_name": "default", "job": 26111, "event": "table_file_creation", "file_number": 14659237, "file_size": 16987111, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 190397579407, "largest_seqno": 190449735522, "table_properties": {"data_size": 16609856, "index_size": 64320, "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": 776424, "raw_average_key_size": 24, "raw_value_size": 21202183, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 32351, "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": 1724123635, "oldest_key_time": 0, "file_creation_time": 1724123635, "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": 14659237, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-11:13:56.341344 140500246459968 [compaction_job.cc:699] job-26111: subcompact[0], size: 0.119153 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-26111/att-00 [14659236,14659237] 2024/08/20-11:13:56.366240 140500246459968 (Original Log Time 2024/08/20-11:13:48.915656) EVENT_LOG_v1 {"time_micros": 1724123628915599, "job": 26111, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L2": [14659212], "files_L3": [14659148, 14659149], "score": 0.959278, "input_data_size": 136254531, "oldest_snapshot_seqno": 190449752058} 2024/08/20-11:13:56.366244 140500246459968 (Original Log Time 2024/08/20-11:13:56.365838) [compaction_job.cc:2018] [default] [JOB 26111] Compacted 1@2 + 2@3 files to L3 => 119152805 bytes 2024/08/20-11:13:56.366245 140500246459968 (Original Log Time 2024/08/20-11:13:56.366172) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 2 0 0 0] max score 0.00, MB/sec: 18.3 rd, 16.0 wr, level 3, files in(1, 2) out(2 +0 blob) MB in(18.4, 111.5 +0.0 blob) out(113.6 +0.0 blob), read-write-amplify(13.2) write-amplify(6.2) OK, records in: 253951, records dropped: 23860 output_compression: Snappy 2024/08/20-11:13:56.366252 140500246459968 (Original Log Time 2024/08/20-11:13:56.366217) EVENT_LOG_v1 {"time_micros": 1724123636366197, "cf": "default", "job": 26111, "event": "compaction_finished", "compaction_time_micros": 7425697, "compaction_time_cpu_micros": 978458, "output_level": 3, "num_output_files": 2, "total_output_size": 119152805, "num_input_records": 253951, "num_output_records": 230091, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 161315790, "file_range_sync_nanos": 0, "file_fsync_nanos": 1774, "file_prepare_write_nanos": 5340, "lsm_state": [0, 0, 0, 2, 0, 0, 0]} 2024/08/20-11:13:56.480742 140500246459968 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":1724123628,"executesMs":7576,"compactionJobId":26111,"attempt":0,"compactionInputRawBytes":172414310,"compactionInputZipBytes":136254531,"compactionOutputRawBytes":0,"compactionOutputZipBytes":119152805,"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-a8374ca35ab28d97f23945f0c29a75d2-56e04a9f40be1659-00"}}, response = 2024/08/20-11:13:56.480835 140500246459968 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-20T02.42.00/.rocksdb/job-26111/att-00: olev 3, work 7.576 s, result 4.849 ms, install 0.438 ms, input{raw 164.427 MiB zip 129.942 MiB}