2024/08/20-00:08:34.918593 140500598953536 DEBG dcompact_worker.cpp:2211: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00: fork to child time = 0.029122 sec 2024/08/20-00:08:34.919669 140500598953536 DEBG dcompact_worker.cpp:1011: Beg SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00 2024/08/20-00:08:34.925647 140500598953536 DEBG dcompact_worker.cpp:1031: End SerDeRead: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00 2024/08/20-00:08:34.939272 140500598953536 TRAC dcompact_worker.cpp:1081: INFO_LOG_LEVEL: rpc = INFO_LEVEL, env_var = undefined 2024/08/20-00:08:34.939739 140500598953536 [WARN] [column_family.cc:386] multiple cf_paths/db_paths and level_compaction_dynamic_level_bytes can't be used together 2024/08/20-00:08:34.984707 140500598953536 [version_set.cc:6139] Recovering from manifest file: /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-19T23.41.30/.rocksdb/job-01139/att-00/MANIFEST-14619535 2024/08/20-00:08:35.014545 140500598953536 [version_set.cc:6182] Recovered from manifest file:/worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-19T23.41.30/.rocksdb/job-01139/att-00/MANIFEST-14619535 succeeded,manifest_file_number is 14619535, next_file_number is 14620798, last_sequence is 189609762861, log_number is 0,prev_log_number is 0,max_column_family is 0,min_log_number_to_keep is 14620644 2024/08/20-00:08:35.014555 140500598953536 [version_set.cc:6197] Column family [default] (ID 0), log number is 0 2024/08/20-00:08:35.014655 140500598953536 [version_set.cc:5652] Creating manifest 14620798 2024/08/20-00:08:35.041756 140500598953536 DEBG dcompact_worker.cpp:1215: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00: bottommost_level: fake = 1, rpc = 0 2024/08/20-00:08:35.062902 140500598953536 [compaction_job.cc:2433] [default] [JOB 1139] Compacting 1@3 + 2@4 files to L4, score 0.98, subcompactions 1 : 1 2024/08/20-00:08:35.062932 140500598953536 [compaction_job.cc:2441] [default]: Compaction start summary: Base version 573 Base level 3, inputs: [14620770(21MB)], [14620741(193MB) 14620742(101MB)] 2024/08/20-00:08:35.273450 140500598953536 [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 2024/08/20-00:08:35.273476 140500598953536 [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 2024/08/20-00:08:35.273501 140500598953536 [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 2024/08/20-00:08:35.273524 140500598953536 [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 2024/08/20-00:08:35.273538 140500598953536 [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 2024/08/20-00:08:36.804591 140500598953536 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst) /dev/shm/ToplingTemp/Topling-68827-jhhjoB 2024/08/20-00:08:37.894883 140500598953536 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst): first pass time = 1.09's, 246.219'MB/sec 2024/08/20-00:08:45.937281 140500598953536 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst): old prealloc_size = 295279001, real_size = 199338896 2024/08/20-00:08:45.937586 140500598953536 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 395268 prefix = 4 raw-key = 0.0047 GB zip-key = 0.0007 GB avg-key = 12.00 avg-zkey = 1.80 raw-val = 0.2589 GB zip-val = 0.1985 GB avg-val = 655.12 avg-zval = 502.26 2024/08/20-00:08:45.938023 140500598953536 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst: sumWaitingMem = 0.001 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0009 GB, waited 0.000 sec, Key+Value = 0.268 GB 2024/08/20-00:08:46.486161 140500598953536 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620799.sst): second pass time = 8.04's, 32.206'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.55's, 370.325'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2745.358'MB/sec (index lex order gen) rebuild zvType time = 0.41's, 0.241'MB/sec write SST data time = 0.14's, 1468.639'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 2.636'MB, throughput = 55213.562'MB/sec zip my value time = 8.04's, unzip length = 0.259'GB zip my value throughput = 32.206'MB/sec zip pipeline throughput = 102.302'MB/sec entries = 395268 avg-key = 24.00 avg-zkey = 1.80 avg-val = 655.12 avg-zval = 502.26 usrkeys = 395268 avg-key = 16.00 avg-zkey = 1.80 avg-val = 662.12 avg-zval = 502.26 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 395268 bytes = 1383456 } seq expand size = 2766876 multi value expand size = 0 cnt WriteAppend = 13 UnZipSize{ index = 0.0063 GB value = 0.2589 GB dict = 2.64 MB all = 0.2684 GB } __ZipSize{ index = 0.0007 GB value = 0.1985 GB dict = 2.64 MB all = 0.2033 GB } UnZip/Zip{ index = 8.9000 value = 1.3043 dict = 1.00 all = 1.3206 } Zip/UnZip{ index = 0.1124 value = 0.7667 dict = 1.00 all = 0.7572 } ---------------------------- total value len = 62.558466 GB avg = 0.180 KB (by entry num) total key len = 6.798244 GB avg = 0.020 KB total ukey len = 3.195832 GB avg = 0.008 KB total ukey num = 0.389728829 Billion total entry num = 0.346606837 Billion write speed all = 2.928261732 MB/sec (with seq num) write speed all = 2.811190949 MB/sec (without seq num) 2024/08/20-00:08:46.714626 140500598953536 [compaction_job.cc:1944] [default] [JOB 1139] Generated table #14620799: 395268 keys, 203263634 bytes, temperature: kWarm 2024/08/20-00:08:46.714715 140500598953536 EVENT_LOG_v1 {"time_micros": 1724083726714666, "cf_name": "default", "job": 1139, "event": "table_file_creation", "file_number": 14620799, "file_size": 203263634, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189417716716, "largest_seqno": 189609692723, "table_properties": {"data_size": 198529280, "index_size": 710592, "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": 9486432, "raw_average_key_size": 24, "raw_value_size": 258949076, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 395268, "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": 1724083716, "oldest_key_time": 0, "file_creation_time": 1724083716, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "9474K4QZ2QA6TIYF9LEW", "orig_file_number": 14620799, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-00:08:46.777886 140500598953536 [top_zip_table_builder.cc:934] ToplingZipTableBuilder(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst) /dev/shm/ToplingTemp/Topling-68827-2AbRHy 2024/08/20-00:08:47.748306 140500598953536 [top_zip_table_builder.cc:1344] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst): first pass time = 0.97's, 146.594'MB/sec 2024/08/20-00:08:50.156420 140500598953536 [top_zip_table_builder.cc:2764] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst): old prealloc_size = 295279001, real_size = 106234016 2024/08/20-00:08:50.156622 140500598953536 [top_zip_table_builder.cc:1765] BuildReorderMap(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst): index type = NestLoudsTrieDAWG_Mixed_XL_256_32_FL, store type = DictZipBlobStore usrkeys = 209491 prefix = 4 raw-key = 0.0025 GB zip-key = 0.0004 GB avg-key = 12.00 avg-zkey = 1.81 raw-val = 0.1372 GB zip-val = 0.1058 GB avg-val = 655.02 avg-zval = 505.05 2024/08/20-00:08:50.156861 140500598953536 [top_zip_table_builder.cc:1295] /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst: sumWaitingMem = 0.000 GB, sumWorkingMem = 0.020 GB, reorder workingMem = 0.0005 GB, waited 0.000 sec, Key+Value = 0.142 GB 2024/08/20-00:08:50.555305 140500598953536 [top_zip_table_builder.cc:3092] ToplingZipTableBuilder::Finish(/storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00/14620800.sst): second pass time = 2.40's, 57.065'MB/sec, value only(96.5% of KV) wait indexing time = 0.00's, remap KeyValue time = 0.40's, 271.610'MB/sec (all stages of remap) Get OrderMap time = 0.00's, 2150.787'MB/sec (index lex order gen) rebuild zvType time = 0.32's, 0.165'MB/sec write SST data time = 0.08's, 1320.282'MB/sec dict compress time = 4356233619.02's, 0.000'MB/sec z-dict build time = 0.00's, sample length = 1.422'MB, throughput = 36546.370'MB/sec zip my value time = 2.40's, unzip length = 0.137'GB zip my value throughput = 57.065'MB/sec zip pipeline throughput = 67.500'MB/sec entries = 209491 avg-key = 24.00 avg-zkey = 1.81 avg-val = 655.02 avg-zval = 505.05 usrkeys = 209491 avg-key = 16.00 avg-zkey = 1.81 avg-val = 662.02 avg-zval = 505.05 TagRS{ kinds = RS_Key0_Tag1 bytes = 0 } TagArray{ size = 209491 bytes = 733232 } seq expand size = 1466437 multi value expand size = 0 cnt WriteAppend = 12 UnZipSize{ index = 0.0034 GB value = 0.1372 GB dict = 1.42 MB all = 0.1422 GB } __ZipSize{ index = 0.0004 GB value = 0.1058 GB dict = 1.42 MB all = 0.1083 GB } UnZip/Zip{ index = 8.8542 value = 1.2969 dict = 1.00 all = 1.3130 } Zip/UnZip{ index = 0.1129 value = 0.7710 dict = 1.00 all = 0.7616 } ---------------------------- total value len = 62.697152 GB avg = 0.181 KB (by entry num) total key len = 6.803272 GB avg = 0.020 KB total ukey len = 3.199184 GB avg = 0.008 KB total ukey num = 0.389938320 Billion total entry num = 0.346816328 Billion write speed all = 2.933825370 MB/sec (with seq num) write speed all = 2.816703951 MB/sec (without seq num) 2024/08/20-00:08:50.726429 140500598953536 [compaction_job.cc:1944] [default] [JOB 1139] Generated table #14620800: 209491 keys, 108340098 bytes, temperature: kWarm 2024/08/20-00:08:50.726524 140500598953536 EVENT_LOG_v1 {"time_micros": 1724083730726472, "cf_name": "default", "job": 1139, "event": "table_file_creation", "file_number": 14620800, "file_size": 108340098, "file_checksum": "", "file_checksum_func_name": "Unknown", "smallest_seqno": 189417702945, "largest_seqno": 189609692715, "table_properties": {"data_size": 105802896, "index_size": 378560, "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": 5027784, "raw_average_key_size": 24, "raw_value_size": 137220317, "raw_average_value_size": 655, "num_data_blocks": 1, "num_entries": 209491, "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": 1724083726, "oldest_key_time": 0, "file_creation_time": 1724083726, "slow_compression_estimated_data_size": 0, "fast_compression_estimated_data_size": 0, "db_id": "a007a635-5c0a-4b4a-be96-b9c695cb016b", "db_session_id": "9474K4QZ2QA6TIYF9LEW", "orig_file_number": 14620800, "seqno_to_time_mapping": "N/A", "__indexstats__": "[...1 records...]"}} 2024/08/20-00:08:50.784059 140500598953536 [compaction_job.cc:699] job-01139: subcompact[0], size: 0.311604 G, files: /storage/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/mytopling/.rocksdb/job-01139/att-00 [14620799,14620800] 2024/08/20-00:08:50.897221 140500598953536 (Original Log Time 2024/08/20-00:08:35.063022) EVENT_LOG_v1 {"time_micros": 1724083715062951, "job": 1139, "event": "compaction_started", "compaction_reason": "FilesMarkedForCompaction", "files_L3": [14620770], "files_L4": [14620741, 14620742], "score": 0.981818, "input_data_size": 331410784, "oldest_snapshot_seqno": 189609762367} 2024/08/20-00:08:50.897227 140500598953536 (Original Log Time 2024/08/20-00:08:50.893859) [compaction_job.cc:2018] [default] [JOB 1139] Compacted 1@3 + 2@4 files to L4 => 311603732 bytes 2024/08/20-00:08:50.897229 140500598953536 (Original Log Time 2024/08/20-00:08:50.897126) [compaction_job.cc:1220] [default] compacted to: files[0 0 0 0 2 0 0] max score 0.00, MB/sec: 21.1 rd, 19.8 wr, level 4, files in(1, 2) out(2 +0 blob) MB in(21.2, 294.9 +0.0 blob) out(297.2 +0.0 blob), read-write-amplify(29.0) write-amplify(14.0) OK, records in: 632365, records dropped: 27606 output_compression: Snappy 2024/08/20-00:08:50.897242 140500598953536 (Original Log Time 2024/08/20-00:08:50.897190) EVENT_LOG_v1 {"time_micros": 1724083730897163, "cf": "default", "job": 1139, "event": "compaction_finished", "compaction_time_micros": 15721053, "compaction_time_cpu_micros": 2288264, "output_level": 4, "num_output_files": 2, "total_output_size": 311603732, "num_input_records": 632365, "num_output_records": 604759, "num_subcompactions": 1, "output_compression": "Snappy", "num_single_delete_mismatches": 0, "num_single_delete_fallthrough": 0, "file_write_nanos": 185433391, "file_range_sync_nanos": 0, "file_fsync_nanos": 1377, "file_prepare_write_nanos": 5362, "lsm_state": [0, 0, 0, 0, 2, 0, 0]} 2024/08/20-00:08:51.025565 140500598953536 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":1724082090,"starts":1724083714,"executesMs":15968,"compactionJobId":1139,"attempt":0,"compactionInputRawBytes":429441777,"compactionInputZipBytes":331410784,"compactionOutputRawBytes":0,"compactionOutputZipBytes":311603732,"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":"00-5b591c58f92b250e665276c0821048c1-b58132bb94bc01e3-00"}}, response = 2024/08/20-00:08:51.025700 140500598953536 INFO dcompact_worker.cpp:1456: finish /worker/dcompact-log/nfs/i-wz9deglxdazgiryp6ltb_10.57.5.137/2024-08-19T23.41.30/.rocksdb/job-01139/att-00: olev 4, work 15.969 s, result 6.306 ms, install 3.462 ms, input{raw 409.548 MiB zip 316.058 MiB}